高应变剪切变形下Al-Si合金晶格取向偏差演化与晶粒细化

B. Gwalani, W. Fu, M. Olszta, J. Silverstein, Digvijay Yadav, Praveena Manimunda, A. Guzman, K. Xie, A. Rohatgi, S. Mathaudhu, Cynthia A. Powell, P. Sushko, Yulan Li, A. Devaraj
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引用次数: 13

摘要

通过固相加工过程中剧烈的塑性剪切变形,可以定制合金初始组织,实现不同程度的晶粒细化,提高力学性能。对铸态Al-xSi合金(x = 0,1,4 at %)进行了基于晶体塑性的晶粒取向错误建模和基于销盘摩擦学的亚表面剪切变形实验。通过计算和实验相结合的方法对变形后的显微组织进行分析,得出结论,硬Si相的初始体积分数增强了局部晶格取向错误的演变,导致在剧烈的塑性剪切变形过程中有效的晶粒细化。剪切变形诱导的纳米结构使加工合金的纳米压痕硬度提高了一倍以上。
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Lattice Misorientation Evolution and Grain Refinement in Al-Si Alloys Under High-Strain Shear Deformation
The starting alloy microstructure can be tailored to achieve varying degrees of grain refinement and enhance mechanical properties through severe plastic shear deformation during solid-phase processing. Crystal plasticity-based grain misorientation modeling, coupled with systematic pin-on-disk tribometry-based subsurface shear deformation experiments on as-cast Al-xSi alloys (x = 0, 1, 4 at %), was conducted. The post-deformation microstructural analysis, through a combined computational and experimental approach, conclusively shows that the initial volume fraction of the hard Si phase enhances the evolution of local lattice misorientation, leading to efficient grain refinement during severe plastic shear deformation. The shear-deformation–induced nanostructure resulted in more than double the nanoindentation hardness in the processed alloy.
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