Preparation of semi-solid billet of magnesium alloy and its thixoforming

• Published in: Transactions of Nonferrous Metals Society of China Vol. 17; no. 1; pp. 46 - 50
• Main Author: 姜巨福 罗守靖
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2007; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
• Subjects: equal channel angular extrusion(ECAE); magnesium alloy; mechanical properties; semi-solid billet; thixoforming; 微观结构; 机械性能; 触变性; 镁合金; equal channel angular extrusion(ECAE); magnesium alloy; thixoforming; mechanical properties; semi-solid billet
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(07)60046-6

Preparation of semi-solid billet of magnesium alloy and thixoforming was investigated by applying equal channel angular extrusion to magnesium alloy. The results show that mechanical properties of AZ91D alloy at room temperature, such as yield strength（YS）, ultimate tensile strength（UTS） and elongation, are enhanced greatly by four-pass equal channel angular extrusion（ECAE） at 573 K and microstructure of AZ91D alloy is refined to the average grain size of 20 μm. Through using ECAE as strain induced step in SIMA and completing melt activated step by semi-solid isothermal treatment, semi-solid billet with fine spheroidal grains of 25 μm can be prepared successfully. Compared with common SIMA, thixoformed satellite angle frame components using semi-solid billet prepared by new SIMA have higher mechanical properties at room temperature and high temperature of 373 K.