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Effects of processing parameters and Ca content on microstructure and mechanical propertie

 

论文名称

Effects of processing parameters and Ca content on microstructure and mechanical properties of squeeze casting AZ91-Ca alloys

发表期刊名称

Materials Science and Engineering A

简介

The microstructures and mechanical properties of Mg–xZn–1.25RE–Zr (x=3.5, 4.2, 5.0 wt%) and Mg–4.2Zn–yRE–Zr (y=1.0, 1.25, 1.5 wt%) alloys in as-cast and 325 °C peak-aged condition were investigated in this study. The as-cast Mg–xZn–yRE–Zr alloys consist of α-Mg matrix, T-phase and Mg51Zn20 phase. For Mg–xZn–1.25RE–Zr alloys, 4.2 wt% Zn addition led to smallest average grain size and better eutectics morphology of discontinuous network, short-bar and island shape. For Mg–4.2Zn–yRE–Zr alloy, increase in RE content gradually refined the microstructure and contributed to more triangular particles and networks. After peak-aged at 325 °C, the strengthening of MgxZnyREZr alloys occurred through the precipitations of rod-like β′1 phases. With Zn content from 3.5 to 5.0 wt%, the strengthening effect first increased and then decreased, with a turning point of 4.2 wt% Zn. The descend of strengthening effects at 5.0 wt% was mainly ascribed to the formation of plate-like β′2 phases and reduced number density of β′1 phases. With RE addition from 1.0 to 1.5 wt%, the strengthening effect increased because of the denser and finer β′1 phases. When x=4.2 and y=1.251.5 wt%, the MgxZnyREZr alloy reveals good combination of strength and elongation in 325 °C peak-aged condition, and was chosen as optimal chemical composition.

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发表时间

2014.01

影响因子

2.567

完成人

Yingdong Wang,  Guohua Wu*, Wencai Liu, Song Pang, Yang Zhang, Wenjiang Ding

联系人

吴国华

电话

13671800698

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