Effect of Aging on Fracture Toughness and Stress Corrosion Cracking Resistance of Forged 7475 Aluminum Alloy

被引：0
|
作者：
李红英
机构：
[1] Ministry of Education
[2] Changsha 410083
[3] China Key Lab of Nonferrous Metal Materials Science and Engineering
[4] School of Materials Science and Engineering Central South University
来源：
Journal of Wuhan University of Technology(Materials Science) | 2007年 / 02期
关键词：
7475; alloy; two-stage aging; heat treatment; RRA treatment fracture toughness; stress corrosion;
D O I：
暂无
中图分类号：
TG136.1 []; TG172.9 [其他腐蚀];
学科分类号：
080502 ; 080503 ;
摘要：
The effects of two-stage aging and retrogression and reaging heat treatment on the fracture toughness and stress corrosion cracking resistance of 7475 alloy were studied.The fracture toughness,conductivity and strength of samples of nine groups under duplex aging conditions and three retrogression and reaging heat treatments were also measured.Incorporating the microstructure and property,we found that when the condition of the first order aging kept identical,the fracture toughness and stress corrosion cracking resistance increase with aging time and the second aging temperature.The optimal treatment conditions are (115℃×7h+185℃×13h)among all tested two-stage aging treatments.Although the 7475 alloy treated by RRA method shows the highest strength and its stress corrosion cracking resistance after twenty minutes retrogression can also reach the same level as those by the optimal treatment of(115℃×7h+185℃×13h),the fracture toughness is even low.
引用
收藏
页码：191 / 195
页数：5
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