纳米结构铜铝合金的绝热剪切破坏机制

来源 :2018第十二届全国爆炸力学学术会议 | 被引量 : 0次 | 上传用户:koutoumonnokoro
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  本文通过大塑性变形技术制备了具有不同层错能的纳米尺度面心立方(FCC)结构合金,并研究了其在高应变率、单轴压缩加载条件下的力学响应。研究结果表明:那些具有低层错能的合金更容易出现绝热剪切带,这是首次在公开文献中报导单轴动态压缩加载条件下FCC金属出现绝热剪切带。为了探究绝热剪切带形成的机制,首先研究了热软化在动态加载条件下的作用。为此,研究了在宽加载温度范围内以及一些中间加载状态下的动态响应。结果 表明:发生塑性失稳之前的绝热温升对于绝热剪切带形成的影响很小。
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