(1. 沈陽(yáng)工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，沈陽(yáng) 110023;
2. 中國(guó)科學(xué)院 金屬研究所，沈陽(yáng) 110016)
摘 要: 研究了電磁場(chǎng)對(duì)AZ91D合金組織的影響，分析和測(cè)試了AZ91D合金擠壓變形后的組織及性能。結(jié)果表明：電磁攪拌使AZ91D合金枝晶組織發(fā)生球化和細(xì)化，β-Mg17Al12相數(shù)量增加，并使Zn元素在β-Mg17Al12相的偏聚傾向降低；擠壓成形后的合金極限抗拉強(qiáng)度高達(dá)285?MPa，比壓鑄合金提高30%，延伸率為12%，是壓鑄合金的2倍多。
關(guān)鍵字: 鎂合金；電磁攪拌；擠壓；微觀組織；力學(xué)性能
microstructures and mechanical
properties of AZ91D alloy
（1. School of Materials Science and Engineering，
Shenyang University of Technology，Shenyang 110023，China;
2. Institute of Metal Research， The Chinese Academy of Science，
Shenyang 110016，China）
Abstract:The effects of electromagnetic field on the microstructures of AZ91D alloy were studied，and the microstructure and properties characteristics of the alloy were analyzed. The results show that electromagnetic stirring has the action of spheroidization and refining intermetallic structure of α-Mg phase，and reduces the amount of Mg17Al12 phase and the segregation tendency of Zn element in Mg17Al12 phase. The ultimate tensile strength of the extruded AZ91D alloy is 285MPa，which is 30% higher than that of die casting alloy，and elongation is about 12%，two times more than that of diecasting alloy.
Key words: magnesium alloy; electromagnetic stirring; extrusion; microstructure; mechanical properties
