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学性能；动态回复；再结晶；织构 中图分类号:TG146.2 文献标志码:A Microstructure and mechanical properties of ultra-fine grain ZK60 magnesium alloy processed by equal channel angular pressing HE... single-step equal channel angular pressing (ECAP) processing and two-step ECAP processing. The microstructures and mechanical properties of the ZK60 magnesium alloys were investigated by optical microscopy......
,但其硬度和抗拉强度却有所下降.扫描电子显微镜和透射电子显微镜分析表明:经ECAP挤压后,原汉字状或骨骼状Mg_2Si相显著碎化,且挤压道次越多,Mg_2Si相的破碎效果越明显,合金组织也不断细化.对合金经较多道次挤压后硬度及抗拉强度反而有所下降的原因进行了分析. 关键词:Al-Mg_2Si合金; 等通道转角挤压; 微观组织; 力学性能; Al-Mg_2Si alloy; equal channel angular pressing (ECAP); microstructure; mechanical properties.; [全文内容正在添加中] ......
Technology, Huazhong University of Science and Technology, Wuhan 430074, China Received 9 July 2012; accepted 20 August 2012 Abstract: The equal channel angular pressing (ECAP) was used to make large...: magnesium alloy; AZ31 alloy; equal channel angular pressing; process parameter; grain refinement 1 Introduction Magnesium alloy as a new type of metal material has super high strength, super high stiffness......
等通道转角挤压过程中fcc金属的微观结构演化与力学性能吴世丁1,安祥海1,韩卫忠1,屈伸1,张哲峰1(1.辽宁省沈阳市科学院金属研究所沈阳材料科学国家(联合)实验室)摘 要:系统总结了面心立方(fcc)金属材料在等通道转角挤压(ECAP)变形后的晶粒细化,微观结构演化规律和力学性能.根据ECAP变形的特点,利用具有特殊取向的Al单晶体和Cu双晶体,经过一道次ECAP挤压发现:材料在ECAP模具对角面附近发生严重塑性变形;除了沿模具对角面切应力的作用外,沿垂直于模具对角面的切应力也起重要作用.此外,通过设计特殊取......
Abstract: The microstructure and mechanical properties of fine grained uranium prepared by equal channel angular pressing (ECAP) and subsequent intermediate heat treatment were investigated systematically... was drawn. Key words: depleted uranium; equal channel angular pressing (ECAP); heat treatment; grain refinement; severe plastic deformation 1 Introduction Equal channel angular pressing (ECAP......
TWIP效应分析胡超1,杨钢2,聂学青1,王向斌2,黄崇湘3(1.湖北省武汉市东方电气(武汉)核设备有限公司2.钢铁研究总院,北京 1000813.中国科学院 金属研究所,辽宁沈阳 110016)摘 要:对不同形变量下TWIP钢内部组织观察发现,在形变量由小到大的过程中,内部组织依次呈现为:大量位错,孪晶,多个孪生系统的交割.对比分析各形变量下组织情况可以发现TWIP效应过程主要有如下几点:孪晶对位错的阻塞作用,提高了局部加工硬化能力;孪晶与孪晶的作用,孪晶的形成增加了后续孪晶的阻力,其次多套孪生系统有效地对晶......
of microstructural evolution during equal-channel angular pressing [J]. Acta Mater, 1997, 45(11): 4733-4741. [15] CHEN T J, HAO Y, SUN J. Microstructural evolution of previously deformed ZA27 alloy during...-pass equal channel angular extrusion (ECAE) process was introduced into strain-induced melt activation (SIMA) to predeform a ZK60 alloy with rare earth (RE) addition. Microstructure evolution of ECAE......
-uniform shear deformation process in the cross-section of the workpiece. The different processing routes for equal round channel angular pressing process were conducted by using node mapping method in multi..., ZHAO Xi-cheng. Microstructure and grain refinement limit of 7475 aluminum alloy after equal-channel angular pressing[J]. The Chinese Journal of Nonferrous Metals, 2004, 14(9): 741-745. [5] Segal V M......
:A Microstructures of pure Al powder consolidate using equal channel angular pressing and torsion after single pass LI Ping, WANG Xiao-xi, XUE Ke-min, ZHANG Xiang, WANG Xue (School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China) Abstract: Pure Al particles were successfully consolidated into nearly dense bulk materials by equal channel angular pressing......
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