Influence of retrogression temperature and time on the mechanical properties and exfoliation corrosion behavior of aluminium alloy AA7150

被引：171

作者：

Li, J. F. ^{[1
,2
]}

Birbilis, N. ^{[3
]}

Li, C. X. ^{[1
]}

Jia, Z. Q. ^{[1
]}

Cai, B. ^{[1
]}

Zheng, Z. Q. ^{[1
,2
]}

机构：

[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

[2] Minist Educ, Key Lab Nonferrous Met Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

[3] Monash Univ, Dept Mat Engn, ARC Ctr Excellence Design Light Met, Clayton, Vic 3800, Australia

来源：

MATERIALS CHARACTERIZATION | 2009年 / 60卷 / 11期

关键词：

AA7150; alloy; Retrogression and re-aging (RRA); Mechanical properties; Exfoliation corrosion; REAGING TREATMENTS; SCC-RESISTANCE; STRENGTH; MICROSTRUCTURE; AA7050; RRA;

D O I：

10.1016/j.matchar.2009.06.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The tensile properties, exfoliation corrosion behavior and microstructures of the retrogression and re-aging (RRA) treated aluminum (Al) alloy AA7150 were studied. AA7150 was retrogressed at different temperatures (175 degrees C, 185 degrees C and 195 degrees C) for various times. it is found that as the hardness of the retrogressed AA7150 approaches the near-peak condition, the corresponding RRA treated AA7150 possesses good exfoliation corrosion resistance without strength loss. By retrogressing at 175 degrees C, the retrogression time can be extended to 3 h, the RRA treated AA7150 possesses a strength as high as that of conventional AA7150-T6, and its exfoliation corrosion resistance is in the vicinity to that of AA7150-T73. This enhanced exfoliation corrosion resistance was associated with the more separated eta precipitates at the grain boundary. AA7150-T6 is mainly strengthened by fine GP zones with high number density, while the intra-grain micro-structure of AA7150-RRA retrogressed at 175 degrees C for 3 h is characterized by relatively coarse eta' precipitates. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：1334 / 1341

页数：8

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