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新型Mg-4Li-xCa合金显微组织及力学性能
Microstructure and Properties of Novel Mg-4Li-xCa Alloy
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- DOI:
- 作者:
- 张开望 1 ，张 强 1 ，石新泰 1 ，柴东朗 2 ，闫劲儒 1
ZHANG Kaiwang1 , ZHANG Qiang1 , SHI Xintai1 , CHAI Donglang2 , YAN Jinru1
- 作者单位:
- 1. 中国航天科技集团公司 第九研究院 第十六研究所，陕西 西安 710100; 2. 西安交通大学，陕西 西安 710049
1. N0.16 Institute of No.9 Academe of China Aerospace Technology Corporation, Xi’an 710100, China; 2. Xi’an Jiaotong University, Xi’an 710049, China
- 关键词:
- 显微组织；凝固过程；Mg2Ca；力学性能
microstructure; solidification process; Mg2Ca; mechanical properties
- 摘要:
- 设计并制备了新型 Mg-4Li-xCa(x=0.3%~1.5%)合金，采用 SEM 和 XRD 研究了不同 Ca 含量的合金组织形
貌，并分析了合金的凝固过程。探讨了 B、Y 元素的添加对合金显微组织及力学性能的影响。结果表明，对于 Mg-4Li-xCa
合金，当 Ca 含量≤1%时，组织为单相 α-Mg，Ca 含量为 1.5%时，共晶组织(α+Mg2Ca)生成。Y 对合金细晶强化效果显著，
可同时提高合金的强度和伸长率；添加 0.5%B 的合金抗拉强度可达到 250 MPa，伸长率为 6.7%。
A new type of Mg-4Li-xCa (x=0.3~1.5%) alloy was designed and prepared. The microstructure of the alloy with different Ca contents was studied by SEM and XRD, and the solidification process of the alloy was analyzed. The effects of the addition of B and Y elements on the microstructure and mechanical properties of the alloy were discussed. The results show that, for Mg-4Li-xCa (x =0.3~1.5% ) alloy, when containing Ca content of 1% or less, the microstructure is for single-phase α-Mg, when Ca content is 1.5%, the eutectic microstructure is (α+Mg2Ca). The effect of Y on the fine grain strengthening of the alloy is significant, and the strength and elongation of the alloy can be improved simultaneously. The tensile strength and elongation of the alloy with 0.5%B can reach 250 MPa and 6.7%, respectively