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  4. 剧烈塑性变形对块体纳米金属材料结构和力学性能的影响

金属学报, 2014, 50(2): 156-168. doi: 10.3724/SP.J.1037.2013.00616

剧烈塑性变形对块体纳米金属材料结构和力学性能的影响

倪颂 1, , 廖晓舟 2, , 朱运田 3,

1.中南大学粉末冶金国家重点实验室,长沙,410083

2.School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney,Sydney, NSW 2006, Australia

3.Department of Materials Science & Engineering, North Carolina State University,Raleigh, NC 27659-7919, USA

基金项目:   National Natural Science Foundation of China(51301207)   国家自然科学基金项目51301207和中国博士后科学基金项目2013M531806资助   China Postdoctoral Science Foundation(2013M531806)  

关键词： 剧烈塑性变形 , 纳米材料 , 位错 , 孪晶 , 应变强化 , 应变软化

EFFECT OF SEVERE PLASTIC DEFORMATION ON THE STRUCTURE AND MECHANICAL PROPERTIES OF BULK NANOCRYSTALLINE METALS

Keywords： severe plastic deformation , nanocrystalline material , dislocation , twin , strain hardening , strain softening

综述了剧烈塑性变形引起的块体纳米金属材料的结构和力学性能演变.以电化学沉积法制备的fee结构纳米晶Ni-20％Fe(质量分数)合金为研究对象,通过对其进行不同应变量的高压扭转实验,系统分析了变形引起的结构和力学性能演变.结构表征结果表明:(1)变形引发纳米晶Ni-Fe合金晶粒旋转,实现晶粒长大.同时,晶粒长大过程伴随着位错密度、孪晶密度的演变;(2)存在一个最有利于变形孪晶生成的晶粒尺寸范围(45～100 nm),在这个晶粒尺寸范围之外,去孪晶起主导作用使原有的生长孪晶或变形孪晶消失;(3)位错密度是影响位错与孪晶反应的新的影响因素.当发生孪晶的晶粒内位错密度低时,位错可完全穿过孪晶界,部分穿过孪晶界,或被孪晶界吸收;发生孪晶的晶粒内位错密度高时,大量位错缠绕并堆积在孪晶界附近,形成应力集中,破坏孪晶界原有的共格性.为释放局部应力,将从孪晶界的另一侧发射不全位错形成层错和二次孪晶;(4)在塑性变形导致的晶粒长大过程中,原先偏聚于消失了的晶界上的C和S沿残留晶界扩散并继续偏聚于晶界上.结构与力学性能关系结果表明:随着应变量的增加,应变强化、应变软化交替出现.位错密度对硬度的演变起主导作用,其它结构演变(如孪晶密度的变化和晶粒尺寸变化)对硬度的演变起次要作用.

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