首页|Zn和Gd元素含量和比例对铸态和挤压态Mg-8Li合金显微组织和力学性能的影响

Zn和Gd元素含量和比例对铸态和挤压态Mg-8Li合金显微组织和力学性能的影响

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研究Zn和Gd元素含量及其质量比对铸态和挤压态Mg-8Li合金显微组织和力学性能的影响.挤压后,析出相破碎.β-Li中分散着粒径约100 nm的球形微粒.形成了由长条状α-Mg粗晶和再结晶β-Li细晶组成的双峰结构.挤压后合金的强度和塑性显著提高,且屈服强度和极限抗拉强度随Zn和Gd含量的增加而增加.Mg-8Li-8Zn-2Gd合金表现出最优的综合性能,其屈服强度、极限抗拉强度和伸长率分别为274 MPa、283 MPa和39.9％.挤压态合金主要强化机制为由β-Li的细晶强化和α-Mg的织构强化组成的双模态结构强化和析出相的弥散强化.
Effects of Zn and Gd contents and their ratios on microstructure and mechanical properties of as-cast and as-extruded Mg-8Li alloys
The effects of contents of Zn and Gd elements and their mass ratios on microstructure and mechanical properties of as-cast and as-extruded Mg-8Li alloys were investigated.After extrusion,the precipitates are broken,and fine spherical particles with size about 100 nm are found to disperse in the β-Li.The bi-modal structure consisting of long-strip-like coarse-grain α-Mg and recrystallized fine-grain β-Li is formed.The strength and plasticity of the alloys are greatly improved after extrusion,and the YS and UTS increase with the increase of Zn and Gd contents.The Mg-8Li-8Zn-2Gd alloy exhibits an optimum comprehensive performance with the YS of 274 MPa,UTS of 283 MPa,and EL of 39.9％.The bi-modal structure strengthening consisting of the fine crystal strengthening of β-Li and texture strengthening of α-Mg,and the dispersion strengthening of precipitations are the main strengthening mechanisms.

Mg-Li alloyextrusion deformationbi-modal structuredispersion strengthening

黄玉川、张泉达、欧阳思杰、孙福臻、孙家伟、李蕙宇、吴国华、陈培军、刘文才

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中国机械科学研究总院集团有限公司先进成形技术与装备国家重点实验室,北京 100083

北京机科国创轻量化科学研究院有限公司,北京 100083

上海交通大学材料科学与工程学院轻合金精密成型国家工程中心和金属基复合材料重点实验室,上海 200240

洛阳晟雅镁合金科技有限公司,洛阳 471921

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镁锂合金 挤压变形 双峰结构 弥散强化

Open Fund of State Key Laboratory of Advanced Forming Technology and EquipmentMajor Scientific and Technological Innovation Project of Luoyang,China国家自然科学基金国家自然科学基金Research Program of SAST-SJTU Joint Research Center of Advanced Spaceflight Technologies,China

SKL2020052201029A5177111551775334USCAST2020-14

2024

10.1016/S1003-6326(23)66435-0

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(3)
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