Mg-Al-Zn-Sm耐热镁合金的组织与力学性能  

Microstructure and Mechanical Properties of Mg-Al-Zn-Sm Heat-resistant Mg Alloy

作　　者：黄正华[1,2] 刘杰[1] 戚文军[1] 郑开宏[1] 张新明[2] 刘敏[1] 余志明[2] 

机构地区：[1]广州有色金属研究院,广东广州510650 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《热加工工艺》2012年第12期10-12,15,共4页Hot Working Technology

基　　金：粤港关键领域重点突破项目(2010A090604001);广东省产学研重大项目(2010A090200078);广东省重大科技专项(2011A080403008)

摘　　要：利用光学显微镜、扫描电镜和X射线衍射仪分析了铸态和固溶态AZ61和AZ61-2Sm合金组织形貌和相组成,测试了其硬度和拉伸力学性能。结果表明,向AZ61合金中添加2%Sm后,铸态组织有所细化,β-Mg17Al12相数量减少和尺寸变小,同时生成小块状的高热稳定性相Al2Sm。经固溶处理后,β-Mg17Al12相完全固溶于α-Mg基体中,只存在Al2Sm相。铸态和固溶态室温拉伸力学性能与AZ61合金相当,而铸态高温拉伸力学性能却显著提高,经固溶后得到进一步提高,与铸态室温相当。The microstructure and phase composition of as-cast and soluted AZ61 and AZ61-2Sm alloys were analyzed by optical microscope, scanning electron microscope and X-ray diffi＇action. Meanwhile, the hardness and tensile mechanical properties were tested. The results show that as-cast microstructure is refined slightly when 2%Sm is added into AZ61 alloy. 13-Mg17TAl12 phase decreases and becomes small; meanwhile small block A12Sm phase with high thermal stability is formed. After solution treatment, 13-Mg17Al12 phase dissolves into ct-Mg matrix completely, while Al2Sm phase still exists in the microstructure. As-cast and soluted tensile mechanical properties at ambient temperature are not enhanced effectively, while as-cast tensile mechanical property at elevated temperature is enhanced obviously and subsequently increased after solution treatment, which is equal with as-cast value at ambient temperature.

关 键 词：耐热镁合金 Sm变质 组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]