Effect of minor Ge addition on microstructure and localized corrosion behavior of Al-Zn-Mg alloy sheet

被引：14
|
作者：
Liu, Shengdan [1 ,2 ,3 ]
Wang, Qing [1 ,2 ]
Yang, Zhenshen [1 ,2 ]
Chai, Wenru [1 ,2 ]
Chen, Jingchao [1 ,2 ]
Ye, Lingying [1 ,2 ,3 ]
Tang, Jianguo [1 ,2 ,3 ]
机构：
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Minist Educ, Key Lab Nonferrous Met Sci & Engn, Changsha 410083, Hunan, Peoples R China
[3] Nonferrous Met Oriented Adv Struct Mat & Mfg Coop, Changsha 410083, Hunan, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2019年 / 156卷
关键词：
Aluminum alloy; Germanium; Microstructure; Exfoliation corrosion; STIR WELDED-JOINTS; EXFOLIATION CORROSION; MECHANICAL-PROPERTIES; QUENCH SENSITIVITY; RECRYSTALLIZATION BEHAVIOR; INTERGRANULAR CORROSION; ALUMINUM-ALLOYS; GRAIN-STRUCTURE; CU ALLOY; STRENGTH;
D O I：
10.1016/j.matchar.2019.109837
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of minor Ge addition on microstructure and localized corrosion behavior of Al-Zn-Mg alloy sheet was investigated. Ge leads to the formation of Mg2Ge phase, which can stimulate recrystallization nucleus, and a higher density of smaller Al3Zr dispersoids, which can inhibit recrystallization effectively. Consequently, a lower recrystallization fraction and smaller recrystallized grains are obtained in the Ge-added sheet. Ge reduces the density of eta' strengthening precipitates in the interior of grains but increase the length and spacing of eta precipitates at grain boundaries. The corrosion potential is similar for Mg2Ge phase and the matrix, and therefore Mg2Ge phase and the matrix around it do not dissolve during immersion in NaCl solution. Corrosion immersion test and electrochemical test results show that Ge can improve exfoliation corrosion resistance. The reason has been discussed based on the modification of microstructure caused by Ge addition.
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收藏
页数：13
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