(東南大學(xué) 材料科學(xué)與工程系，南京 210096)
摘 要: 研究了合金元素Sb對(duì)Mg-9Al-0.8Zn(AZ91 )基合金顯微組織和力學(xué)性能的影響。結(jié)果表明，Sb加入后改善了合金的鑄態(tài)組織，使粗大的樹(shù)枝晶變得更細(xì)小、彌散，Sb主要是以彌散的第二相Mg3Sb2的形式分布于基體中。由于該相致密，熔點(diǎn)高，熱穩(wěn)定性好，強(qiáng)化了晶界，使得合金室溫和高溫力學(xué)性能得到一定的改善，尤其使得抗高溫蠕變性能大幅度提高，塑性并沒(méi)有受到明顯損害。
關(guān)鍵字: 鎂合金；Sb；力學(xué)性能
（Department of Materials Science and Engineering, Southeast University, Nanjing 210096, P. R. China）
Abstract:The effect of antimony additions on the microstructure and the mechanical properties of Mg-9Al-0.8Zn(AZ91) based alloys was studied. The results indicate that the microstructure is modified and the tensile strength of AZ91 based alloy at both ambient and elevated temperature is increased, especially the creep rupture resistance at high temperature is significantly improved by adding small amount of antimony. Although the antimony addition results in decrease of ductility, the reduction is slight. Therefore, the antimony element is a new promising low price metal to expand magnesium alloys to high temperature applications.
Key words: magnesium alloy; Sb; mechanical property
