摘要
研究了微量Ti对Mg-2％Nd(N2)二元合金组织和性能的影响．结果表明,在不影响N2铸造性能的情况下,微量 Ti的加入大大细化了N2铸态合金的组织,提高了铸态合金N2在室温和高温的强度和塑性．微量Ti的加入也使N2合金在中温条件下的抗蠕变性能略有提高．使用二维点阵错配度模型研究了Ti对Mg-Nd二元合金的细化机理,结果表明α-Ti可以成为α-Mg凝固过程中的形核核心．
The effects of micro content Ti （mass fraction） on microstructure and properties of the as cast Mg-2%Nd binary alloy were investigated. The results showed that Ti additions refine the the microstructures of N2 alloy remarkably without any influence on the castbility, which leads to increase of the strength and plasticity of N2 alloy at both ambient temperature and high temperature. Ti microalloying also results in a little improvement of creep resistance at moderate temperature. The refining mechanism of Mg-Nd binary alloy was studied with the two-dimension lattice misfit model, and the result showed that α-Ti can be the heterogeneous nucleating center for Mg crystal grain.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2006年第3期309-313,共5页
Chinese Journal of Materials Research
基金
国家八六三计划新材料领域2001AA331030-01江苏省自然科学基金BK2004208资助项目.
关键词
金属材料
密排六方结构
低指面
点阵错配度
异质形核
metallic materials, closed hexagonal structure, low index plane, lattice misfit rate, heterogeneous nucleation
