王力鹏,边丽萍,赵元亮,曾航航,梁伟,赵兴国.Li对快速凝固Mg96.5Gd2.5Zn1合金微观组织和力学性能的影响[J].稀有金属材料与工程,2018,47(10):3223~3227.[Wang Li-peng,Bian Li-ping,Zhao Yuan-liang,Zeng Hang-hang,Liang Wei,Zhao Xongguo.Effects of Li on the Microstructure and Mechanical Properties of Rapid Solidification of Mg96.5Gd2.5Zn1 Alloy[J].Rare Metal Materials and Engineering,2018,47(10):3223~3227.]
Li对快速凝固Mg96.5Gd2.5Zn1合金微观组织和力学性能的影响
投稿时间:2017-01-09  修订日期:2018-08-28
中文关键词:  Mg-Gd-Zn合金  长周期堆垛有序结构  显微组织  力学性能
基金项目:国家自然科学基金资助(51401143);山西省青年科技研究资助(2014021017-1);山西省回国留学人员科研资助项目(2014-029);
中文摘要:
      本文考察了快速凝固条件下不同含量Li元素添加对长周期有序结构相增强Mg-Gd-Zn合金微观组织和力学性能的影响。结果表明,随着Li元素的添加,铸态合金中Gd、Zn溶质原子在镁基体晶粒中的过饱和度降低、(Mg,Zn)3Gd晶界析出相增加、镁基体晶粒尺寸减小。而固溶处理后,随着Li含量的增加,合金中14H型长周期堆垛有序结构相(LPSO)的形成受到抑制,同时纳米/亚微米(Mg,Zn)3Gd颗粒相大量析出,当Li为7.6at. %时合金中无LPSO形成。经热挤压变形后,合金中块状14H相发生扭着分层开裂、层片状14H相发生不同程度溶解、(Mg,Zn)3Gd相破碎细化、基体发生不同程度再结晶;不加Li的Mg96.5Gd2.5Zn1表现出最佳的力学性能(UTS=325,δ=9.5%),而含Li合金则随Li含量的增加,力学性能逐步下降。合金在不同条件下的组织转变机理及力学行为变化被进行了分析。
Effects of Li on the Microstructure and Mechanical Properties of Rapid Solidification of Mg96.5Gd2.5Zn1 Alloy
英文关键词:Mg-Gd-Zn alloy  Long-period stacking ordered  Microstructure  Mechanical Properties
英文摘要:
      The effects of different amounts of Li addition on the microstructure and mechanical properties of Mg96.5Gd2.5Zn1 alloy by rapid solidification are investigated. The results indicate that the supersaturation of Gd and Zn solute atoms in the Mg matrix grain in the as-cast alloys decreased, (Mg, Zn) 3Gd precipitates located at the grain boundaries increased and the grain size of Mg matrix was reduced with Li addition. After solid-solution treatment, the formation of 14H type of long-period stacking phase in the alloys was inhibited and the nano- or submicron (Mg, Zn) 3Gd phase precipitated in large amounts with the increase of Li addition. And the Li content is 7.6 at. %, there is no LPSO formation in the alloy. After hot extrusion deformation, the block 14H phase in the alloys was kinked and delaminated, and lamellar 14H was dissolved in the matrix to some extent and (Mg,Zn)3Gd phase was fragmented and refined, the recrystallization occurred in the matrix in different extents. Mg96.5Gd2.5Zn1 alloy exhibits the best comprehensive mechanical property with the UTS of 325MPa and the EL of 9.5 %, whereas the mechanical properties of the alloys without Li addition decline gradually with the increase of Li addition. The microstructural evolution mechanism and mechanical behavior response under various conditions are analyzed.
作者单位E-mail
王力鹏 太原理工大学材料科学与工程学院 121355384@qq.com 
边丽萍 太原理工大学材料科学与工程学院 bianliping_724@126.com 
赵元亮 太原理工大学材料科学与工程学院  
曾航航 太原理工大学材料科学与工程学院  
梁伟 太原理工大学材料科学与工程学院  
赵兴国 太原理工大学材料科学与工程学院  
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