等离子蒸发制备的纳晶镍的压缩变形机理（英文）  

Compression Deformation Mechanisms of Nanocrystalline Ni Prepared by Plasma Evaporation Method

作　　者：朱荣涛[1] 李延锋[1] 

机构地区：[1]中国矿业大学,江苏徐州221116

出　　处：《稀有金属材料与工程》2016年第7期1654-1658,共5页Rare Metal Materials and Engineering

基　　金：Natural Science Foundation of Jiangsu Province(BK20130192);Fundamental Research Funds for the Central Universities(2012QNA11,2013RC13,2014YC08)

摘　　要：与传统粗晶金属材料相比,纳晶金属具有特殊的变形机理。为了探索纳晶金属的变形机理,以等离子蒸发结合热压烧结制备的块体纳晶镍为研究对象,进行了准静态压缩力学性能测试,并且利用XRD和TEM技术对试样压缩前和压缩后的微结构演化进行了研究。结果表明:块体纳晶镍表现出较高的压缩强度和较好的韧性,且强度和韧性均具有率相关性。同时,纳晶镍压缩变形后晶粒尺寸较压缩前减小,但其微应变增加。结合纳晶镍的力学行为和压缩过程中微结构的演化,预测晶界位错运动和晶界滑移的联合机制是块体纳晶镍压缩过程中塑性变形的主要机理。To investigate mechanical behaviors and deformation mechanisms of nanocrystalline materials,bulk nanocrystalline Ni samples were prepared by a plasma evaporation method combined with hot pressure sintering.The compressive mechanical properties of the bulk samples were tested under different quasi-static strain rates at room temperatures,and the evolution of the microstructure of the bulk sample before and after compression was studied.Results indicate that the bulk samples show a good combination of strength and ductility during the compressive testing.Meanwhile,the grain size of the compressed sample decreases compared with that of the sintered sample,while the microstrain of the grain increases after compression.Based on experimental results,it is can be inferred that both grain boundary dislocation glide and grain boundary sliding are the main deformation mechanisms for the bulk NC Ni samples.

关 键 词：块体纳晶镍 力学行为 变形机理 微结构 

分 类 号：TF125.212[冶金工程—粉末冶金] TB383.1[冶金工程—冶金物理化学]