Mg-6Al-2Sr-xY镁合金的显微组织和力学性能
Microstructure and Mechanical Properties of Mg-6Al-2Sr-xY Magnesium Alloys
摘 要
采用氩气保护的方法制备了Mg-6Al-2Sr-xY镁合金,研究了钇含量对该合金显微组织和力学性能的影响,探讨了锶和钇在合金中的存在形式.结果表明:加入适量的钇能使该合金的铸态显微组织明显细化,锶和钇在合金中主要以Al4Sr、Al2Y和Al3Y形态存在,Al4Sr相呈骨骼状分布于晶界处,Al2Y和Al3Y呈颗粒状主要在晶内析出;合金的力学性能随着钇含量的增加呈现先上升后下降的趋势,当钇质量分数为1.5%时,与Mg-6Al-2Sr镁合金相比,该合金的抗拉强度提高了20.6%,屈服强度提高了24.6%,伸长率提高了52.9%.
钇
显微组织
力学性能
Mg-6Al-2Sr alloy
yttrium
microstructure
mechanical property
Abstract
A series of Mg-6Al-2Sr-xY magnesium alloys were prepared under the protection of argon atmosphere.The effect of Y content on microstructure and mechanical properties of Mg-6Al-2Sr-xY was studied and the existing forms of Y and Sr in the alloy were discussed.The results indicate that the proper addition of Y resulted in the refinement of Mg-6Al-2Sr-xY alloy microstructure.Sr and Y exsited in the forms of Al4Sr,Al2Y and Al3Y phase.Net-like Al4Sr phase was distributed along the grain boundary and particle-like or acicular Al-Y phase was mainly precipitated from the grain.The mechanical properties of the alloys initially ascended and then descended with the increase of Y addition.When Y content was 1.5wt%,compared with Mg-6Al-2Sr alloy,the tensile strength of the alloy was improved by 20.6%,yield strength was increased by 24.6% and the elongation was enhanced by 52.9%.
中图分类号 TG146.2
所属栏目 材料性能及其应用
基金项目 国家“973”计划资助项目(2007CB613702);重庆市科技攻关计划项目(CSTC,2006AA4012)
收稿日期 2008/12/5
修改稿日期 2009/7/2
网络出版日期
作者单位点击查看
备注杨艳(1983-),女,山东临沂人,硕士研究生.
引用该论文: YANG Yan,PENG Xiao-dong,XIE Wei-dong,FENG Yan-bin,WEI Qun-yi,SU Zhong-hua. Microstructure and Mechanical Properties of Mg-6Al-2Sr-xY Magnesium Alloys[J]. Materials for mechancial engineering, 2010, 34(1): 61～64
杨艳,彭晓东,谢卫东,冯艳斌,魏群义,苏中华. Mg-6Al-2Sr-xY镁合金的显微组织和力学性能[J]. 机械工程材料, 2010, 34(1): 61～64
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