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p-GaP与Au/Zn/AuSb的欧姆接触 被引量:1
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作者 张福甲 王德明 李宝军 《半导体光电》 CAS CSCD 北大核心 1993年第1期75-80,共6页
用 SEM,AES 和 XRD 研究了 Au/Zn/AuSb 多层金属结构与 p-GaP 在525℃合金化4min 后,它们所形成的金属一半导体层的基本特性。当 GaP 的 p 型层空穴浓度是5×1.0^(18)cm^(-3)时,测量出它的比接触电阻是4×10^(-4)Ω·cm^(-2... 用 SEM,AES 和 XRD 研究了 Au/Zn/AuSb 多层金属结构与 p-GaP 在525℃合金化4min 后,它们所形成的金属一半导体层的基本特性。当 GaP 的 p 型层空穴浓度是5×1.0^(18)cm^(-3)时,测量出它的比接触电阻是4×10^(-4)Ω·cm^(-2)。它比 AuZn 合金所形成的比接触电阻降低了一个数量级,从而形成了良好的金属-半导体欧姆接触。 展开更多
关键词 冶金相 欧姆接触 Au/Zn/AuSb
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Phase transformation and damping behavior of lightweight porous TiNiCu alloys fabricated by powder metallurgy process 被引量:2
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作者 江鸿杰 柯常波 +2 位作者 曹姗姗 马骁 张新平 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2029-2036,共8页
Porous TiNiCu ternary shape memory alloys (SMAs) were successfully fabricated by powder metallurgy method. The microstructure, martensitic transformation behavior, damping performance and mechanical properties of th... Porous TiNiCu ternary shape memory alloys (SMAs) were successfully fabricated by powder metallurgy method. The microstructure, martensitic transformation behavior, damping performance and mechanical properties of the fabricated alloys were intensively studied. It is found that the apparent density of alloys decreases with increasing the Cu content, the porous Ti50Ni40Cu10 alloy exhibits wide endothermic and exothermic peaks arisen from the hysteresis of martensitic transformations, while the porous Ti50Ni30Cu20 alloy shows much stronger and narrower endothermic and exothermic peaks owing to the B2-B19 transformation taking place easily. Moreover, the porous Ti50Ni40Cu10 alloy shows a lower shape recovery rate than the porous Ti50Ni50 alloy, while the porous Ti50Ni30Cu20 alloy behaves reversely. In addition, the damping capacity (or internal friction, IF) of the porous TiNiCu alloys increases with increasing the Cu content. The porous Ti50Ni30Cu20 alloy has very high equivalent internal friction, with the maximum equivalent internal friction value five times higher than that of the porous Ti50Ni50 alloy. 展开更多
关键词 porous TiNiCu alloys powder metallurgy martensitic transformation damping behavior
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Bi-modal microstructure in a powder metallurgical ferritic steel
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作者 刘锋 刘咏 +4 位作者 吴宏 方京华 赵大鹏 张刘杰 刘东华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第2期330-334,共5页
Ferritic steel with a nominal composition of Fe-14Cr-3W-0.42Ti-0.32Y was prepared by mixing gas-atomized prealloyed powder and mechanically alloyed powder. The microstructure is much different fxom other ferritic stee... Ferritic steel with a nominal composition of Fe-14Cr-3W-0.42Ti-0.32Y was prepared by mixing gas-atomized prealloyed powder and mechanically alloyed powder. The microstructure is much different fxom other ferritic steels with the same composition and prepared via only mechanically alloyed powder. A bi-modal structure, which consists of pure ferritic grains and martensitic grains, was obtained after hot forging and air cooling. A phase transformation of αbcc→γfcc→α'bcc was also discovered in microstructural observation. The bi-modal microstructure shows a good combination of high strength and high ductility. 展开更多
关键词 ferritic steel powder metallurgy phase transformation bi-modal microstructure mechanical property
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Phase evolution in AlSi20/8009 aluminum alloy during high temperature heating near melting point and cooling processes 被引量:2
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作者 Hai-bin LIU Hua-guang SU +2 位作者 Ding-fa FU Fu-lin JIANG Hui ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第5期1157-1168,共12页
The AlSi20/8009 aluminum alloy was heated to high temperatures near the melting point and cooled to investigate the effect of external Si addition on the phase evolution of Al12(Fe,V)3 Si dispersion. Differential scan... The AlSi20/8009 aluminum alloy was heated to high temperatures near the melting point and cooled to investigate the effect of external Si addition on the phase evolution of Al12(Fe,V)3 Si dispersion. Differential scanning calorimeter, scanning electron microscope, energy dispersive spectrometer and X-ray diffractometer were employed.The results showed that Al12(Fe,V)3 Si and Si phases evolved into a needle-like Al4.5 Fe Si phase and a nano-sized V-rich phase during holding the alloy at 580-600℃. With increasing holding temperature to 620-640℃, Al4.5 Fe Si and nano-sized V-rich phases evolved reversibly into Al12(Fe,V)3 Si and Si phases, of which Al12(Fe,V)3 Si occupied a coarse and hexagonal morphology. During the alloy(after holding at 640 ℃) furnace cooling to 570 ℃ or lower, Si and Al12(Fe,V)3 Si phases evolved into strip-like Al4.5 Fe Si and the V-rich phases, which is a novel formation route for Al4.5 Fe Si phase different from Al-Fe-Si ternary system. 展开更多
关键词 SiCp/8009Al composite phase evolution metallurgical joining re-melting COOLING
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Fabrication of wavy γ-TiAl based sheet with foil metallurgy 被引量:3
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作者 LIU Jiang-ping SU Yan-qing +4 位作者 LUO Liang-shun CHEN Hui XU Yan-jin GUO Jing-jie FU Heng-zhi 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第1期72-77,共6页
A 0.7 mm-thick wavy γ-TiAl sheet with fully lamellar microstructure was fabricated by hot pressing Ti/Al alternate foils with heat treatment of 640 °C, 15 h+850 °C, 35 h+1350 °C, 2 h. The intermetall... A 0.7 mm-thick wavy γ-TiAl sheet with fully lamellar microstructure was fabricated by hot pressing Ti/Al alternate foils with heat treatment of 640 °C, 15 h+850 °C, 35 h+1350 °C, 2 h. The intermetallic compounds formed during heat treatments were identified by scanning electron microscopy (SEM) and X-ray diffraction (XRD). TiAl3 was the only observed phase at the Ti/Al interface when Al foils were not consumed. After being annealed at 850 °C for 35 h, the microstructure was composed of α-Ti, α2-Ti3Al, γ-TiAl and TiAl2. A fully lamellar microstructure formed after annealing at 1350 °C. Most of the angles between the lamellar interface and the sheet plane are below 30°. Using thinner starting foils is favorable to produce sheets with fine microstructure. 展开更多
关键词 solid state reaction phase transformation titanium aluminides foil metallurgy
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Combined powder metallurgy routes to improve thermal and mechanical response of Al−Sn composite phase change materials 被引量:2
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作者 Chiara CONFALONIERI Maxime PERRIN Elisabetta GARIBOLDI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第12期3226-3239,共14页
Powder metallurgy processes are suitable to produce form-stable solid−liquid phase change materials from miscibility gap alloys.They allow to obtain a composite metallic material with good dispersion of low-melting ac... Powder metallurgy processes are suitable to produce form-stable solid−liquid phase change materials from miscibility gap alloys.They allow to obtain a composite metallic material with good dispersion of low-melting active phase particles in a high-melting passive matrix,preventing leakage of the particles during phase transition and,therefore,increasing the stability of thermal response.Also,the matrix provides structural properties.The aim of this work is to combine conventional powder mixing techniques(simple mixing and ball milling)to improve active phase isolation and mechanical properties of an Al−Sn alloy.As matter of fact,ball milling of Sn powder allows to reduce hardness difference with Al powder;moreover,ball milling of the two powders together results in fine microstructure with improved mechanical properties.In addition,different routes applied showed that thermal response depends on the microstructure and,in particular,on the particle size of the active phase.In more detail,coarse active phase particles provide a fast heat release with small undercooling,while small particles solidify more slowly in a wide range of temperature.On the other hand,melting and,consequently,heat storage are independent of the particle size of the active phase.This potentially allows to“tailor”the thermal response by producing alloys with suitable microstructure. 展开更多
关键词 metallic phase change materials powder metallurgy thermal stability mechanical properties miscibility gap alloys
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Effect of Mg composition on sintering behaviors and mechanical properties of Al-Cu-Mg alloy 被引量:3
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作者 Min Chul OH Byungmin AHN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第S1期53-58,共6页
Al-3Cu-Mg alloy was fabricated by the powder metallurgy(P/M) processes. Air-atomized powders of each alloying element were blended with various Mg contents(0.5%, 1.5%, and 2.5%, mass fraction). The compaction pressure... Al-3Cu-Mg alloy was fabricated by the powder metallurgy(P/M) processes. Air-atomized powders of each alloying element were blended with various Mg contents(0.5%, 1.5%, and 2.5%, mass fraction). The compaction pressure was selected to achieve the elastic deformation, local plastic deformation, and plastic deformation of powders, respectively, and the sintering temperatures for each composition were determined, where the liquid phase sintering of Cu is dominant. The microstructural analysis of sintered materials was performed using optical microscope(OM) and scanning electron microscope(SEM) to investigate the sintering behaviors and fracture characteristics. The transverse rupture strength(TRS) of sintered materials decreased with greater Mg content(Al-3Cu-2.5Mg). However, Al-3Cu-0.5Mg alloy exhibited moderate TRS but higher specific strength than Al-3Cu without Mg addition. 展开更多
关键词 powder metallurgy Al-Cu-Mg alloy spinel structure liquid phase sintering
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Traces of Metallurgy at the Site of Losino 15, Compared with Other Finds Related to Ancient Metallurgy
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作者 Magdalena Piotrowska 《Journal of Environmental Science and Engineering(B)》 2015年第10期529-537,共9页
The eponymous site is located in the territory of Poland--the northern part of the central section of the Stupia river, about 30 km from the coast of the Baltic sea. The site of Losino 15 revealed some traces of a set... The eponymous site is located in the territory of Poland--the northern part of the central section of the Stupia river, about 30 km from the coast of the Baltic sea. The site of Losino 15 revealed some traces of a settlement of the Pomeranian and the Wielbark cultures. The most interesting features discovered at the study site are the remains of bloomery furnaces. The site of Losino 15 yielded 10 features interpreted as relics of the bloomery shaft furnace with a pit. They were characterized by a high degree of deterioration-due to the agronomic activities and slope processes, only the bottom part of the slag-pit have been preserved. These are the remains of shaft furnaces with a pit called slag-pit fumace, whose relics are slag-pits filled with slag. The site of Losino 15 yielded slag with a total weight of about 100 kg. Two alternative and temporarily equivalent hypotheses can be proposed here. According to the former one, the creators of the bloomery were representatives of the Pomeranian culture, and in the latter version--they represented the Wielbark culture. 展开更多
关键词 Poland Pomerania Iron Age ancient metallurgy bloomer furnaces.
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Microstructure,mechanical and wear properties of aluminum borate whisker reinforced aluminum matrix composites 被引量:5
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作者 Neeraj PANDEY ICHAKRABARTY +2 位作者 Kalpana BARKANE NSMEHTA MRMAJHI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第7期1731-1742,共12页
The microstructural features and the consequent mechanical properties were characterized in aluminium borate whisker(ABOw)(5, 10 and 15 wt.%) reinforced commercially-pure aluminium composites fabricated by conventiona... The microstructural features and the consequent mechanical properties were characterized in aluminium borate whisker(ABOw)(5, 10 and 15 wt.%) reinforced commercially-pure aluminium composites fabricated by conventional powder metallurgy technique. The aluminium powder and the whisker were effectively blended by a semi-powder metallurgy method. The blended powder mixtures were cold compacted and sintered at 600 ℃. The sintered composites were characterized for microstructural features by optical microscopy(OM), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), transmission electron microscopy(TEM) and X-ray diffraction(XRD) analysis. Porosity in the composites with variation in ABOw contents was determined. The effect of variation in content of ABOw on mechanical properties, viz. hardness, bending strength and compressive strength of the composites was evaluated. The dry sliding wear behaviour was evaluated at varying sliding distance at constant loads. Maximum flexural strength of 172 MPa and compressive strength of 324 MPa with improved hardness around HV 40.2 are obtained in composite with 10 wt.% ABOw. Further increase in ABOw content deteriorates the properties. A substantial increase in wear resistance is also observed with 10 wt.% ABOw. The excellent combination of mechanical properties of Al-10 wt.%ABOw composites is attributed to good interfacial bonds, less porosity and uniformity in the microstructure. 展开更多
关键词 aluminum matrix composite powder metallurgy aluminum borate whisker(ABOw)reinforcement flexural strength compression test dry sliding wear
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Porous Ti-10Mo alloy fabricated by powder metallurgy for promoting bone regeneration 被引量:1
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作者 Wei Xu Zhuo Liu +6 位作者 Xin Lu Jingjing Tian Gang Chen Bowen Liu Zhou Li Xuanhui Qu Cuie Wen 《Science China Materials》 SCIE EI CSCD 2019年第7期1053-1064,共12页
Porous Ti-lOMo alloys were fabricated by powder metallurgy using a space-holder method. The pore characteristics, m icrostructure, mechanical properties, in vitro biocompatibility, and in vivo osseointegration of the ... Porous Ti-lOMo alloys were fabricated by powder metallurgy using a space-holder method. The pore characteristics, m icrostructure, mechanical properties, in vitro biocompatibility, and in vivo osseointegration of the fabricated alloys were systematically investigated. The results show that with different weight ratios of the space-holder (NH4- HC03) added, all of the porous Ti-10Mo alloys sintered at 1,300℃ exhibited a typical W idmanstatten microstructure. The porosity and average pore size of the porous structures can be controlled in the range of 50.8%-66.9% and 70.1 -381.4μm , respectively. The Ti-10Mo alloy with 63.4% porosity exhibited the most suitable mechanical properties for implant applications with an elastic modulus of 2.9 GPa and a compressive yield strength of 127.5 MPa. In vitro9 the alloyconditioned medium showed no deleterious effect on the cell proliferation. The cell viability in this medium was higher than that of the reference group, suggesting non-toxicity and good biological characteristics of the alloy specimens. In vivo, after eight weeks* implantation, new bone tissue formed surrounding the alloy implants, and no noticeable inflammation was observed at the implantation site. The bone bonding strength of the porous Ti-10Mo alloy increased over time from 46.6N at two weeks to 176.4 N at eight weeks. Suitable mechanical properties together with excellent biocompatibility in vitro and osteointegration in vivo make the porous Ti-10Mo fabricated by powder metallurgy an attractive orthopedic implant alloy. 展开更多
关键词 POROSITY powder metallurgy structure characterization cell cytotoxicity OSTEOINTEGRATION
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