挤压态单/双相镁锂合金的组织与性能
Microstructure and Properties of Extruded Single and Dual Phase Magnesium-Lithium Alloy
张义俊 1门凯 1郭箫玥 1卢志安2
作者信息
- 1. 河南农业职业学院,郑州 451450
- 2. 郑州大学材料科学与工程学院,郑州 450001
- 折叠
摘要
对Mg-8.6Li-6.5Zn-1.4Y、Mg-9.6Li-8.9Zn-1.9Y铸态镁锂合金在相同工艺下进行热挤压变形,研究了两种镁锂合金的显微组织、密度和力学性能.结果表明:Mg-8.6Li-6.5Zn-1.4Y铸态合金主要由α-Mg相、β-Li相、Mg3Zn6Y1相组成,为(α+β)双相镁锂合金,Mg-9.6Li-8.9Zn-1.9Y铸态合金主要由β-Li相、Mg3Zn6Y1相组成,为β单相镁锂合金;热挤压变形后,双相镁锂合金中α-Mg相沿挤压方向变形呈条状,单相镁锂合金中形成少量尺寸较小的α-Mg相,两种合金中的Mg3Zn6Y1相均发生破碎并沿挤压方向变形;相比双相镁锂合金,单相镁锂合金的平均晶粒尺寸较小,第二相(Mg3Zn6Y1、Mg3Zn3Y2、LiMgZn相)平均尺寸和体积分数较大,且硬度、屈服强度、抗拉强度更大,分别增加了 2.72％,7.53％,3.59％,断后伸长率略有减小.
Abstract
Mg-8.6Li-6.5Zn-1.4Y and Mg-9.6Li-8.9Zn-1.9Y as-cast magnesium-lithium alloys were deformed under the same hot extrusion process.The microstructures,density and mechanical properties of the two magnesium-lithium alloys were studied.The results show that Mg-8.6Li-6.5Zn-1.4Y as-cast alloy was mainly composed of α-Mg phase,β-Li phase and Mg3Zn6Y1 phase,which was(α+β)dual phase magnesium-lithium alloy.Mg-9.6Li-8.9Zn-1.9Y as-cast alloy was mainly composed of β-Li phase and Mg3Zn6 Y1phase,which was β single phase magnesium-lithium alloy.After hot extrusion deformation,α-Mg phase of the dual phase magnesium-lithium alloy deformed in strip shape along the extrusion direction,and in the single phase magnesium-lithium alloy a few of α-Mg phase in small size were formed;Mg3Zn6 Y1 phase in the two alloys broke and was deformed along the extrusion direction.Compared with those of the dual phase alloy,the average grain size of the single phase magnesium-lithium alloy was smaller,and the average size and volume fraction of the second phase(Mg3Zn6Y1,Mg3Zn3Y2,LiMgZn phases)were larger,and the hardness,yield strength and tensile strength were higher,which increased by 2.72％,7.53％and 3.59％,respectively,and the elongation percentage after fracture decreased slightly.
关键词
稀土元素钇/镁锂合金/挤压变形/显微组织/力学性能Key words
rare earth Y/magnesium-lithium alloy/extrusion deformation/microstructure/mechanical property引用本文复制引用
基金项目
河南省科技攻关项目(192102310244)
机械工程智能化科研创新团队项目(HNACKT-2020-04)
出版年
2024
NETL
NSTL
万方数据