期刊文献+
共找到165篇文章
< 1 2 9 >
每页显示 20 50 100
Microstructure and Mechanical Properties of Hyper-eutectic Al-Si Alloys Fabricated by Spray Casting 被引量:1
1
作者 Min Ryou Chul-Hyun Kim Myung-Ho Kim 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第1期48-50,共3页
Microstructure and mechanical properties of hyper-eutectic Al-Si alloy fabricated by spray casting were in- vestigated and then these results were compared with those by squeeze cast.The spray-cast specimen was found ... Microstructure and mechanical properties of hyper-eutectic Al-Si alloy fabricated by spray casting were in- vestigated and then these results were compared with those by squeeze cast.The spray-cast specimen was found to have finer Si particles (~5μm) compared to the squeeze-cast specimen (10-25μm).The tensile strength and elongation of the spray-cast specimen are also higher than those of the squeeze cast one.It was considered that the increased mechanical properties of the spray-cast specimen were mainly due to finer size of the Si particles distributed in Al matrix. 展开更多
关键词 hyper-eutectic al-si alloy Squeeze casting Spray casting
下载PDF
Effect of slow shot speed on externally solidified crystal,porosity and tensile property in a newly developed high-pressure die-cast Al-Si alloy
2
作者 Wen-ning Liu Wei Zhang +6 位作者 Peng-yue Wang Yi-xian Liu Xiang-yi Jiao Ao-xiang Wan Cheng-gang Wang Guo-dong Tong Shou-mei Xiong 《China Foundry》 SCIE EI CAS CSCD 2024年第1期11-19,共9页
The effect of slow shot speed on externally solidified crystal(ESC),porosity and tensile property in a newly developed high-pressure die-cast Al-Si alloy was investigated by optical microscopy(OM),scanning electron mi... The effect of slow shot speed on externally solidified crystal(ESC),porosity and tensile property in a newly developed high-pressure die-cast Al-Si alloy was investigated by optical microscopy(OM),scanning electron microscopy(SEM)and laboratory computed tomography(CT).Results showed that the newly developed AlSi9MnMoV alloy exhibited improved mechanical properties when compared to the AlSi10MnMg alloy.The AlSi9MnMoV alloy,which was designed with trace multicomponent additions,displays a notable grain refining effect in comparison to the AlSi10MnMg alloy.Refining elements Ti,Zr,V,Nb,B promote heterogeneous nucleation and reduce the grain size of primaryα-Al.At a lower slow shot speed,the large ESCs are easier to form and gather,developing into the dendrite net and net-shrinkage.With an increase in slow shot speed,the size and number of ESCs and porosities significantly reduce.In addition,the distribution of ESCs is more dispersed and the net-shrinkage disappears.The tensile property is greatly improved by adopting a higher slow shot speed.The ultimate tensile strength is enhanced from 260.31 MPa to 290.31 MPa(increased by 11.52%),and the elongation is enhanced from 3.72%to 6.34%(increased by 70.52%). 展开更多
关键词 hypoeutectic al-si alloy high pressure die casting POROSITY externally solidified crystal tensile property
下载PDF
Growth mechanism of primary silicon in cast hypoeutectic Al-Si alloys 被引量:10
3
作者 王守仁 马茹 +2 位作者 王英姿 王勇 杨丽颖 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第6期1264-1269,共6页
The microstructural features of hypoeutectic AI-10%Si alloy were observed using optical microscopy and electron backscatter diffraction. The results show that primary silicon particles are frequently found in hypoeute... The microstructural features of hypoeutectic AI-10%Si alloy were observed using optical microscopy and electron backscatter diffraction. The results show that primary silicon particles are frequently found in hypoeutectic alloys. Hence, the nucleation and growth mechanisms of the precipitation of primary silicon of hypoeutectic Al-10%Si alloy melts were investigated. It was discovered that Si atoms are easy to segregate and form Si-Si clusters, which results in the formation of primary silicon even in eutectic or hypoeutectic Al-Si alloys. In addition, solute redistribution caused by chemical driving force and large pile-ups or micro-segregation of the solute play an important role in the formation of the primary silicon, and the solute redistribution equations were derived from Jackson-Chalmers equations. Once Si solute concentration exceeds eutectic composition, primary silicon precipitates are formed at the front of solid/liquid interface. 展开更多
关键词 al-si alloys SOLIDIFICATION crystal growth primary silicon solute redistribution
下载PDF
Effect of ultrasonic vibration on Fe-containing intermetallic compounds of hypereutectic Al-Si alloys with high Fe content 被引量:14
4
作者 林冲 吴树森 +2 位作者 钟鼓 万里 安萍 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第5期1245-1252,共8页
The Fe-containing intermetallic compounds with high melting point in hypereutectic Al-Si alloys can improve the heat resistance and wear resistance at elevated temperatures. However, the long needle-like Fe-containing... The Fe-containing intermetallic compounds with high melting point in hypereutectic Al-Si alloys can improve the heat resistance and wear resistance at elevated temperatures. However, the long needle-like Fe-containing compounds in the alloys produced by conventional casting process are detrimental to the strength of matrix. The effect of ultrasonic vibration (USV) on the morphology change of Fe-containing intermetallic compounds in the hypereutectic Al-17Si-xFe (x=2, 3, 4, 5) alloys was systematically studied. The results show that, the Fe-containing intermetallic compounds are mainly composed of long needle-like β-Al5FeSi phase with a small amount of plate-like δ-Al4FeSi2 phase in Al-17Si-2Fe alloy produced by conventional casting process. With the increase of Fe content from 2% to 5% in the alloys, the amount of plate-like or coarse needle-like δ-Al4FeSi2 phase increases while the amount of long needle-like β-Al5FeSi phases decreases. In Al-17Si-5Fe alloy, the Fe-containing intermetallic compounds exist mainly as coarse needle-like δ-Al4FeSi2 phase. After USV treatment, the Fe-containing compounds in the Al-17Si-xFe alloys are refined and exist mainly as δ-Al4FeSi2 particles, with average grain size ranging from 26 μm to 37 μm, and only a small amount of β-Al5FeSi phases remain. The mechanism of USV on the morphology of Fe-containing intermetallic compounds was also discussed. 展开更多
关键词 hypereutectic al-si alloy ultrasonic vibration Fe-containing intermetallic compound
下载PDF
Grain refining mechanism of Al-3B master alloy on hypoeutectic Al-Si alloys 被引量:11
5
作者 刘源 丁超 李言祥 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1435-1440,共6页
Al-3B master alloy is a kind of efficient grain refiner for hypoeutectic Al-Si alloys. Experiments were carried out to evaluate the effect of undissolved AlB2 particles in Al-3B master alloy on the grain refinement of... Al-3B master alloy is a kind of efficient grain refiner for hypoeutectic Al-Si alloys. Experiments were carried out to evaluate the effect of undissolved AlB2 particles in Al-3B master alloy on the grain refinement of Al-7Si. It is found that the number and the settlement of AlB2 particles in the melt all have effect on the grain refining efficiency. On the basis of experiments and theoretical analysis, a new grain refinement mechanism was proposed to explain the grain refinement action of Al-3B on hypoeutectic Al-Si alloys. The formation of 'Al-AlB2' shell structure is the direct reason for grain refinement and the undissolved AlB2 particles is the indirect nucleating base for subsequent α(Al) phase. 展开更多
关键词 Al-3B master alloy hypoeutectic al-si alloys nucleation mechanism grain refinement
下载PDF
Microstructure evolution of spray-formed hypereutectic Al-Si alloys in semisolid reheating process 被引量:4
6
作者 朱学卫 王日初 +1 位作者 彭建 彭超群 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第6期1766-1772,共7页
The Al-27%Si alloy was prepared by the spray forming process,and its microstructure evolution during the semisolid reheating process was investigated.The results show that,the primary Si phase coarsens during the rehe... The Al-27%Si alloy was prepared by the spray forming process,and its microstructure evolution during the semisolid reheating process was investigated.The results show that,the primary Si phase coarsens during the reheating process and the coarsening rate increases with the increase of reheating temperature.The eutectic phase is produced in the molten region when quenched in the cold water.The microstructure evolution in the semisolid state can be divided into three stages.The remarkable characteristic of the first stage is only a solid-state phase transformation process.However,the region around the α(Al) matrix gradually melts in the second stage.The primary Si in the liquid phase coarsens obviously,and the eutectic phase is produced in the molten region when the specimens are quenched in cold water.In the last stage,the same thing as that in the second stage happens except that all the α(Al) matrixes are melted. 展开更多
关键词 spray forming al-si alloy SEMISOLID coarsening rate
下载PDF
Overflowing phenomenon during ultrasonic treatment in Al-Si alloys 被引量:3
7
作者 张宇博 卢一平 +3 位作者 接金川 傅莹 钟德水 李廷举 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第11期3242-3248,共7页
At the late stage of solidification with ultrasonic treatment (UST) in Al-Si alloys, a part of semisolid overflows and climbs along the probe. The interesting phenomenon and its influence on the solidification micro... At the late stage of solidification with ultrasonic treatment (UST) in Al-Si alloys, a part of semisolid overflows and climbs along the probe. The interesting phenomenon and its influence on the solidification microstructure were investigated in order to better study the mechanism of UST. It is considered that the overflowing phenomenon occurs due to the changes of vibration and flow in the remaining semisolid. Because the overflowed portion comes from the region with intense UST effect and vibrates with the probe during solidification, great modification of primary and euteetic Si (about 10 pm in length) and refinement of primary a(Al) (about 70 μm in size) are observed in this portion. 展开更多
关键词 al-si alloy ultrasonic treatment overflowing phenomenon solidification microstructure
下载PDF
Dry sliding wear behavior of rheocast hypereutectic Al-Si alloys with different Fe contents 被引量:1
8
作者 林冲 吴树森 +2 位作者 吕书林 曾劲彪 安萍 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第3期665-675,共11页
The effect of iron content on wear behavior of hypereutectic Al?17Si?2Cu?1Ni alloy produced by rheocasting process was investigated. The dry sliding wear tests were carried out with a pin-on-disk wear tester. The resu... The effect of iron content on wear behavior of hypereutectic Al?17Si?2Cu?1Ni alloy produced by rheocasting process was investigated. The dry sliding wear tests were carried out with a pin-on-disk wear tester. The results show that the wear rate of the rheocast alloy is lower than that of the alloy produced by conventional casting process under the same applied load. The fine particle-likeδ-Al4(Fe,Mn)Si2 and polygonalα-Al15(Fe,Mn)3Si2 phases help to improve the wear resistance of rheocast alloys. As the volume fraction of fine Fe-bearing compounds increases, the wear rate of the rheocast alloy decreases. Moreover, the wear rate of rheocast alloy increases with the increase of applied load from 50 to 200 N. For the rheocast alloy with 3% Fe, oxidation wear is the main mechanism at low applied load (50 N). At higher applied loads, a combination of delamination and oxidation wear is the dominant wear mechanism. 展开更多
关键词 dry sliding wear hypereutectic al-si alloy RHEOCASTING Fe-bearing compound wear mechanism
下载PDF
Effects of Mg content on primary Mg_2Si phase in hypereutectic Al-Si alloys 被引量:5
9
作者 黄治黎 王开 +3 位作者 张志明 李波 薛寒松 杨大壮 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第10期3197-3203,共7页
Hypereutectic Al-Si alloy with variant Mg contents were fabricated by casting,and the effects of Mg content on the microstructure of primary Mg2Si particles in hypereutectic Al-Si alloys were investigated.The results ... Hypereutectic Al-Si alloy with variant Mg contents were fabricated by casting,and the effects of Mg content on the microstructure of primary Mg2Si particles in hypereutectic Al-Si alloys were investigated.The results show that the volume fraction of primary Mg2Si particles increases linearly with raising the Mg content,but the average size of Mg2Si particles does not exhibit a corresponding change.When the Mg content is 3%,á1 0 0? directions have the fastest growth velocity,so that Mg2Si particles are likely to form octahedron shape.When gradually increasing the Mg content,the distributions of Mg and Si atoms on the solid-liquid interface become inhomogeneous,which results in the formation of irregular octahedron structures.Finally,when the Mg content is about 10%,the morphology of primary Mg2Si particles changes from the octahedron shape into various complex structures with a large size. 展开更多
关键词 hypereutectic al-si alloys primary Mg2Si particles growth pattern growth velocity
下载PDF
Microstructure Evolution of Semi-solid Processed Hyper-eutectic Al-30%Si Alloy 被引量:2
10
作者 Yanjun Li Weimin Mao Xueyou Zhong(Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 1999年第4期259-261,共3页
An investigation was made on the influences of mechanical stirring on microstructure of hyper-eutectic Al-30%Si alloy (inmass fraction) during solidification. The primary Si crystals formed in the alloy melt were grad... An investigation was made on the influences of mechanical stirring on microstructure of hyper-eutectic Al-30%Si alloy (inmass fraction) during solidification. The primary Si crystals formed in the alloy melt were gradually changed from elongated platelets tonear-spherical shapes by mechanical stirring. The spheroidization of primary St crystals occurs by the mechanism of bending and fractureof Si platelets, wear and collision between Si crystals, and coalescence of small Si particles. The influence of under-cooling and coolingrate of the alloy melt on primary Si crystals of semi-solid processed alloys is investigated as well. The increase of under-cooling andcooling rate decreases the size of primary Si crystals. 展开更多
关键词 semi-solid state process solidification structure mechanical stirring hyper-eutectic al-si alloy
下载PDF
Al-Si-P master alloy and its modification and refinement performance on Al-Si alloys 被引量:11
11
作者 ZUO Min LIU Xiangfa +1 位作者 DAI Hongshang LIU Xiangjun 《Rare Metals》 SCIE EI CAS CSCD 2009年第4期412-417,共6页
An Al-Si-P master alloy has been developed by an in-situ reaction and the electron probe microanalyzer (EPMA) results show that there are many pre-formed AlP particles contained in the master alloy. Silicon introduc... An Al-Si-P master alloy has been developed by an in-situ reaction and the electron probe microanalyzer (EPMA) results show that there are many pre-formed AlP particles contained in the master alloy. Silicon introduced into the system plays an important role in remarkably improving the distribution and content of AlP particles due to their similar crystal structure and lattice parameters. ZL109 alloys have shown fast modification response to the addition of 0.5% Al-15Si-3.5P master alloy at 720℃, with a mass of primary Si precipitating in size of about 15 μm. Also, coarse primary Si grains in AI-30Si alloy can be refined dramatically from 150 μm to 37 μm after the addition of 2.0% Al-15Si-3.5P master alloy at 850℃. The P recovery of the Al-15Si-3.5P master alloy is much higher than that of a Cu-8.5P master alloy due to the pre-formed AlP particles. 展开更多
关键词 al-si alloys al-si-P master alloy primary Si P recovery MODIFICATION REFINEMENT
下载PDF
Functions and mechanism of modification elements in eutectic solidification of Al-Si alloys:A brief review 被引量:6
12
作者 Zu Fangqiu Li Xiaoyun 《China Foundry》 SCIE CAS 2014年第4期287-295,共9页
Being used more and more widely in engineering,AlSi alloys comprise about 80%of all kinds of aluminum alloys,which are the most widely utilized nonferrous alloys.Although most Al-Si alloys consist of multiple componen... Being used more and more widely in engineering,AlSi alloys comprise about 80%of all kinds of aluminum alloys,which are the most widely utilized nonferrous alloys.Although most Al-Si alloys consist of multiple components,the eutectics in the structure accounts for 50%-90%of the sum volume of such alloys.Therefore,understanding the modification mechanism and function rules of the AlSi eutectic solidification is the technical key in controlling the structures and properties of such casting alloys.The present paper chiefly reviews recent investigation developments and important conclusions along the lines of the functions of modification elements and their modification mechanism in the eutectic solidification of Al-Si alloys. 展开更多
关键词 al-si alloys eutectic solidification MODIFICATION silicon morphology growth kinetics
下载PDF
Effect of Li content on microstructure and mechanical property of Mg-xLi-3(Al-Si) alloys 被引量:3
13
作者 Cheng ZHANG Liang WU +6 位作者 Zi-long ZHAO Zhi-hui XIE Guang-sheng HUANG Lei LIU Bin JIANG Andrej ATRENS Fu-sheng PAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第12期2506-2513,共8页
Mg-4 Li-3(Al-Si),Mg-8 Li-3(Al-Si)and Mg-12 Li-3(Al-Si)alloys based on theα-Mg,α-Mg+β-Li,β-Li phases,respectively,were produced to investigate the effect of alloying with Al-Si eutectic on the microstructure and me... Mg-4 Li-3(Al-Si),Mg-8 Li-3(Al-Si)and Mg-12 Li-3(Al-Si)alloys based on theα-Mg,α-Mg+β-Li,β-Li phases,respectively,were produced to investigate the effect of alloying with Al-Si eutectic on the microstructure and mechanical properties of the three alloys.Alloying with the Al-Si eutectic of Mg-xLi(x=4,8 and 12 wt.%)alloys caused the formation of different types of Al-Li precipitates:Al3Li,AlLi and Li3Al2,respectively.Also,considerable quantities of Mg2Si phase particles were found in the three alloys.The results of tensile tests showed that the Mg-4Li-3(Al-Si)alloy exhibited the highest ultimate tensile strength(UTS)of 249 MPa but the lowest elongation of 6.3%.The Mg-12Li-3(Al-Si)alloy had the highest elongation of 26%but the lowest UTS of 173 MPa.The different mechanical properties were attributed to the different crystal structures of the three alloys and the precipitate with different type,morphology and distribution. 展开更多
关键词 Mg-Li alloy al-si eutectic second phase tensile strength ELONGATION
下载PDF
In-situ observation of porosity formation during directional solidification of Al-Si casting alloys 被引量:3
14
作者 Zhao Lei Liao Hengcheng +2 位作者 Pan Ye Wang Qigui Sun Guoxiong 《China Foundry》 SCIE CAS 2011年第1期14-18,共5页
In-situ observation of porosity formation during directional solidification of two Al-Si alloys (7%Si and 13%Si) was made by using of micro-focus X-ray imaging.In both alloys,small spherical pores initially form in th... In-situ observation of porosity formation during directional solidification of two Al-Si alloys (7%Si and 13%Si) was made by using of micro-focus X-ray imaging.In both alloys,small spherical pores initially form in the melt far away from the eutectic solid-liquid (S/L) interface and then grow and coagulate during solidification.Some pores can float and escape from the solidifying melt front at a relatively high velocity.At the end of solidification,the remaining pores maintain spherical morphology in the near eutectic alloy but become irregular in the hypoeutectic alloy.This is attributed to different solidification modes and aluminum dendrite interactions between the two alloys.The mechanism of the porosity formation is briefly discussed in this paper. 展开更多
关键词 in-situ observation porosity formation al-si casting alloy micro-focus X-ray directional solidification
下载PDF
Effect of hot extrusion process on microstructure and mechanical properties of hypereutectic Al-Si alloys 被引量:3
15
作者 Li Runxia Yu Fuxiao Zuo Liang 《China Foundry》 SCIE CAS 2011年第1期145-149,共5页
The hypereutectic Al-Si alloy was fabricated by hot extrusion process after solidified under electromagnetic stirring,and the microstructure and mechanical properties of the alloy were studied.The results show that th... The hypereutectic Al-Si alloy was fabricated by hot extrusion process after solidified under electromagnetic stirring,and the microstructure and mechanical properties of the alloy were studied.The results show that the ultimate tensile strength and elongation of the alloy reached 229.5 MPa and 4.6%,respectively with the extrusion ratio of 10,and 263.2 MPa and 5.4%,respectively with extrusion ratio of 20.This indicates that the mechanical properties of the alloy are obviously improved with the increase of extrusion ratio.After hot extruded,the primary Si,eutectic Si,Mg2Si,AlNi,Al7Cu4Ni and Al-Si-Mn-Fe-Cr-Mo phases are refined to different extent,and the efficiency of refinement is obvious more and more with the increase of extrusion ratio.After T6 heat treatment,the sharp corners of these phases become passivated and roundish,and the mechanical properties are improved.The ultimate tensile strength of the extruded alloy after T6 heat treatment reaches 335.3 MPa with extrusion ratio of 10 and 353.6 MPa with extrusion ratio of 20. 展开更多
关键词 hypereutectic al-si alloy electromagnetic stirring hot extrusion process primary Si phase
下载PDF
Microstructure and high temperature tensile properties of Al-Si-Cu-Mn-Fe alloys prepared by semi-solid thixoforming 被引量:2
16
作者 Bo LIN Tao FAN +3 位作者 Hao-yu LI Yu-liang ZHAO Wei-wen ZHANG Kun LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第8期2232-2249,共18页
The differences in the microstructure and elevated temperature tensile properties of gravity die cast,squeeze cast,and semi-solid thixoformed Al-Si-Cu-Mn-Fe alloys after thermal exposure at 300℃were discussed.The res... The differences in the microstructure and elevated temperature tensile properties of gravity die cast,squeeze cast,and semi-solid thixoformed Al-Si-Cu-Mn-Fe alloys after thermal exposure at 300℃were discussed.The results demonstrate that the elevated temperature tensile properties of semi-solid thixoformed alloys were significantly higher than those of gravity die cast and squeeze cast alloys,especially after thermal exposure for 100 h.The ultimate tensile strength(UTS)of semi-solid thixoformed alloys after thermal exposure at 300℃for 0.5,10 and 100 h were 181,122 and 110 MPa,respectively.The UTS values of semi-solid thixoformed alloys were higher than those of heat resistant aluminum alloys used in commercial applications.The enhanced elevated temperature tensile properties of semi-solid thixoformed experimental alloys after thermal exposure can be attributed to the combined reinforcement of precipitation strengthening and grain boundary strengthening due to thermally stable intermetallic phases as well as suitable grain size. 展开更多
关键词 al-si alloys iron-rich intermetallics semi-solid thixoforming MICROSTRUCTURE tensile properties thermal exposure
下载PDF
Effects of P+Cr complex modification and solidification conditions on microstmcture of hypereutectic Al-Si alloys by wedge-shaped copper mould casting 被引量:2
17
作者 Zhang Haitao Zuo Kesheng +3 位作者 Han Xing Shao Bo Qin Ke Cui Jianzhong 《China Foundry》 SCIE CAS 2014年第6期481-486,共6页
Large and segregated primary Si particles may drastically decrease the mechanical properties of AI-Si alloys. To solve this problem, a P-Cr complex modifier was added into the alloy, and the effects of P-Cr complex mo... Large and segregated primary Si particles may drastically decrease the mechanical properties of AI-Si alloys. To solve this problem, a P-Cr complex modifier was added into the alloy, and the effects of P-Cr complex modification and solidification conditions on the microstructure of hypereutectic Al-Si alloys casting produced in wedge-shaped copper mould were studied. The thermal analysis technique was applied to calculate the cooling rate during solidification. The microstructures were observed by means of optical and scanning electron microscopies. Results showed that the primary Si segregates in the as-cast hypereutectic AI-Si alloys. The segregation of primary Si can be inhibited by adding a P+Cr complex modifier and increasing the cooling rate during solidification. The refinement of primary Si particles by P+Cr complex modification is due to the formation of CrSi2 and AlP particles which act as the heterogeneous nuclei for the primary Si phase. The segregation of Si was also inhibited through the adherence of heavier CrSi2 particles to the primary Si particles. 展开更多
关键词 hypereutectic al-si alloys primary silicon P-Cr complex modifier cooling rate
下载PDF
Influence of forging and heat treatment on wear properties of Al-Si and Al-Pb bearing alloys in oil lubricated conditions 被引量:1
18
作者 Erol FEYZULLAHOGLU Alpay Tamer ERTURK Ersin Asim GUVEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第12期3575-3583,共9页
The tribological behaviours of aluminium-based bearing alloys with different compositions, forged and heat treated materials, were investigated in oil lubricated conditions. Tested materials were Al-8.5Si-3.5Cu and Al... The tribological behaviours of aluminium-based bearing alloys with different compositions, forged and heat treated materials, were investigated in oil lubricated conditions. Tested materials were Al-8.5Si-3.5Cu and Al-15Pb-3.7Cu-1.5Si-1.1Fe. The effects of hardness, heat treatment and forging on wear behaviours of the tested materials were investigated. In forging process, 10%-20%strains were applied. Heat treatment (T6) was performed to the materials. The wear tests of all specimens were performed with a pin-on-disc wear test machine. Forging process increased hardness value of the tested materials. A forging strain of 10%-20%has no significant effect on mass loss. 展开更多
关键词 heat treatment FORGING al-si alloy Al-Pb alloy WEAR
下载PDF
Assessment of modification level of hypoeu- tectic Al-Si alloys by pattern recognition of cooling curves 被引量:1
19
作者 CHEN Xiang GENG Hui-yuan LI Yan-xiang 《China Foundry》 SCIE CAS 2005年第4期246-253,共8页
Most evaluations of modification level are done according to a specific scale based on an American Foundry Society (AFS) standard wall chart as qualitative analysis in Al-Si casting production currently. This method i... Most evaluations of modification level are done according to a specific scale based on an American Foundry Society (AFS) standard wall chart as qualitative analysis in Al-Si casting production currently. This method is quite dependent on human experience when making comparisons of the microstructure with the standard chart. And the structures depicted in the AFS chart do not always resemble those seen in actual Al-Si castings. Therefore, this qualitative analysis procedure is subjective and can introduce human-caused errors into comparative metallographic analyses. A quantization parameter of the modification level was introduced by setting up the relationship between mean area weighted shape factor of eutectic silicon phase and the modification level using image analysis technology. In order to evaluate the modification level, a new method called "intelligent evaluating of melt quality by pattern recognition of thermal analysis cooling curves" has also been introduced. The results show that silicon modification level can be precisely assessed by comparison of the cooling curve of the melt to be evaluated with the one most similar to it in a database. 展开更多
关键词 al-si alloys MODIFICATION thermal analysis COOLING CURVE recognition
下载PDF
Influence of titanium content on wear resistance of electrolytic low-titanium eutectic Al-Si piston alloys 被引量:1
20
作者 Wang Jiefang Xie Jingpei +4 位作者 Yan Shuqing Liu Zhongxia Weng Yonggang Wang Mingxing Song Tianfu 《China Foundry》 SCIE CAS 2008年第3期162-166,共5页
The wear resistance of six kinds of the electrolytic low-titanium eutectic AI-Si piston alloys with various Ti content ranging from 0.00wt.% to 0.21wt.% has been studied. A new method of adding Ti is adopted in the el... The wear resistance of six kinds of the electrolytic low-titanium eutectic AI-Si piston alloys with various Ti content ranging from 0.00wt.% to 0.21wt.% has been studied. A new method of adding Ti is adopted in the electrolytic low-titanium aluminum alloy ingots. The electrolytic low-titanium eutectic AI-Si piston alloys are produced by remelting the electrolytic low-titanium aluminum alloy, crystal silicon, pure magnesium, AI-50%Cu and AI-10%Mn master alloy. The wear experiments are conducted using MM200 wear testing machine under lubricating condition. The results indicate that the better wear resistance and the less weight loss are achieved in the study for the eutectic AI-Si piston alloys with 0.08wt.%-0.12wt.% Ti content. The highest ultimate tensile strength of 135.94 MPa at 300℃ and HV141.70 hardness of the alloys are obtained at 0.12wt.% and 0.08wt.% Ti content, respectively. The wear mechanism of the eutectic AI-Si piston alloys under lubricating condition is abrasive wear. 展开更多
关键词 electrolytic low-titanium aluminum alloy eutectic al-si piston alloy wear resistance
下载PDF
上一页 1 2 9 下一页 到第
使用帮助 返回顶部