PHASE FIELD MODEL FOR MICROSTRUCTURE EVOLUTION OF SUBGRAIN IN DEFORMATION ALLOY

doi:10.3724/SP.J.1037.2012.00265

Acta Metall Sin

2012, Vol. 48

Issue (10): 1215-1222 DOI: 10.3724/SP.J.1037.2012.00265

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PHASE FIELD MODEL FOR MICROSTRUCTURE EVOLUTION OF SUBGRAIN IN DEFORMATION ALLOY

GAO Yingjun ^1,2,3, LUO Zhirong ^1,2, HUANG Lilin ^1,2, HU Xiangying ²

1. Key Lab of Engineering Disaster Prevention and Structural Safety of China Ministry of Education, Guangxi University, Nanning 530004
2. College of Physics Science and Engineering, Guangxi University, Nanning 530004
3. International Center for Materials Physics, Chinese Academy of Science, Shenyang 110016

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GAO Yingjun LUO Zhirong HUANG Lilin HU Xiangying. PHASE FIELD MODEL FOR MICROSTRUCTURE EVOLUTION OF SUBGRAIN IN DEFORMATION ALLOY. Acta Metall Sin, 2012, 48(10): 1215-1222.

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Abstract

It is well know that static recrystallization (SRX), which occurs during post–deformation annealing, is greatly affected by the deformation formed during cold working. Therefore, to investigate and predict the SRX microstructure and SRX texture numerically with high accuracy, it is necessary to simulate the SRX process taking the deformation microstructure into consideration. A model that couples the crystal plasticity finite element method and microstructure evolution model is believed to be the most promising approach for SRX microstructure design. In this paper, the subgrain structure evolution is firstly studied by using the multi–state phase field (MSPF) model coupling with the lattice deformation model including the stored energy distribution of deformed alloy. The initial subgrain growth through the mechanism of mergence and swallow during recrystallization process are simulated by MSPF. The different amount of deformation effecting on subgrain distribution and subgrain growth rate are studied systematically. The calculated results show that in the region with higher stored energy, for example, around grain boundaries, there are very dense finer subgrains which recrystallize earliestly in the higher stored energy region during recrystallization process, and grow up by mergencing and swallowing, while the distribution of subgrains inside the deformation grain is relative uniform and with relative large subgrains which grow up slowly. The distribution of grains obtained by the weighted frequency shows that the grain distribution changes from small to large grain is fast for the larger deformed alloy, while the change is slow for the less deformed alloy. All the results are agreement with experimental ones.

Key words: phase field model subgrain plastic deformation Mg--based alloy

Received: 10 May 2012

ZTFLH:

TG115

Fund:

Supported by National Science Foundation of China (Nos.51161003 and 50661001)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00265 OR https://www.ams.org.cn/EN/Y2012/V48/I10/1215

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