Microstructure-dependent mechanical properties of semi-solid copper alloys
Microstructure-dependent mechanical properties of semi-solid copper alloys
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DOI：
10.1016/j.jallcom.2017.03.360
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发表时间：
2017-08-25
影响因子：
6.2
通讯作者：
Zhang, Qi
中科院分区：
文献类型：
--
作者：
Cao, Miao;Wang, Zhao;Zhang, Qi
采用旋转旋锻应变诱导熔体激活（RSSIMA）法制备半固态铜合金。采用Lifshize-Slorovitze-瓦格纳（LSW）方程描述了等温热处理过程中球状颗粒的晶粒尺寸演变，采用幂律Holloman加工硬化模型分析了半固态铜合金和铸态铜合金的力学行为。研究了半固态锡铜合金组织变化对弹塑性性能的影响。结果表明，合金试样的硬度和强度随晶粒尺寸的减小而增加，而合金则是由不同的等温热处理工艺形成的。具有球状微晶粒的半固态试样的强度也被发现高于具有枝晶微晶粒的铸态铜的强度。这些机械性能的增强可以通过基于显微镜观察的第二相的细晶机制和沉淀强化来理解。这些结果对于半固态金属合金的应用是必不可少的。(C)2017由Elsevier B. V.出版
Rotary swaging strain induced melt activation (RSSIMA) method is proposed to fabricate semi-solid copper alloys. The micro-grains size evolution of the globular particles during isothermal heat treatments is described by the Lifshize-Slorovitze-Wagner (LSW) equation and mechanical behaviors of semisolid copper alloys and as-cast copper alloys are analyzed with the power-law Holloman work-hardening model. The effects of microstructure alteration on elasto-plastic properties of semi-solid tin copper alloys are reported. It has been discovered that the stiffness and strength of the alloy samples increase as micro-grain sizes decrease, whereas the alloys originated from various isothermal heat treatments. The strength of the semi-solid samples with globular micro-grains is also discovered to be higher than the strength of as-cast copper with dendrite micro-grains. These enhancements in mechanical properties can be understood by fine-grain mechanisms and precipitation strengthening of the second phase based on microscopy observations. These results can be essential for applications of semi-solid metal alloys. (C) 2017 Published by Elsevier B.V.