Microstructure, mechanical properties, and corrosion resistance of Mg–9Li–3Al–1.6Y alloy

• Published in: Rare metals Vol. 35; no. 5; pp. 374 - 379
• Main Authors: Yang, Hao-Miao, Zhang, Nan-Yi, Liu, Na, Xie, Wei-Dong, Peng, Xiao-Dong
• Format: Journal Article
• Language: English
• Published: Beijing Nonferrous Metals Society of China 01.05.2016; Springer Nature B.V
• Subjects: Al合金; Biomaterials; Chemistry and Materials Science; Corrosion resistance; Electronics; Energy; Extrusion; Grain size; Homogenizing; Magnesium base alloys; Materials Engineering; Materials Science; Mechanical properties; Metallic Materials; Microstructure; Nanoscale Science and Technology; Physical Chemistry; 力学性能测试; 平均晶粒尺寸; 微观结构; 扫描电子显微镜; 机械性能; 耐腐蚀性能; 镁; Corrosion resistance; Mechanical properties; Microstructures; Magnesium alloy
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-014-0227-1

Mg–9Li–3Al–1.6Y alloys were prepared through mixture method. The microstructure, mechanical properties, and corrosion resistance of the as-cast and asextruded alloys were studied by optical microscopy（OM）,scanning electronic microscopy（SEM）, X-ray diffraction（XRD）, mechanical properties testing, and electrochemical measurement. The as-cast Mg–9Li–3Al–1.6Y alloy with the average grain size of 325 lm is composed of b-Li matrix, block a-Mg, and granule Al2Y phases. After extrusion, the grain size of the as-cast alloy is obviously refined and reaches to 75 lm; the strength and elongation of the extruded alloy are enhanced by 17.20 % and49.45 %, respectively, owing to their fine microstructure and reduction of casting defects. The as-extruded alloy shows better corrosion resistance compared to the as-cast one, which may be related to the low stored energy and dislocation density in the extruded alloy, also the homogenization treatment before extrusion.