Mechanical properties, microstructure and surface quality of Al-1.2Mg-0.6Si-0.2Cu alloy after solution heat treatment

• Published in: Rare metals 2017-07, Vol.36 (7), p.550-555
• Main Authors: Yan, Li-Zhen, Zhang, Yong-An, Xiong, Bai-Qing, Li, Xi-Wu, Li, Zhi-Hui, Liu, Hong-Wei, Huang, Shu-Hui, Zhao, Gang
• Format: Article
• Language: English
• Subjects: Biomaterials; Chemistry and Materials Science; Crystal defects; Ductility tests; Electron diffraction; Energy; Erichsen test; Grain growth; Grain size; Intermetallic compounds; Materials Engineering; Materials Science; Mechanical properties; Metallic Materials; Microstructure; Nanoscale Science and Technology; Physical Chemistry; Quality; Scanning electron microscopy; Solution heat treatment; Surface defects; Yield strength; 力学性能; 合金; 固溶热处理; 扫描电子显微镜; 显微组织; 电子背散射衍射; 表面质量; 金属间化合物
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-015-0623-1

The effect of solution heat treatment （SHT） on mechanical properties, microstructure and surface quality of Al-1.2Mg-0.6Si-0.2Cu-0.6Zn alloy was investigated by tensile test, Erichsen test, surface topography, scanning electron microscope （SEM） and electron back-scattered diffraction （EBSD）. The results indicate that with the increase in SHT temperature, yield strength and cupping test value （IE） of the sheets increase greatly and reach a peak value, then decrease. Meanwhile, intermetallic com- pounds dissolve into matrix gradually. The grains grow up as SHT temperature increases, and abnormal grain growth leads to the surface defects after solution-treated above 560 ~C. Considering mechanical properties, IE value, residual phases, grain size and surface quality of the sheets, SHT temperature for the alloy should not be higher than 550 ℃.