Tailoring good combinations between strength and ductility in novel Mg−5Sn−2Al−1Zn alloy via different hot extrusion processes

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI:10.1016/S1003-6326(24)66529-5

Feng-jian SHI, Nan-ying PIAO, Ji-heng WANG, Hao-tian TAN, Yu-hang GUO, Fei YANG, Shu-jin CHEN, Sheng LU, Ze-xin WANG

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引用次数: 0

Abstract

A novel Mg−5Sn−2Al−1Zn (TAZ521) alloy was prepared. Direct extrusion (DE) and extrusion−shearing (ES) processes were performed on the alloy to improve its strength and ductility. The microstructure evolution, texture evolution, and strengthening mechanisms of as-homogenized and as-extruded alloy were investigated by XRD, SEM, TEM, EBSD, and tensile tests. The results showed that the mechanical properties of the DE-processed alloy were improved. However, the alloy exhibited a bimodal microstructure consisting of coarse grains and fine DRXed grains. After the ES process, the microstructure became more uniform and a good combination of strength and ductility was achieved. The TYS, UTS, and EL were 212 MPa, 303 MPa, and 21.7%, respectively. Grain refinement and pinning effect by Mg₂Sn precipitates play an important role in the enhancement of strength. Additionally, the improvement of ductility is attributed to the weak basal fiber texture and the activation of non-basal slip.

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通过不同的热挤压工艺在新型 Mg-5Sn-2Al-1Zn 合金中实现强度和延展性的良好结合

制备了一种新型 Mg-5Sn-2Al-1Zn (TAZ521) 合金。对该合金进行了直接挤压（DE）和挤压剪切（ES）处理，以提高其强度和延展性。通过 XRD、SEM、TEM、EBSD 和拉伸试验研究了均质化合金和挤压合金的微观结构演变、纹理演变和强化机制。结果表明，去挤压加工合金的机械性能得到了改善。但是，合金呈现出由粗晶粒和细小 DRX 化晶粒组成的双峰微观结构。经过 ES 处理后，微观结构变得更加均匀，并实现了强度和延展性的良好结合。其 TYS、UTS 和 EL 分别为 212 MPa、303 MPa 和 21.7%。Mg2Sn 沉淀的晶粒细化和针化效应在提高强度方面发挥了重要作用。此外，延展性的改善还归因于弱基底纤维纹理和非基底滑移的激活。

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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.