Achieving the synergistic of strength and ductility in Mg-15Gd-1Zn-0.4Zr alloy with hierarchical structure

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2024-07-01 DOI:10.1016/j.jma.2023.01.002

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引用次数: 0

Abstract

Currently, the hierarchical structure is one of the most effective means to enhance the strength and plasticity of metal materials, since the strain localization can be effectively delayed by the coordination of the unique microstructure. In this study, a hierarchical structure of Mg-15Gd-1Zn-0.4Zr (GZ151K) alloys containing grain, twin, and precipitation structural units was prepared by ultrasonic surface rolling process (USRP) and recrystallization annealing (RU). The results showed that the stress gradient generated by USRP formed a twin gradient structure, which will activate the twin-assisted precipitation (TAP) effect and twin-induced recrystallization (TIR) effect during RU. Then, the twin gradient structure transformed into a twin-precipitation gradient structure, and finally into a hierarchical structure with grain-twin-precipitation as the increasement of recrystallization degree. Besides, the dual gradient structure with twin and precipitation structural units had the highest strength and microhardness owing to the precipitation strengthening. However, the hierarchical structure with grain, twin, and precipitation structural units exhibited the most excellent combination of strength and plasticity under grain refinement and precipitation strengthening.

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实现了Mg-15Gd-1Zn-0.4Zr分层结构合金强度与塑性的协同

目前，分层结构是提高金属材料强度和塑性的最有效手段之一，因为通过独特微观结构的协调可以有效延缓应变定位。本研究采用超声波表面轧制工艺（USRP）和再结晶退火工艺（RU）制备了包含晶粒、孪晶和沉淀结构单元的分层结构 Mg-15Gd-1Zn-0.4Zr (GZ151K)合金。结果表明，USRP 产生的应力梯度形成了孪晶梯度结构，这将激活 RU 过程中的孪晶辅助沉淀（TAP）效应和孪晶诱导再结晶（TIR）效应。然后，孪生梯度结构转变为孪生沉淀梯度结构，并随着再结晶程度的增加最终转变为晶粒-孪生-沉淀的分层结构。此外，由于沉淀强化作用，孪晶和沉淀结构单元的双梯度结构具有最高的强度和显微硬度。然而，具有晶粒、孪晶和沉淀结构单元的分层结构在晶粒细化和沉淀强化的作用下表现出最出色的强度和塑性组合。

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

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.