通过挤压和时效处理的 Mg-13Gd-0.2Ni 合金的微观结构和力学性能

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Hang Zhang, Jiaying Zhao, Rongguang Li, Boshu Liu, Shanshan Li, Sha Sha, Yuehong Zhang, Man Xu, Yan Tang
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引用次数: 0

摘要

在这项研究中,通过常规挤压和时效处理,Mg-13Gd-0.2Ni 合金实现了强度和延展性的良好结合。时效处理后的 Mg-13Gd-0.2Ni 合金的屈服强度 (YS) 为 363 兆帕,极限拉伸强度 (UTS) 为 433 兆帕,伸长率为 11.9%。老化后的 Mg-13Gd-0.2Ni 合金的微观结构中,动态再结晶(DRXed)晶粒的比例高达 95%,晶粒尺寸为微米级,质地较弱,晶粒内棱柱形 β′ 沉淀的数量密度较高。富含镍元素的块状化合物主要在铸造过程中形成,并在挤压和老化样品中保持稳定。挤压过程中形成的动态化合物很少,而在老化过程中形成了高密度的棱柱形β′沉淀。高密度的棱柱形 β′ 沉淀使 Mg-13Gd-0.2Ni 合金的强度显著提高,YS 和 UTS 分别提高了 153 和 136 兆帕。具有弱质地的高比例 DRX 化晶粒是高延展性的主要原因,而时效过程中在晶界形成的低密度细小化合物对时效 Mg-13Gd-0.2Ni 合金的延展性没有明显的不利影响。这些对新型 Mg-Gd-Ni 合金的研究结果可为设计具有优异机械性能的锻造镁合金提供指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microstructure and Mechanical Property of Mg-13Gd-0.2Ni Alloy Processed by Extrusion and Aging

In this work, a good combination of strength and ductility is achieved in a Mg-13Gd-0.2Ni alloy by conventional extrusion and following aging treatment. The aged Mg-13Gd-0.2Ni alloy exhibits a yield strength (YS) of 363 MPa, an ultimate tensile strength (UTS) of 433 MPa, and an elongation of 11.9%. The aged Mg-13Gd-0.2Ni alloy contains a microstructure with a 95% proportion of dynamically recrystallized (DRXed) grains with a micron size, weak texture, and a high number density of prismatic β′ precipitates within grains. The bulk compounds enriched with Ni element which are mainly formed during casting and stable in the extruded and aged samples. Few dynamic compounds are formed during extrusion, and a high density of prismatic β′ precipitates are formed during aging. The high density of prismatic β′ precipitates results in a significant increase in the strength of the Mg-13Gd-0.2Ni alloy, and the YS and UTS are increased by 153 and 136 MPa, respectively. The high proportion of DRXed grains with a weak texture contributes mainly to the high ductility and the fine compounds with a low density at grain boundaries formed during aging have no significant adverse effect on ductility of the aged Mg-13Gd-0.2Ni alloy. These findings for the novel Mg-Gd-Ni alloy can provide guidance for the design of wrought Mg alloys with superior mechanical properties.

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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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