Effect of trace zirconium addition on microstructure and mechanical properties of hypereutectic Al-20Si alloy

被引：0
|
作者：
Hu Z.-L. [1 ]
Han Z.-Y. [1 ]
Tang P. [1 ,2 ]
Wang K. [3 ]
机构：
[1] School of Resources, Environment and Materials, Guangxi University, Nanning
[2] Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning
[3] School of Mechanical Engineering, Dongguan University of Technology, Dongguan
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2019年 / 29卷 / 10期
关键词：
Al-20Si alloy; Mechanical properties; Refine and modification; Secondary phase; Trace zirconium;
D O I：
10.19476/j.ysxb.1004.0609.2019.10.06
中图分类号：
学科分类号：
摘要：
In this research, the effects of different zircon additions(0.15%, 0.3%, 0.45%, 0.6%, mass fraction) on the microstructure and mechanic properties of Al-20Si alloy were investigated using OM, SEM/EDS and XRD, and their strength and hardness were measured. The results show that the phenomenon of microstructure modifications are occurred when the zircon is added at trace amount. The coarse polyhedral and star like primary silicon are refined and modified to small polyhedral shape as well as be spherized. When the zircon addition of Al-20Si alloy is 0.3%, the effect of refine and modification is the most obvious. The length-diameter ratio of primary silicon is decreased from 1.71 to 1.26. The coarse silicon with flack/needle shape is changed to fine fiber shape dispersed on the matrix. The length of eutectic silicon decreases from 20.6 μm to 8.7 μm. From the XRD patterns, the Al4Si5Zr3 phase is formed owing to the zircon addition of Al-20Si alloy. The ultimate tensile strength increases from 89.4 MPa to 132.1 MPa, by 47.8%, and the elongation increases from 0.67% to 1.2%, by 79.1%. From the fracture surface, the promotions of mechanical properties are due to the dispersion and pinning reinforcement caused by the addition of trace zircon. © 2019, Editorial Office of Systems Engineering and Electronics. All right reserved.
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页码：2266 / 2276
页数：10
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