Effects of Zn and Gd contents and their ratios on microstructure and mechanical properties of as-cast and as-extruded Mg−8Li alloys

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Transactions of Nonferrous Metals Society of China Pub Date : 2024-03-01 DOI:10.1016/S1003-6326(23)66435-0

Yu-chuan HUANG , Quan-da ZHANG , Si-jie OUYANG , Fu-zhen SUN , Jia-wei SUN , Hui-yu LI , Guo-hua WU , Pei-jun CHEN , Wen-cai LIU

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Abstract

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.

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锌和钆含量及其比例对铸造和挤压成型 Mg-8Li 合金微观结构和机械性能的影响

研究了 Zn 和 Gd 元素的含量及其质量比对铸造和挤压 Mg-8Li 合金的微观结构和机械性能的影响。挤压后，析出物破碎，尺寸约为 100 nm 的细球形颗粒分散在 β-Li 中。形成了由长条状粗晶粒α-镁和再结晶细晶粒β-锂组成的双模态结构。挤压后合金的强度和塑性大大提高，YS 和 UTS 随 Zn 和 Gd 含量的增加而增加。Mg-8Li-8Zn-2Gd 合金的综合性能最佳，YS 为 274 兆帕，UTS 为 283 兆帕，EL 为 39.9%。由 β-Li 的细晶强化和 α-Mg 的质地强化组成的双模结构强化以及析出物的分散强化是主要的强化机制。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.