Deformation behavior at cryogenic temperature in extruded Mg–Al–Zn alloy

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

Philosophical Magazine Letters Pub Date : 2022-11-18 DOI:10.1080/09500839.2022.2143592

H. Somekawa, Yukiko Ogawa, Y. Ono, Ashutosh Kumar Singh

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引用次数: 1

Abstract

ABSTRACT The effect of grain size on tensile deformation behaviors at room- and cryogenic-temperatures was examined using extruded Mg–Al–Zn (AZ31) alloys with different average grain sizes of 3.7, 14.0, and 38.7 μm. The mechanical properties were influenced by the grain size as well as the testing temperature. Strength increased with a finer grained structure and a lower testing temperature. Regarding the elongation-to-failure in tension, all the alloys tested at cryogenic-temperature exhibited about half the values of those at room-temperature. Deformed microstructural observations revealed that deformation twins formed in the alloys with coarse- and meso-grained structures, but decreased with grain refinement. The reduction of twin formation at both room- and cryogenic-temperatures is due to enhancement of grain boundary plasticity. Contrary to our expectation, it is interesting to note that grain boundary compatibility contributes to activation of non-basal dislocation slips, irrespective of testing temperatures. In addition, dislocation slips lead to occurrence of strain hardening after yielding even at 77 K.

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挤压Mg–Al–Zn合金的低温变形行为

采用平均晶粒尺寸为3.7、14.0和38.7 μm的挤压Mg-Al-Zn (AZ31)合金，研究了晶粒尺寸对室温和低温拉伸变形行为的影响。晶粒尺寸和测试温度对材料的力学性能均有影响。晶粒越细，测试温度越低，强度越高。在低温条件下，所有合金的拉伸延伸失效率都只有室温条件下的一半左右。变形组织观察表明，在粗晶和中晶合金中形成变形孪晶，但随晶粒细化而减少。室温和低温下孪晶形成的减少是由于晶界塑性的增强。与我们的预期相反，有趣的是，无论测试温度如何，晶界相容性都有助于非基底位错滑移的激活。此外，位错滑移导致即使在77 K屈服后也发生应变硬化。

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.