Microstructure refinement and high-temperature tensile properties of Mg–12Gd–3Y–0.5Zr alloy after equal channel angular pressing

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters Pub Date : 2021-10-06 DOI:10.1080/09500839.2021.1985733

N. Zhang, Hang Yang, X. Shao

引用次数: 2

Abstract

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.

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Mg–12Gd–3Y–0.5Zr合金等通道角挤压后的组织细化和高温拉伸性能

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下通过等通道角挤压（ECAP）在Mg–12Gd–3Y–0.5Zr合金中获得了双超细组织。ECAP不仅细化了基体晶粒，而且将较大的金属间颗粒破碎成细小的二次颗粒，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，并促进再结晶的成核。经过四次ECAP后，获得了基体晶粒（～500nm）和粒度（～300nm）均在超细范围内的均匀微观结构。这种独特的微观结构使镁合金在200°C下具有良好的强度（>300MPa）和断裂伸长率（>35%），这为细化微观结构以在高温下获得良好的机械性能提供了新的线索。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.