Fatigue fracture of high-strength Al-Zn-Mg-Cu alloy

被引：0

作者：

蹇海根 ^{[1
]}

姜锋 ^{[1
]}

文康 ^{[1
]}

蒋龙 ^{[1
]}

黄宏锋 ^{[1
]}

韦莉莉 ^{[1
]}

机构：

[1] School of Materials Science and Engineering,Central South University

来源：

Transactions of Nonferrous Metals Society of China | 2009年 / 19卷 / 05期

关键词：

Al-Zn-Mg-Cu alloy; fatigue fracture; fatigue crack propagation;

D O I：

暂无

中图分类号：

TG146.21 [];

学科分类号：

摘要：

X-ray diffractometry(XRD),optical microscopy(OM),scanning electron microscopy(SEM)were used to study the fatigue fracture of the T7451 Al-Zn-Mg-Cu alloy(470℃,60 min+115℃,8 h+165℃,16 h).The study reveals mainly the microscopic structure of the alloy in the process of crack formation and crack growth.The fatigue fracture is characterized by three zones:fatigue crack source zone,fatigue crack propagation zone and fatigue fracture zone.The fatigue damage preferably incubates at the fractured inclusion particles at or near(about 25μm)the specimen free surfaces,and these brittle Fe-rich intermetallic inclusion particles are (7-10)μm×(11-14)μm in size.Some features such as"feather-like","river and range"and boundary extrusions can be observed in the fatigue propagation zone,and in the fatigue fracture zone the surface is rough and uneven.

引用

页码：1031 / 1036

页数：6

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