Microstructure and Mechanical Properties of Spray-Formed 7075 Alloy During Retrogression

被引：6
作者：
Li, Rongde [1 ]
Liu, Tong [1 ]
Su, Ruiming [1 ]
Qu, Yingdong [1 ]
机构：
[1] Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang Econ & Technol Dev Area, Shenliaoxilu 111, Shenyang 110870, Liaoning, Peoples R China
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2018年 / 27卷 / 09期
基金：
中国国家自然科学基金;
关键词：
7075; alloy; conductivity; microstructure; retrogression and reaging; spray forming; strength; XRD; STRESS-CORROSION CRACKING; ALUMINUM-ALLOY; DEGREES-C; BEHAVIOR;
D O I：
10.1007/s11665-018-3606-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The mechanical properties, conductivity, microstructure, precipitation behavior and evolution process of elements and phases of spray-formed 7075 alloy during retrogression are studied by the tensile test, electric test, hardness test, transmission electron microscope (TEM), x-ray diffraction (XRD) analysis, electron-dispersive spectroscopy (EDS) and lattice parameter measurements. The results show that the mechanical properties and conductivity of the alloy can be effectively improved when treated at a suitable retrogression temperature and time. According to the TEM observations, XRD analysis, EDS and an accurate measurement of the lattice parameter, the redissolution of elements and precipitated phases can be readily observed. From the optimization selection of the RRA treatment for the 7075 alloy, the regularity of redissolution and precipitation of the elements and phases are evaluated. The ultimate tensile strength, yield strength, hardness, elongation and conductivity of the spray-formed 7075 alloy after preaging at 120 degrees C for 16h, retrogression at 200 degrees C for 8min and reaging at 120 degrees C for 24h are 791, 736MPa, 181 HBW, 8.5% and 22.6MS/m, respectively.
引用
收藏
页码：4437 / 4443
页数：7
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