激光冲击加载纯铜高应变率下剧烈塑性变形行为观察  

Observations of Severe Plastic Deformation of Copper under the High Strain Rate Induced by Laser Shock Processing

作　　者：王冠[1] 龙霓东[1] 王波 何卫锋[1] 沈晓骏[1] 

机构地区：[1]空军工程大学,等离子体动力学重点实验室,陕西西安710038 [2]93802部队,陕西武功712200

出　　处：《材料科学与工程学报》2015年第4期609-612,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51205406)

摘　　要：利用高能短脉冲激光冲击技术(LSP)得到产生剧烈塑性变形的纯铜组织,借助XRD、EBSD等技术和硬度仪研究分析了这种塑性变形行为。结果表明,对纯铜表面进行激光冲击能够实现表层晶粒细化,接近纳米级,晶粒大小为20nm^200nm,且作用区域显微硬度提高35%,效果显著。分析认为,在高能激光冲击作用下,靶材产生超高应变率和剧烈塑性变形,进而发生动态再结晶,致使表面晶粒纳米化。Severe plastic deformation layer was short pulse laser shock processing （LSP） technique. obtained over a copper sample using high energy and examined by using EDS,XRD and EBSD technique. The The plastic deformation of the treated region was results indicate that the grains in top layer could he refined to nanometer size, ranging from 20nm to 200nm, and the hardness increases by 35% compared with that after normal LSP. Under the loading conditions of LSP, the high strain rate and severe plastic deformation of target material were generated and the nanometer-sized grains were produced, which can be attributed to dynamic recrystallization.

关 键 词：激光 纯铜 剧烈塑性变形 数值计算 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]