期刊文献+
共找到111篇文章
< 1 2 6 >
每页显示 20 50 100
Microstructures and mechanical properties of extruded 2024 aluminum alloy reinforced by FeNiCrCoAl_3 particles 被引量:7
1
作者 王志伟 原燕波 +2 位作者 郑瑞晓 Kei AMEYAMA 马朝利 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2366-2373,共8页
Different proportions of commercial 2024 aluminum alloy powder and FeNiCrCoA13 high entropy alloy (HEA) powder were ball-milled (BM) for different time. The powder was consolidated by hot extrusion method. The mic... Different proportions of commercial 2024 aluminum alloy powder and FeNiCrCoA13 high entropy alloy (HEA) powder were ball-milled (BM) for different time. The powder was consolidated by hot extrusion method. The microstructures of the milled powder and bulk alloy were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Mechanical properties of the extruded alloy were examined by mechanical testing machine. The results show that after BM, the particle size and microstructures of the mixed alloy powder change obviously. After 48 h BM, the average size of mixed powder is about 30 nm, and then after hot extrusion, the average size of grains reaches about 70 rim. The compressive strength of the extruded alloy reaches 710 MPa under certain conditions of milling time and composition. As a result of the identification of the nano-/micro-strueture-property relationship of the samples, such high strength is attributed mainly to the nanocrystalline grains of a(Al) and nanoscaled FeNiCrCoAl3 particles, and the fine secondary phase of Al2Cu and Fe-rich phases. 展开更多
关键词 aluminium alloys FeNiCrCoAl3 reinforced particles high entropy alloy ball milling hot extrusion nano-precipitates
下载PDF
Fabrication and Mechanical Properties of 2024 Aluminum Alloy Reinforced by FeNiCrCoAl_3 High Entropy Particles 被引量:2
2
作者 Zhi-Wei Wang Rui-Xiao Zheng +2 位作者 Chao-Li Ma Li-Rong Hao Yang Han 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2013年第5期119-122,共4页
This article mainly discussed bulk material lHvl^ared by powder metallurgy, and the commercial 2024 aluminum alloy powder and FeNiCrCoA13 high entropy alloy powder (both produced by argon gas atomization process) we... This article mainly discussed bulk material lHvl^ared by powder metallurgy, and the commercial 2024 aluminum alloy powder and FeNiCrCoA13 high entropy alloy powder (both produced by argon gas atomization process) were ball-milled for different hours. The prepared powder was consolidated by hot extrusion method. The microstruetures of the milled powder and bulk alloy were examined by X - Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The thermal stability was tested by differential scanning calorimetry (DSC). Mechanical properties of the extruded alloy were examined by Vickers hardness tester and mechanical testing machine. The results show that after milling, the mixed particle sizes and microstructures of the alloy powder change obviously. The compressive strength of the extruded alloy has reached 580 MPa under certain conditions of milling time and composition. 展开更多
关键词 aluminum alloy nanocrystaUine FeNiCrCoA13 high entroy reinforced particle ball milling(BM) the extruded alloy
下载PDF
Microstructure and wear characteristics of ATZ ceramic particle reinforced gray iron matrix surface composites 被引量:3
3
作者 Xue Ma Liang-feng Li +3 位作者 Fan Zhang Zu-hua Zhang Hao Wang En-ze Wang 《China Foundry》 SCIE 2018年第3期167-172,共6页
The alumina toughened zirconia(ATZ) ceramic particle reinforced gray iron matrix surface composite was successfully manufactured by pressureless infi ltration. The porous preform played a key role in the infi ltrating... The alumina toughened zirconia(ATZ) ceramic particle reinforced gray iron matrix surface composite was successfully manufactured by pressureless infi ltration. The porous preform played a key role in the infi ltrating progress. The microstructure was observed by scanning electron microscopy(SEM); the phase constitutions was analyzed by X-ray diffraction(XRD); and the hardness and wear resistance of selected specimens were tested by hardness testing machine and abrasion testing machine, respectively. The addition of high carbon ferrochromium powders leads to the formation of white iron during solidifi cation. The wear volume loss rates of ATZ ceramic particle reinforced gray iron matrix surface composite decreases fi rst, and then tends to be stable. The wear resistance of the composite is 2.7 times higher than that of gray iron matrix. The reason is a combination of the surface hardness increase of gray iron matrix and ATZ ceramic particles and alloy carbides protecting effect on gray iron matrix. 展开更多
关键词 metal-matrix SURFACE composites pressureless infiltrating particle-reinforcEMENT SURFACE alloyING WEAR testing
下载PDF
Cavitation-erosion mechanism of laser cladded SiC particle reinforced metal matrix composite 被引量:2
4
作者 张春华 张松 +3 位作者 杨洪刚 朱圣龙 文效忠 才庆魁 《中国有色金属学会会刊:英文版》 CSCD 2005年第1期35-39,共5页
With 2 kW continuous wave Nd-YAG laser, SiC ceramic powder was laser-cladded on the AA6061 aluminium alloy surface. Within the range of process parameters investigated, the parameters were optimized to produce the SiC... With 2 kW continuous wave Nd-YAG laser, SiC ceramic powder was laser-cladded on the AA6061 aluminium alloy surface. Within the range of process parameters investigated, the parameters were optimized to produce the SiC_p reinforced metal matrix composites(MMC) modified layer on AA6061 alloy surface. After being treated, the modified layer is crack-free, porosity-free, and has good metallurgical bond with the substrate. The microstructure and chemical composition of the modified layer were analyzed by such detection devices as scanning electronic microscope(SEM-EDX) and X-ray diffractometer(XRD). The performance of electrochemical corrosion and cavitation erosion and their mechanism were estimated by the microhardness tester, potentiostat and (ultrasonic-)(induced) cavitation device. 展开更多
关键词 铝合金 激光镀膜 金属模版复合物 粒子加固 气蚀酌
下载PDF
Effect of ball milling time on microstructures and mechanical properties of mechanically-alloyed iron-based materials 被引量:1
5
作者 刘东华 刘咏 +4 位作者 赵大鹏 王岩 方京华 温玉仁 刘祖铭 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第5期831-838,共8页
The microstructures and mechanical properties of an iron-based alloy (Fe-13Cr-3W-0.4Ti-0.25Y-0.30O) prepared by mechanical alloying were investigated with scanning electron microscope,optical microscope,X-ray diffract... The microstructures and mechanical properties of an iron-based alloy (Fe-13Cr-3W-0.4Ti-0.25Y-0.30O) prepared by mechanical alloying were investigated with scanning electron microscope,optical microscope,X-ray diffractometer and hardness tester.The results show that the particle size does not decrease with milling time because serious welding occurs at 144 h.The density of the alloy sintered at 1 523 K is affected by the particle size of the powder.Finer particles lead to a high sintered density,while the bulk density by using particles milled for 144 h is as low as 70%.In the microstructures of the annealed alloy,large elongated particles and fine equiaxed grains can be detected.The elongated particle zone has a higher microhardness than the equiaxed grain area in the annealed alloys due to the larger residual strain and higher density of the precipitated phase. 展开更多
关键词 iron-based alloy powder mechanical alloying MICROSTRUCTURE elongated particles equiaxed grain residual strain
下载PDF
TiB_(2)颗粒增强6061铝合金的组织及力学性能
6
作者 郝志飞 刘志伟 +6 位作者 解佩佩 余申卫 何源 董其娟 魏作山 李政霖 尚金翅 《热加工工艺》 北大核心 2024年第5期136-141,146,共7页
TiB_(2)颗粒对铝合金有良好的强化作用。通过超声辅助重熔稀释法制备TiB_(2)/6061复合材料,研究了TiB_(2)颗粒对铸态及挤压T6热处理态6061铝合金的微观组织及力学性能的影响。研究结果表明:添加2wt%TiB2颗粒后,铸态平均晶粒尺寸从未添加... TiB_(2)颗粒对铝合金有良好的强化作用。通过超声辅助重熔稀释法制备TiB_(2)/6061复合材料,研究了TiB_(2)颗粒对铸态及挤压T6热处理态6061铝合金的微观组织及力学性能的影响。研究结果表明:添加2wt%TiB2颗粒后,铸态平均晶粒尺寸从未添加TiB_(2)的355.7μm细化至117.5μm;TiB_(2)颗粒可以促进再结晶过程中的形核,并抑制晶粒长大;挤压热处理态TiB_(2)/6061复合材料的屈服强度为330 MPa、抗拉强度为385 MPa,相比未添加TiB_(2)的合金分别提高了11.8%和7.0%,其主要强化方式为热错配强化和Orowan强化。 展开更多
关键词 TiB_(2)颗粒增强铝基复合材料 6061铝合金 热挤压 热处理
下载PDF
连接金具用Q235钢表面激光合金化耐磨耐蚀涂层的组织及性能研究
7
作者 周海飞 李凤瑞 +4 位作者 王河 钱大虎 余璐涛 迟一鸣 姚建华 《表面技术》 EI CAS CSCD 北大核心 2024年第21期208-219,共12页
目的解决电网连接金具存在的硬度低、耐磨性差、易腐蚀失效等问题。方法采用激光合金化工艺在常见连接金具材料Q235钢表面制备均匀致密的K500涂层和K500+WC复合涂层,研究涂层的物相组成、微观组织、WC颗粒的溶解析出行为,并对其耐磨性... 目的解决电网连接金具存在的硬度低、耐磨性差、易腐蚀失效等问题。方法采用激光合金化工艺在常见连接金具材料Q235钢表面制备均匀致密的K500涂层和K500+WC复合涂层,研究涂层的物相组成、微观组织、WC颗粒的溶解析出行为,并对其耐磨性能和耐蚀性能进行分析。结果K500涂层由γ-(Fe,Ni,Cu)单相固溶体组成,其组织结构从底部到顶部经历了从平面晶向柱状晶、枝晶,最后到顶部等轴晶的转变。K500+WC涂层主要由γ相固溶体、WC、W2C组成,在熔池中WC颗粒边缘溶解,形成了几微米的元素扩散区域,该区域内析出枝晶状、块状碳化物,熔池底部富Fe元素区域还析出了鱼骨状Fe3W3C碳化物。K500涂层和K500+WC涂层的平均显微硬度分别为244.73HV0.2、355.27HV0.2,磨损率分别比基材降低了41.48%、85.39%,耐磨性能显著提升,这得益于γ相的固溶强化及碳化物的弥散强化效应。结论K500涂层中的Ni、Cu等元素在腐蚀初期会形成致密的氧化膜,将涂层与腐蚀性介质隔离,有效降低了腐蚀速率。加入WC颗粒后,耐蚀性良好的γ相含量降低,涂层内部微界面增多、腐蚀通道增加,导致K500+WC涂层的耐蚀性略微降低,但仍明显优于基材。 展开更多
关键词 激光合金化 电网连接金具 WC颗粒 耐磨性能 耐腐蚀性能
下载PDF
间隙原子及颗粒对激光增材制造高熵合金微观结构与力学性能影响的研究进展
8
作者 高宏亮 苏海军 +4 位作者 郭一诺 杨培鑫 夏乐 张卓 郭敏 《航空制造技术》 CSCD 北大核心 2024年第8期54-63,75,共11页
近年来,高熵合金(HEAs)由于其独特的多主元设计理念和优异的性能获得了研究者的广泛关注。激光增材制造能够获得具有超细晶和多尺度结构的高熵合金,使其具有优异的力学性能。同时间隙原子的掺杂及增强颗粒的添加有助于进一步改善合金的... 近年来,高熵合金(HEAs)由于其独特的多主元设计理念和优异的性能获得了研究者的广泛关注。激光增材制造能够获得具有超细晶和多尺度结构的高熵合金,使其具有优异的力学性能。同时间隙原子的掺杂及增强颗粒的添加有助于进一步改善合金的强塑性,在航空航天高性能结构材料等领域应用前景开阔。基于此,首先介绍了选区激光熔化技术和激光定向能量沉积技术的原理和特点;然后,总结了间隙原子(C、B、N)及增强颗粒对激光增材制造高熵合金微观组织及力学性能的影响,并分析了各个间隙原子及增强颗粒对合金的强塑化机理;最后对激光增材制造高强塑性高熵合金的发展前景做了展望。 展开更多
关键词 激光增材制造高熵合金 间隙原子 增强颗粒 微观组织 力学性能
下载PDF
基于神经网络的电弧增材制造铝合金力学性能预测
9
作者 张子琪 周祥曼 +3 位作者 郑事成 李波 李立军 付君健 《精密成形工程》 北大核心 2024年第1期43-51,共9页
目的预测不同工艺参数下电弧增材制造铝合金的力学性能。方法通过实验建立了电弧增材制造6061铝合金及TiC增强6061铝合金力学性能的数据集,并建立了一种以焊接电流、焊接速度、脉冲频率、TiC颗粒含量为输入,以屈服强度和抗拉强度为输出... 目的预测不同工艺参数下电弧增材制造铝合金的力学性能。方法通过实验建立了电弧增材制造6061铝合金及TiC增强6061铝合金力学性能的数据集,并建立了一种以焊接电流、焊接速度、脉冲频率、TiC颗粒含量为输入,以屈服强度和抗拉强度为输出的神经网预测模型,对比了反向传播神经网络(BP)、粒子群算法优化BP神经网络(PSO-BP)、遗传算法优化BP神经网络(GA-BP)3种预测模型的精度。结果与BP模型和PSO-BP模型相比,GA-BP预测模型具有更好的预测精度。其中,GA-BP模型预测6061铝合金屈服强度最佳结果的相关系数(R)为0.965,决定系数(R2)为0.93,平均绝对误差(Mean Absolute Error,MAE)为2.35,均方根误差(Root Mean Square Error,RMSE)为2.67;预测TiC增强的6061铝合金抗拉强度最佳结果的R=1,R2高达0.99,MAE为0.46,RMSE为0.49,GA-BP具有良好的预测精度。结论BP、PSO-BP、GA-BP3种神经网络模型可以用来预测电弧增材制造铝合金的力学性能,GA-BP模型比其他2种模型的预测精度更优。与传统的实验方法相比,用神经网络模型预测电弧增材制造铝合金力学性能的速度更快,成本更低。 展开更多
关键词 6061铝合金 TiC增强的6061铝合金 BP神经网络 粒子群算法 遗传算法 力学性能
下载PDF
Solid fraction evolution characteristics of semi-solid A356 alloy and in-situ A356–TiB_2 composites investigated by differential thermal analysis 被引量:2
10
作者 S.Deepak Kumar A.Mandal M.Chakraborty 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第4期389-394,共6页
The key factor in semi-solid metal processing is the solid fraction at the forming temperature because it affects the microstructure and mechanical properties of the thixoformed components. Though an enormous amount o... The key factor in semi-solid metal processing is the solid fraction at the forming temperature because it affects the microstructure and mechanical properties of the thixoformed components. Though an enormous amount of data exists on the solid fraction-temperature re- lationship in A356 alloy, information regarding the solid fraction evolution characteristics of A356-TiB2 composites is scarce. The present article establishes the temperature-solid fraction correlation in A356 alloy and A356-xTiB2 (x = 2.5wt% and 5wt%) composites using dif- ferential thermal analysis (DTA). The DTA results indicate that the solidification characteristics of the composites exhibited a variation of 2℃ and 3℃ in liquidus temperatures and a variation of 3℃ and 5℃ in solidus temperatures with respect to the base alloy. Moreover, the eutectic growth temperature and the solid fraction(fs) vs. temperature characteristics of the composites were found to be higher than those of the base alloy. The investigation revealed that in-situ formed TiB2 particles in the molten metal introduced more nucleation sites and reduced undercooling. 展开更多
关键词 particle reinforced composites aluminum alloys titanium boride CASTING solid fraction differential thermal analysis
下载PDF
CuCr bulk alloy produced by mechanical alloying and explosive compaction 被引量:1
11
作者 赵铮 李晓杰 +1 位作者 陶钢 杜长星 《中国有色金属学会会刊:英文版》 CSCD 2009年第S3期626-629,共4页
CuCr bulk alloy was produced by mechanical alloying and explosive compaction technology. Four kinds of milling time were used to analyze the function and influence on mechanical alloying. The samples were characterize... CuCr bulk alloy was produced by mechanical alloying and explosive compaction technology. Four kinds of milling time were used to analyze the function and influence on mechanical alloying. The samples were characterized by X-ray diffraction and optical microscope, and the density and hardness of the four samples were detected. The results show that the CuCr grain size is decreased with the milling time increasing, and nano-crystalline is observed in both Cu and Cr phase after 20 h milling. The density and hardness of samples are also increased with the increase of the milling time, so that the sample relative density reaches 96.6% and hardness reaches HV 217. The results indicate that high quality of CuCr bulk alloy can be manufactured using explosive compaction method when mechanical alloying and explosive compaction process parameters are reasonably selected. 展开更多
关键词 EXPLOSIVE COMPACTION mechanical alloyING CUCR alloy particle-reinforced composite
下载PDF
Microstructure and high-temperature wear properties of in situ TiC composite coatings by plasma transferred arc surface alloying on gray cast iron 被引量:1
12
作者 Hang Zhao Jian-jun Li +3 位作者 Zhi-zhen Zheng Ai-hua Wang Qi-wen Huang Da-wen Zeng 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第12期1273-1282,共10页
In this work, an in situ synthesized TiC-reinforced metal matrix composite (MMC) coating of approximately 350-400μm thickness was fabricated on a gray cast iron (GCI) substrate by plasma transferred arc (PTA) s... In this work, an in situ synthesized TiC-reinforced metal matrix composite (MMC) coating of approximately 350-400μm thickness was fabricated on a gray cast iron (GCI) substrate by plasma transferred arc (PTA) surface alloying of Ti-Fe alloy powder. Microhard- ness tests showed that the surface hardness increased approximately four-fold after the alloying treatment. The microstructure of the MMC coating was mainly composed of residual austenite, acicular martensite, and eutectic ledeburite. Scanning electron microscopy (SEM) and X-ray diffraction analyzes revealed that the in situ TiC particles, which were formed by direct reaction of Ti with carbon originally contained in the GCI, was uniformly distributed at the boundary of residual anstenite in the alloying zone. Pin-on-disc high-temperature wear tests were performed on samples both with and without the MMC coating at room temperature and at elevated temperatures (473 K and 623 K), and the wear behavior and mechanism were investigated. The results showed that, after the PTA alloying treatment, the wear resistance of the sam- ples improved significantly. On the basis of our analysis of the composite coatings by optical microscopy, SEM with energy-dispersive X-ray spectroscopy, and microhardness measurements, we attributed this improvement of wear resistance to the transformation of the microstruc- ture and to the presence of TiC particles. 展开更多
关键词 gray cast iron composite coatings particle-reinforced composites titanium carbide surface alloying MICROSTRUCTURE WEAR
下载PDF
Influence of filler materials on microstructure and mechanical properties of MGH956 alloy in TIG welding
13
作者 雷玉成 赵凯 +1 位作者 朱强 黄巍 《China Welding》 EI CAS 2012年第4期59-64,共6页
In order to improve the mechanical properties of MGH956 alloy fusion weZding joint, two kinds of self-made materials were used as filler materials to MGH956 alloy for TIG welding respectively. Microstracture and tensi... In order to improve the mechanical properties of MGH956 alloy fusion weZding joint, two kinds of self-made materials were used as filler materials to MGH956 alloy for TIG welding respectively. Microstracture and tensile fracture of joints were researched by scanning electron microscope(SEM). Reinforced particles were researched by SEM, X-ray diffraction ( XRD ) and energy dispersive X-ray spectrometry (EDS). These results were compared with joint which is filled with base materials. The results show that new reinforced phases such as TiC, TiN, Ni3Al and A1Ni are produced in the weld metal zone with two kinds of self-made materials as filler materials. The size of these reinforcements is about 1 μm, and the distribution of particles is very uniform in the matrix. The number of pores is reduced. Agglomerate Al-Y-O composite oxides are correspondingly decreased compared to the joint filled with base material. Thus, welded joint perormanee is enhanced. The average room temperature tensile strength of joints are 581 MPa and 607 MPa respectively. The fracture of joints both in general exhibit brittle fracture. 展开更多
关键词 MGH956 alloy TIG welding MICROSTRUCTURE metallurgy mechanism reinforce particles mechanical properties
下载PDF
SiC颗粒增强6013铝基复合材料时效析出行为及力学性能 被引量:1
14
作者 傅定发 彭克成 +4 位作者 陈爽 刘海洋 滕杰 蒋福林 张辉 《湖南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2023年第6期137-143,共7页
采用球磨-冷等静压-热等静压-热挤压工艺制备组织均匀、颗粒分散良好的15%质量比SiC_(p)/6013Al复合材料,并利用扫描电子显微镜、透射电子显微镜和室温力学性能测试等研究不同人工时效温度下SiC_(p)/6013Al复合材料的析出行为和力学性能... 采用球磨-冷等静压-热等静压-热挤压工艺制备组织均匀、颗粒分散良好的15%质量比SiC_(p)/6013Al复合材料,并利用扫描电子显微镜、透射电子显微镜和室温力学性能测试等研究不同人工时效温度下SiC_(p)/6013Al复合材料的析出行为和力学性能.结果表明,复合材料析出行为受热扩散控制,温度升高导致沉淀相析出加速;复合材料中的主要强化相为Mg_(2)Si,而且SiC颗粒能显著增强强度,但也导致复合材料的塑性快速下降;相比基体6013铝合金,15%质量比SiC_(p)/6013Al复合材料能在更低温度、更短时间内达到峰时效,经过人工时效处理后的最高硬度为180 HV_(0.2),抗拉强度为522 MPa. 展开更多
关键词 析出强化 力学性能 AL-MG-SI-CU合金 颗粒增强铝基复合材料 人工时效
下载PDF
YG8颗粒对原位铁基金属陶瓷组织和性能的影响 被引量:2
15
作者 程军 胡宇 +1 位作者 杨吉春 范明洋 《兵器材料科学与工程》 CAS CSCD 北大核心 2023年第5期51-57,共7页
针对油砂分离旋流器内衬材料耐磨性不足的问题,采用自蔓延高温合成与真空消失模铸造相结合的方法,制备原位TiC颗粒增强高铬铸铁基金属陶瓷复合材料,用显微组织观察、微区成分分析、XRD、显微硬度和干砂橡胶轮磨损试验等测试方法,研究了... 针对油砂分离旋流器内衬材料耐磨性不足的问题,采用自蔓延高温合成与真空消失模铸造相结合的方法,制备原位TiC颗粒增强高铬铸铁基金属陶瓷复合材料,用显微组织观察、微区成分分析、XRD、显微硬度和干砂橡胶轮磨损试验等测试方法,研究了不同YG8硬质合金颗粒加入量对TiC颗粒增强高铬铸铁基金属陶瓷复合材料组织和性能的影响。结果表明:复合层与高铬铸铁基体呈现“啮合”状态的冶金结合,复合层组织由原位合成的TiC、YG8颗粒相及高铬铸铁基体相组成;随YG8颗粒加入量的增加,原位合成的TiC颗粒尺寸变得细小,并弥散分布在高铬铸铁基体中;当YG8颗粒加入量为10%时,复合层表面质量良好,显微硬度值最高,可达1348HV_(0.1),其磨损失质量最小,在45、90、130 N载荷下的耐磨性分别是高铬铸铁基体的3.23、3.40、3.26倍。 展开更多
关键词 自蔓延高温合成 硬质合金 颗粒增强复合材料 金属陶瓷
下载PDF
Grain size refinement of magnesium composite alloys by addition of B_2O_3
16
作者 卜乐平 S.TANAKA +2 位作者 M.TSUSHIDA S.ANDO H.TONDA 《中国有色金属学会会刊:英文版》 CSCD 2006年第A03期1864-1869,共6页
The high performance magnesium alloy was investigated by adding B2O3 in magnesium and magnesium alloys. Experiments include adding B2O3 in Mg, Mg-Al and Mg-RE alloys, respectively, studying the effects of B2O3 on the ... The high performance magnesium alloy was investigated by adding B2O3 in magnesium and magnesium alloys. Experiments include adding B2O3 in Mg, Mg-Al and Mg-RE alloys, respectively, studying the effects of B2O3 on the microstructure, were studied measuring the change of grain size and microhardness of the materials, discussing the change of grain size, morphology and distribution. The results show that adding 3% or 6%(mass fraction) B2O3 in Mg can bring twinning in Mg, adding B2O3 in Mg-Al alloys and Mg-RE alloys can refine the alloy grain size. Adding 3%B2O3 in Mg-6Al alloys can refine the average grain size by about 5μm, with the average hardness increased by 13.3% (53.3-60.4 HV0.03); adding 6%B2O3 in Mg-6Al alloys can refine the average grain size by about 13μm, with the average hardness increased by 15.8% (53.3-61.73 HV0.03); adding 3% and 6%B2O3 into Mg-6RE alloys can refine the grain size by about 5 and 9μm, respectively, with the average hardness decreased to HV0.03 64.66 and HV0.03 57.86, respectively from HV0.03 88.57. In the Mg-6Al alloy the content of aluminum is increased, while in the Mg-6RE alloy the content of oxygen is decreased. It can be concluded that it is beneficial to develop Mg-Al-B-O particle reinforce composite alloys, and it is feasible to develop nanometer crystallization of block material by Mg-B-O-RE. 展开更多
关键词 应变分析 镁合金 金属化合物 金属铸造
下载PDF
固相合成纳米级xSiC/Mg-5.5Zn-0.1Y合金组织及力学性能
17
作者 彭二宝 马骁 《粉末冶金技术》 CAS CSCD 北大核心 2023年第2期149-153,共5页
通过固相合成的方法制备纳米级SiC颗粒增强Mg-5.5Zn-0.1Y合金,研究了SiC颗粒质量分数对Mg-5.5Zn-0.1Y合金组织及力学性能的影响。结果表明:随着SiC颗粒质量分数的提高,SiC颗粒分布状态变得更团聚,产生了明显的钉扎作用,具有显著细化晶... 通过固相合成的方法制备纳米级SiC颗粒增强Mg-5.5Zn-0.1Y合金,研究了SiC颗粒质量分数对Mg-5.5Zn-0.1Y合金组织及力学性能的影响。结果表明:随着SiC颗粒质量分数的提高,SiC颗粒分布状态变得更团聚,产生了明显的钉扎作用,具有显著细化晶粒的效果。SiC颗粒附近区域产生了大量位错,为添加质量分数2.0%SiC颗粒的Mg-5.5Zn-0.1Y合金再结晶形核提供有利条件,促进晶粒细化。提高SiC颗粒质量分数,合金硬度增大,加入质量分数2.0%SiC颗粒时,合金获得了最高硬度(HV 82)。提高SiC颗粒质量分数,降低了合金裂纹数量,SiC颗粒和Mg-5.5Zn-0.1Y合金发生界面脱粘现象,形成裂纹源并引起断裂。提高SiC颗粒质量分数能够使合金获得更高的强度与伸长率。 展开更多
关键词 固相合成 镁合金 颗粒增强 显微组织 力学性能
下载PDF
铝合金激光增材制造材料体系研究现状 被引量:5
18
作者 俞亮 刘永业 赵阳 《表面技术》 EI CAS CSCD 北大核心 2023年第3期35-51,共17页
首先概述了3种激光增材制造的成形技术原理,对其成形件的主要性能进行了比较。其次重点论述了近年来铝硅系、铝铜系和铝锌系铝合金以及颗粒增强铝基复合材料4种铝合金粉末材料体系的研究发展情况。在此基础上,探讨了铝基粉末在激光增材... 首先概述了3种激光增材制造的成形技术原理,对其成形件的主要性能进行了比较。其次重点论述了近年来铝硅系、铝铜系和铝锌系铝合金以及颗粒增强铝基复合材料4种铝合金粉末材料体系的研究发展情况。在此基础上,探讨了铝基粉末在激光增材制造应用中存在的一些难点,包括粉末流动性差、反射率和导热率高、极易氧化以及成形件产生微裂纹,介绍了解决或改善这些问题的方法和作用机制。最后归纳总结了现有铝合金在激光增材制造中仍需解决的问题,对今后的研究工作进行了展望,提出未来可以进行更多元素体系的陶瓷增强颗粒研究,并开发增强颗粒/铝基粉末智能匹配系统的展望,即能够科学选择出与激光增材制造所用铝基粉末高度匹配的增强颗粒,以及研发铝合金激光复合增材技术,以期为铝合金激光增材制造材料体系的发展研究提供有价值的参考。 展开更多
关键词 激光增材制造 铝合金 材料体系 增强颗粒 综合性能
下载PDF
In situ TiN-reinforced CoCr2FeNiTi(0.5) high-entropy alloy composite coating fabricated by laser cladding 被引量:16
19
作者 Ya-Xiong Guo Qi-Bin Liu Xiao-Juan Shang 《Rare Metals》 SCIE EI CAS CSCD 2020年第10期1190-1195,共6页
The fcc structural CoCr2 FeNiTi(0.5) high-entropy alloy(HEA) composite coating with TiN particles reinforced was acquired by laser cladding on the commercial904 L stainless steels.The results show that phase structure... The fcc structural CoCr2 FeNiTi(0.5) high-entropy alloy(HEA) composite coating with TiN particles reinforced was acquired by laser cladding on the commercial904 L stainless steels.The results show that phase structure is mainly composed of fcc solid solution and TiN phases.The coating exhibits excellent structural stability below850℃.The microstructure consists of irregular dendrite and TiN particles.Transmission electron microscopy(TEM) results reveal that the close-packed plane of fcc phase is(111) with interplanar spacing of ~ 0.208 nm.The interface between TiN and fcc matrix is semi-coherent.And the angle of boundary between dendrite and matrix is ~ 65°.The hardness and corrosion resistance of coating have much improvement compared with those of substrate. 展开更多
关键词 TiN particle reinforced High-entropy alloy Semi-coherent interface Laser cladding
原文传递
超音速火焰喷涂制备铝基复合制动盘工艺及力学性能研究
20
作者 金鹏 高杰 +5 位作者 林子怡 杨清芸 刘培 姜凯 朱浩 苗健 《现代制造工程》 CSCD 北大核心 2023年第7期112-116,共5页
基于超音速火焰喷涂(High Velocity Oxygen Fuel,HVOF)技术,在7075高强铝合金表面制备出碳化钨(WC)颗粒来增强镍基合金的耐磨层,分别利用光学显微镜、扫描电镜对喷涂层及界面过渡区(Interface Transition Zone,ITZ)微观组织进行表征,技... 基于超音速火焰喷涂(High Velocity Oxygen Fuel,HVOF)技术,在7075高强铝合金表面制备出碳化钨(WC)颗粒来增强镍基合金的耐磨层,分别利用光学显微镜、扫描电镜对喷涂层及界面过渡区(Interface Transition Zone,ITZ)微观组织进行表征,技术制造分别使用显微硬度仪和万能试验机对喷涂层的显微硬度和抗剪强度进行测试,探求铝基复合制动盘超音速火焰喷涂工艺。结果表明,超音速火焰喷涂制备铝基复合制动盘的工艺参数为铝基合金表面WC颗粒含量为35%,氧油比约为3∶1,送粉量为80 g/min,喷涂距离为330 mm,入射速度为450 m/s,制动盘转速为7 r/min,氮气流量为10 L/min;铝基复合制动盘喷涂层微观组织为奥氏体基体上弥散分布着大量WC颗粒,致密度高达94%;喷涂层显微硬度约为1500HV,剪切强度约为147.3 MPa,满足制动盘力学性能要求。 展开更多
关键词 超音速火焰喷涂技术 铝基复合制动盘 7075高强铝合金 WC颗粒增强镍基合金耐磨层
下载PDF
上一页 1 2 6 下一页 到第
使用帮助 返回顶部