摘要
研究了不同Ag含量的Mg-Y-Zn-Ag稀土镁合金经过热处理后的组织和力学性能的变化。结果发现,在稀土镁合金中添加Ag后,经过热处理后,晶粒尺寸明显细化,合金中LPSO相（长周期堆垛有序结构）细化显著,同时Ag2Mg和MgAg相分布更加均匀。通过500℃×24 h固溶和200℃×20 h时效后,合金的力学性能提升显著。当合金中加入Ag含量为3%时（质量分数,下同）,合金性能最佳,抗拉强度和伸长率分别为194 MPa和7. 1%。Ag含量为2%时,500℃固溶处理24 h,合金达到了最高显微硬度为81. 2 HV0. 2,对比铸态原始合金显微硬度提升显著。
Microstructure and mechanical properties of Mg-Y-Zn-Ag rare earth magnesium alloy after different heat treatments were studied.The results show that with addition of Ag,the grain size and LPSO phase （long-period stacking order structure） of the Mg-Y-Zn-Ag rare earth magnesium alloy are significantly refined,and the distribution of Ag2Mg and MgAg phases in the alloy is more uniform. After 500 ℃ ×24 h solution treatment and 200 ℃ × 20 h aging,the mechanical properties of the alloy are improved significantly. When the content of Ag is 3% （mass fraction,the same below）,the alloy has the best properties,the tensile strength and elongation are 194 MPa and 7. 1%,respectively. When the content of Ag is 2%,and treated at 500 ℃ for 24 h,the maximum microhardness of the alloy is 81. 2 HV0. 2,which is significantly improved compared with that of the as-cast alloy.
作者
杜金星
华建社
赵旭
袁超
Du Jinxing;Hua Jianshe;Zhao Xu;Yuan Chao(School of Metallurgical Engineering,Xi＇an University of Architecture and Technology,Xi＇an Shaanxi 710055,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2018年第11期173-177,共5页
Heat Treatment of Metals
关键词
稀土镁合金
AG
Y
微观组织
力学性能
热处理
rare earth magnesium alloy
Ag
Y
microstructure
mechanical properties
heat treatment
