摘要
研究了Sr和Zr对长周期结构增强Mg97Y2Cu1合金凝固组织和力学性能的影响。结果表明,合金中0.1%的Sr或0.8%的Zr能够细化其凝固组织,提高力学性能,且Sr和Zr复合添加的作用效果更好。复合添加Sr和Zr时,合金的初生相变成细小的等轴晶或蔷薇状晶体,第二相分布最为均匀,且分布在晶界上的第二相体积含量有较大幅度提高;合金的抗拉强度和伸长率分别为222.5 MPa和10.7%,较未合金化处理的试样分别提高了29%和84%。
Influences of Sr and Zr on solidified structure and mechanical properties of Mg97Y2Cul alloy reinforced by long period ordered structure were investigated. The results show that with 0. 1% Sr or 0.8% Zr addition, solidified structure can be refined, and mechanical properties of the alloy can be improved, especially combined addition of Sr and Zr. With the combined addition of Sr and Zr, primary phase in the alloy is transformed into fine equiaxed grains or rosette ones with the uniform distribution of the second phase, meanwhile, its volume fraction along grain boundary is increased greatly. The tensile strength and elongation of the alloy reach 222.5 MPa and 10.7%, which are increased by up to 29% and 84%, respectively, compared with the alloy without treatment.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2015年第9期981-984,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金项目(51261026)
关键词
长周期增强结构
SR
ZR
凝固组织
力学性能
Long Period Ordered Structure, St, Zr, Solidified Structure, Mechanical Properties
