Multiscale Characterization of a Polycrystalline Aggregate Subjected to Severe Plastic Deformation with the Finite Element Method
Multiscale Characterization of a Polycrystalline Aggregate Subjected to Severe Plastic Deformation with the Finite Element Method
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DOI：
10.2320/matertrans.mh201514
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发表时间：
2016-06
影响因子：
1.2
通讯作者：
I. Watanabe;D. Setoyama
中科院分区：
文献类型：
--
作者：
I. Watanabe;D. Setoyama
采用有限元分析方法再现了多晶骨料在剧烈塑性变形条件下的非均匀变形过程，用单晶塑性理论表征了非均匀变形的演化过程。对周期性多晶集合体进行了有限元分析，模拟了多道次等通道转角挤压变形过程，其宏观对数累积塑性应变达到250%以上。从宏观响应、晶体学取向的演化和微观结构的变形状态等多尺度角度对数值结果进行了分析。这项研究解决了nite元素离散化的重要性，再现多晶聚集体的非均匀变形，包括内部晶粒，这是一个关键因素，调查潜在的ne粒化机制。[doi：10.2320/matertrans.MH201514]
The heterogeneous deformation of a polycrystalline aggregate under severe plastic deformation was reproduced with nite element analysis by using single-crystal plasticity to characterize the evolution process of the heterogeneity. Finite element analyses of a periodic polycrystalline aggregate were carried out to simulate the deformation process corresponding to the multi-pass equal-channel angular extrusion process, which reached over 250% of the macroscopic logarithmic accumulated plastic strain. The numerical results were analyzed from multi-scale perspectives: the macroscopic response, evolution of the crystallographic orientation, and deformation state of the microstructure. This study addressed the importance of nite element discretization to reproduce the heterogeneous deformation of a polycrystalline aggregate, including that of the inside grains, which is a key element for investigating the underlying ne-graining mechanism. [doi:10.2320/matertrans.MH201514]