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.
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