Effects of plastic energy on thixotropic microstructure of C5191 alloys during SIMA process
Effects of plastic energy on thixotropic microstructure of C5191 alloys during SIMA process
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DOI：
10.1016/j.jallcom.2017.05.245
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发表时间：
2017-10-15
影响因子：
6.2
通讯作者：
Zhang, Yisheng
中科院分区：
文献类型：
--
作者：
Cao, Miao;Zhang, Qi;Zhang, Yisheng
研究了旋转旋锻应变诱导熔体激活（SIMA）预变形对C5191铜合金显微组织和力学性能的影响。本文以塑性能作为评价材料储能价值的指标。利用FORGE 3D软件和积分方程对旋转旋锻（RS）过程进行了数值模拟，计算了不同条件下的塑性能。结果表明，RS的塑性能仅与坯料径向应变有关，且各道次的塑性能随RS道次的增加而减小。利用电子背散射衍射技术分析了旋锻材料和半固态材料中的孪生和位错分布。结果表明，在再结晶过程中，大角度晶界的迁移和缺陷的消除都发生了。在不同径向应变下制备了半固态C5191合金。研究发现，塑性能的增加，会缩短球形颗粒的形成时间。同时，高塑性能促进了球形晶粒的细化，颈晶数量的减少，硬度的提高。(C)2017 Elsevier B.V.版权所有。
This study was undertaken to investigate the influence of predeformation in "rotary swaging strain induced melt activation (SIMA) process on the microstructural characteristics and mechanical properties of C5191 copper alloy. In this paper, plastic energy was utilized as an indicator to assess the value of stored energy in materials. The plastic energy of rotary swaging (RS) under different conditions was calculated by numerical simulation using FORGE 3D software and integral equations. The results showed that the plastic energy of RS was only related to the billet radial strain, and the plastic energy of each pass reduced with the increasing of the RS passes number. The twinning and dislocation distributions in the rotary swaged materials and semi-solid materials were analyzed by the electron backscatter diffraction technique. These results illustrated the migration of high-angle boundaries were migrated and defects were removed during recrystallization. Semi-solid C5191 alloy were prepared under different radial strains. It was found that the increase of plastic energy, decrease the spherical grains formation duration. Meanwhile, the high plastic energy promoted the refinement of spherical grains, the reduction of neck grains number, and the enhancement of hardness. (C) 2017 Elsevier B.V. All rights reserved.