论文标题
金属玻璃的非平衡塑料粗糙产生应变率和温度依赖性缩放指数的自我伴形构图
Nonequilibrium plastic roughening of metallic glasses yields self-affine topographies with strain-rate and temperature-dependent scaling exponents
论文作者
论文摘要
我们在最初平坦的Cu $ _ {50} $ zr $ _ {50} $金属玻璃使用大型分子动力学模拟的压缩塑料流中研究非平衡粗糙度。粗糙度出现在玻璃屈服点以外的原子平坦接口处。自我效果粗糙的地形印在产量时，并在随后的变形期间得到加固。印迹的地形具有赫斯特指数，随着应变率和温度的升高而降低。产量后，均方根粗糙度振幅随着预制剂的施加应变的平方根而生长，前提因素也随着应变率和温度的增加而下降。我们的计算揭示了在塑性流量期间与均质样品的空间幂律相关性与取决于变形和温度速率的指数的出现。结果对解释和工程粗糙度概况有影响。
We study nonequilibrium roughening during compressive plastic flow of initially flat Cu$_{50}$Zr$_{50}$ metallic glass using large-scale molecular dynamics simulations. Roughness emerges at atomically flat interfaces beyond the yield point of the glass. A self-affine rough topography is imprinted at yield and is reinforced during subsequent deformation. The imprinted topographies have Hurst exponents that decrease with increasing strain-rate and temperature. After yield, the root-mean-square roughness amplitude grows as the square-root of the applied strain with a prefactor that also drops with increasing strain-rate and temperature. Our calculations reveal the emergence of spatial power-law correlations from homogeneous samples during plastic flow with exponents that depend on the rate of deformation and the temperature. The results have implications for interpreting and engineering roughness profiles.
