Combining pre-rolling with retrogression and re-aging treatment to balance strength and corrosion resistance of 7A99 Al alloy

被引：7
作者：
Zhang, Tao [1 ]
Hou, Yu-zhu [2 ]
Que, Biao-hua [2 ]
Tian, Yu-xin [3 ]
Chen, Liang [2 ]
机构：
[1] Nanjing Vocat Univ Ind Technol, Sch Mech Engn, Nanjing 210023, Peoples R China
[2] Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China
[3] Shandong Technol & Business Univ, Sch Comp Sci & Technol, Yantai 264005, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2023年 / 33卷 / 10期
关键词：
aging; pre-rolling; precipitates; mechanical properties; corrosion resistance; ZN-MG ALLOY; ALUMINUM-ALLOYS; CRACKING BEHAVIOR; MICROSTRUCTURE; CU; PRECIPITATION; PREDEFORMATION; MODEL;
D O I：
10.1016/S1003-6326(23)66307-1
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The 7A99 Al alloy was subjected to peak aging (PA) and retrogression + re-aging (RRA), and the pre-rolling (R) was combined with RRA (RRRA) to balance the mechanical properties and corrosion resistance. The results show that the precipitates of PA-treated sample are mainly unstable eta' phase with small size, while the coarse and stable eta phase appears after RRA and RRRA. The grain boundary precipitates of PA-treated sample exhibit the smallest size and continuous distribution, while they show increased size, discontinuous distribution, and Cu enrichment after RRA and RRRA. The hardness and strength of RRRA-treated sample are higher than those of RRA-treated one, and they are even close to the values of PA-treated one. Moreover, the samples exhibit better corrosion resistance after RRA and RRRA than that after PA. These results indicate that the proposed RRRA method can enhance the corrosion resistance without a significant sacrifice on the mechanical strength.
引用
收藏
页码：2913 / 2925
页数：13
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