Effects of High-intensity Ultrasonic Treatment on Microstructure and Mechanical Properties of Hypereutectic Al-20Si Alloy

Yang Jun; Cheng Hefa; Huang Xiaomei; Xiao Zhiling; Liu Ming

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Effects of High-intensity Ultrasonic Treatment on Microstructure and Mechanical Properties of Hypereutectic Al-20Si Alloy
Vol. 30, Issue 8, Pages: 769-771(2010)
Published： 2010 ，
DOI：

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[1]杨俊,程和法,黄笑梅,肖志玲,刘铭.高能超声对Al-20Si合金组织和力学性能的影响[J].特种铸造及有色合金,2010,30(08):769-771+685.

Yang Jun, Cheng Hefa, Huang Xiaomei, et al. Effects of High-intensity Ultrasonic Treatment on Microstructure and Mechanical Properties of Hypereutectic Al-20Si Alloy. [J]. Special Casting & Nonferrous Alloys 30(8):769-771(2010)
[1]杨俊,程和法,黄笑梅,肖志玲,刘铭.高能超声对Al-20Si合金组织和力学性能的影响[J].特种铸造及有色合金,2010,30(08):769-771+685. DOI：

Yang Jun, Cheng Hefa, Huang Xiaomei, et al. Effects of High-intensity Ultrasonic Treatment on Microstructure and Mechanical Properties of Hypereutectic Al-20Si Alloy. [J]. Special Casting & Nonferrous Alloys 30(8):769-771(2010) DOI：

摘要

采用高能超声波对Al-20Si合金进行熔体处理

研究超声波处理对Al-20Si合金微观组织形貌及其力学性能的影响。结果表明

在660℃温度下

对Al-20Si合金熔体进行高能超声波处理

可以使Al-20Si合金的初晶硅形貌由粗大的板片状逐渐变成细小的球状颗粒

圆整度高

分布均匀

并且使其抗拉强度和伸长率提高。通过对合金拉伸断口形貌的观察

发现在经过超声处理的Al-20Si合金断口上有较多的撕裂带和韧窝

表现为脆性断裂和韧性断裂的混合型断口。

Abstract

Effects of high-intensity ultrasonic treatment on microstructure and mechanical properties of hypereutectic Al-20Si alloy were investigated. The results reveal that primary Si phase in the Al-20Si alloy can be converted from coarse plate gradually into fine spherical particle with uniform distribution after high intensity ultrasonic treatment

which is responsible for the improvement of tensile strength and elongation of the alloy. Observation of tensile fracture morphology shows that tearing strips and dimples much occurs in the fracture of Al-20Si alloy treated by high intensity ultrasonic treatment

characterized by mixed fracture of brittle and toughness crack.