Microstructure evolution and mechanical properties of the Al-Cu-Mg-Ag alloy during non-isothermal aging

被引：25
作者：
Wang, Jian [1 ,2 ]
Xie, Jingpei [1 ,2 ]
Mao, Zhiping [1 ,2 ]
Liang, Tingting [1 ,2 ]
Wang, Aiqin [1 ,2 ]
Wang, Wenyan [1 ,2 ]
Hao, Shiming [3 ]
机构：
[1] Henan Univ Sci & Technol, Sch Mat Sci & Engn, Luoyang 471023, Peoples R China
[2] Henan Univ Sci & Technol, Prov & Minist Coconstruct Collaborat Innovat Ctr N, Luoyang 471023, Peoples R China
[3] Henan Univ Sci & Technol, Sch Phys & Engn, Luoyang 471023, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2023年 / 942卷
关键词：
Al-Cu-Mg-Ag alloy; Non-isothermal aging; Precipitation behavior; phase; Heating rate; PRECIPITATION KINETICS; BEHAVIOR; PHASE; RESISTANCE; STRENGTH; THETA'; GROWTH; ZONES;
D O I：
10.1016/j.jallcom.2023.169031
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, the effect of non-isothermal aging treatment with the heating rate of 20, 40 and 60 degrees C/h on the precipitation behavior and mechanical properties of the Al-Cu-Mg-Ag alloy were investigated by differential scanning calorimetry (DSC) analysis, transmission electron microscopy (TEM) and high-angle annular dark field - scanning transmission electron microscopy (HAADF-STEM) observation, as well as hardness and tensile tests. The activation energy and Avrami exponent associated with the precipitation of omega phase were calculated based on the non-isothermal DSC experiments with various heating rates. The size distribution and number density of omega plates in the alpha-Al matrix under peak-aged condition were quantitatively counted. Besides, A non-isothermal aging kinetics model proposed was applied to evaluate the heating aging treatment (HAT) process of the Al-Cu-Mg-Ag alloy. Results indicate that HAT modifies the size and density of omega phase, thereby enhancing the mechanical properties of the Al-Cu-Mg-Ag alloy. HAT promotes the precipitation of omega phase and shortens the aging time for the alloy to reach the peak-aged condition. It is interesting that the size distribution of omega plates shifts to larger values with the increase of the heating rate during the HAT process. (c) 2023 Elsevier B.V. All rights reserved.
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页数：12
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