摘要
在Mg-6Al-1Zn合金的基础上添加不同质量分数的Y(分别为0%,0.5%,0.9%,1.4%),制备了4种实验合金,研究了Y的添加对合金组织性能的影响。通过X射线衍射、金相显微镜、扫描电镜、电子探针等手段分析了Mg-6Al-1Zn合金添加Y后组织结构的变化。研究结果表明,添加了不同含量Y的合金中都出现了一种新相Al2Y相。随着Y含量的增加,Al2Y相数量增多而Mg17Al12相则减少。Y能细化合金铸态及挤压态显微组织,其细化作用在添加了0.9%Y的镁合金中尤为明显。铸态合金室温拉伸试验表明:该合金具有最佳的综合力学性能。当Y含量添加至1.4%时,Al2Y相变得粗大且出现团聚现象而导致了拉伸性能的下降。经过挤压后,合金的力学性能大幅度上升。
Effects of Y on microstructures and mechanical properties of Mg-6Al-1Zn alloys containing varied contents of Y （0%, 0.5%, 0.9%, 1.4%Y respectively） were studied. X-ray diffraction, optical microscopy, scanning electron microscopy and energy dispersive spectrum were used to analyze microstructures of the alloys. The experimental results show that alloys with variable Y contents contain a RE bearing phase Al2Y. The amount of Al2Y increases with Y while that of Mg17Al12 decreases. Moreover, Y refines the microstructures of as-cast and extruded alloys. The finest average grain size is obtained in 3^# ahoy with 0. 9% Y with the best mechanical properties. When Y content is up to 1.4%, Al2Y phase in 4^# alloy starts coarsening, leading to the drop of tensile strength. Properties of the studied alloys are improved significantly after extrusion.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2006年第6期724-728,共5页
Chinese Journal of Rare Metals
基金
湖南省科技攻关项目(04GK1008-2)
教育部有色金属重点实验室资助
