Effects of Mg Content on the Fatigue Strength and Fracture Behavior of Al-Si-Mg Casting Alloys

被引：20

作者：

Wu, Ming-Ze ^{[1
]}

Zhang, Ji-Wang ^{[1
]}

Zhang, Yan-Bin ^{[2
]}

Wang, Hua-Qiang ^{[1
]}

机构：

[1] Southwest Jiaotong Univ, State Key Lab Tract Power, Chengdu 610031, Sichuan, Peoples R China

[2] Southwest Jiaotong Univ, Sch Mech Engn, Chengdu 610031, Sichuan, Peoples R China

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2018年 / 27卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Al-7Si-Mg alloys; fatigue properties; fracture behavior; Mg content; S-N curve; CRACK GROWTH-CHARACTERISTICS; MECHANICAL-PROPERTIES; MICROSTRUCTURE; AL-7SI-MG; LIFE; ADDITIONS;

D O I：

10.1007/s11665-018-3688-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to investigate the influence of Mg content on the fatigue properties in Al-Si-Mg alloy, uniaxial tensile tests and rotating bending fatigue tests were conducted on two Al-7Si-Mg casting alloys, with different Mg contents of 0.3 and 0.6wt.%. The fracture surfaces of the specimens were observed by scanning electron microscopy, and the fatigue crack growth process was obtained by the replica method. The results indicate that the increase in Mg content enhances the yield strength and tensile strength of the alloy, whereas it reduces its elongation. There is an obvious knee point in the S-N curves of Al-7Si-0.6Mg alloy while that of Al-7Si-0.3Mg alloy shows continuous decrease. The fatigue strength at 5x10(5) cycles is 60MPa for Al-7Si-0.3Mg alloy and 80MPa for Al-7Si-0.6Mg alloy. For the two types of specimens, the fatigue failure can initiate from crystal slip and casting defects. The replica results suggest that cracks in Al-7Si-0.6Mg alloy grow more slowly than that in Al-7Si-0.3Mg alloy.

引用

页码：5992 / 6003

页数：12

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