考虑引入预变形对加工硬化的影响,通过分子动力学方法研究了CuZr非晶合金在不同变形方式下的变形行为.结果表明,在三维拉伸的应力-应变曲线上可以看出试样没有显著的弹性和塑性变形行为;试样在单轴拉伸中,应变为6％左右达到屈服,屈服强度为2.0GPa,主剪切带的形成与扩展导致了试样灾难性的剪切断裂.引入预变形后,二十面体数量增加,体系具有较高的局部5次对称性(LFFS),剪切带之间的强烈作用使应变分布更均匀,避免了应变局域化,结果是:试样在变形过程中表现得更稳定,强度和塑性得到提高,没有出现剪切断裂.因此,引入预变形是加工硬化现象产生的主要原因.这些结果将有助于更深入地认识非晶合金室温塑性变形的内在机理.
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