Effect of Room Temperature Ultrasonic Vibration Compression on the Microstructure Evolution and Mechanical Properties of AZ91 Alloy

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Acta Metallurgica Sinica-English Letters Pub Date : 2024-04-09 DOI:10.1007/s40195-024-01692-2
Ziyue Xu, Huan Liu, Luyao Li, Chao Sun, Xi Tan, Baishan Chen, Qiangsheng Dong, Yuna Wu, Jinghua Jiang, Jiang Ma
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Abstract

To investigate the potential of direct ultrasonic vibration on improving the performance of magnesium alloys, this study first employed the ultrasonic vibration compression (UVC) on the solid solution treated AZ91 alloy, and explored its microstructure evolution and mechanical properties under UVC. Within only two seconds, the UVC alloys showed large deformation strains of 34.8–54.4%, and sudden increase of sample temperature to 243 °C. Microstructure characterizations proved that UVC promoted the formation of abundant shear bands, fine grains, and the bimodal distribution of Mg17Al12 precipitates consisting of submicron particles located within the shear bands and nano-sized ones within the matrix. Owing to the unique microstructure, the micro-hardness (and nano-hardness) value of UVC alloy was increased by 37.7% (35%) when compared with the solution-treated alloy. Moreover, the nano-modulus of the developed AZ91 alloy was also significantly increased to 62 GPa by statistical nanoindentation tests, which could be ascribed to increased Mg17Al12 precipitates and decreased c/a value to some extent. In general, this work provides a new insight into the design and preparation of high-performance magnesium alloys by UVC at room temperature.

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室温超声振动压缩对 AZ91 合金微观结构演变和力学性能的影响
为了研究直接超声振动在改善镁合金性能方面的潜力,本研究首先在固溶处理的 AZ91 合金上采用了超声振动压缩(UVC),并探讨了其在 UVC 下的微观结构演变和力学性能。在短短两秒钟内,UVC 合金出现了 34.8-54.4% 的大变形应变,样品温度骤升至 243 ℃。微观结构表征证明,紫外线促进了大量剪切带、细晶粒的形成,以及 Mg17Al12 沉淀的双峰分布,其中剪切带中有亚微米级颗粒,基体中则有纳米级颗粒。由于独特的微观结构,UVC 合金的显微硬度(和纳米硬度)值比溶液处理合金提高了 37.7%(35%)。此外,通过统计纳米压痕测试,所开发的 AZ91 合金的纳米模量也显著增加到 62 GPa,这在一定程度上可归因于 Mg17Al12 沉淀的增加和 c/a 值的降低。总之,这项工作为在室温下通过超低温设计和制备高性能镁合金提供了新的视角。
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来源期刊
Acta Metallurgica Sinica-English Letters
Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
6.60
自引率
14.30%
发文量
122
审稿时长
2 months
期刊介绍: This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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