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Microstructure refinement and high-temperature tensile properties of Mg–12Gd–3Y–0.5Zr alloy after equal channel angular pressing
Philosophical Magazine Letters ( IF 1.2 ) Pub Date : 2021-10-06 , DOI: 10.1080/09500839.2021.1985733
N. Zhang 1 , H. J. Yang 2 , X. H. Shao 2
Affiliation  

ABSTRACT

Grain refinement is significant for the mechanical properties of engineering alloys. We achieved a bi-ultrafine microstructure in an Mg–12Gd–3Y–0.5Zr alloy through equal channel angular pressing (ECAP) at 300°C. The ECAP not only refined the matrix grains but also broke the large intermetallic particles into fine secondary particles and then rearranged them at the grain boundaries. These fine particles can suppress the growth of the recrystallised grains, as well as promote nucleation for recrystallisation. After four passes of ECAP, a uniform microstructure with both the matrix grain (∼500 nm) and the particle size (∼300 nm) in the ultrafine range was obtained. This unique microstructure resulted in a good combination of strength (>300MPa) and elongation to failure (>35%) at 200°C, which sheds new light on refining microstructure to obtain good mechanical performance at elevated temperatures for Mg alloys.



中文翻译:

Mg-12Gd-3Y-0.5Zr合金等通道角挤压后的组织细化及高温拉伸性能

摘要

晶粒细化对工程合金的力学性能具有重要意义。我们在 300°C 下通过等通道角压制 (ECAP) 在 Mg-12Gd-3Y-0.5Zr 合金中实现了双超细微观结构。ECAP不仅细化了基体晶粒,而且将大金属间化合物颗粒分解成细小的二次颗粒,然后在晶界处重新排列。这些细颗粒可以抑制再结晶晶粒的生长,并促进再结晶的形核。经过四遍 ECAP 后,获得了具有超细范围内的基体晶粒(~500 nm)和粒径(~300 nm)的均匀微观结构。这种独特的微观结构在 200°C 下实现了强度 (>300MPa) 和断裂伸长率 (>35%) 的良好组合,

更新日期:2021-10-06
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