热处理对超高强度SiC/Al–Zn–Mg–Cu复合材料微观组织、力学性能和断裂行为的影响

马国楠; 朱士泽; 王东; 薛鹏; 肖伯律; 马宗义

doi:10.1007/s12613-024-2856-1

Volume 31 Issue 10

Oct. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(10): 2233-2243

Guonan Ma, Shize Zhu, Dong Wang, Peng Xue, Bolü Xiao, and Zongyi Ma, Effect of heat treatment on the microstructure, mechanical properties and fracture behaviors of ultra-high-strength SiC/Al–Zn–Mg–Cu composites, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2233-2243. https://doi.org/10.1007/s12613-024-2856-1

Cite this article as:

Guonan Ma, Shize Zhu, Dong Wang, Peng Xue, Bolü Xiao, and Zongyi Ma, Effect of heat treatment on the microstructure, mechanical properties and fracture behaviors of ultra-high-strength SiC/Al–Zn–Mg–Cu composites, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2233-2243. https://doi.org/10.1007/s12613-024-2856-1

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研究论文

热处理对超高强度SiC/Al–Zn–Mg–Cu复合材料微观组织、力学性能和断裂行为的影响

1)
中国科学院金属研究所师昌绪先进材料创新中心, 沈阳 110016, 中国
2)
东莞材料基因高等理工研究院, 东莞 523808, 中国

通讯作者:
王东 E-mail: dongwang@imr.ac.cn

薛鹏 E-mail: pxue@imr.ac.cn

文章亮点

(1) 系统地研究了780MPa级SiC/Al–Zn–Mg–Cu复合材料的物相演变规律和力学行为

(2) 阐明了影响高锌含量SiC/Al–Zn–Mg–Cu复合材料力学性能的关键因素

(3) 揭示了超高强度SiC/Al–Zn–Mg–Cu复合材料失效断裂特征和机理

中文摘要

SiC/Al–Zn–Mg–Cu铝基复合材料具有可以媲美钛合金的抗拉强度和弹性模量，作为轻量化结构材料的应用潜力巨大，成为了近年来的研究热点。增加合金元素含量，尤其是Zn元素，是提高Al–Zn–Mg–Cu系铝基复合材料力学性能的有效手段。然而，提高合金含量意味着沉淀相的种类、含量和分布可能发生变化，从而影响复合材料的力学性能和断裂行为。本文旨在开发一种超高强度铝基复合材料，阐明影响其力学性能的关键因素，为材料组织调控提供理论基础。本研究采用粉末冶金和热挤压变形的方法，制备了含12%SiC（体积分数）颗粒的SiC/Al–13.3Zn–3.27Mg–1.07Cu（质量分数，%）复合材料，通过微观组织表征、硬度、电导率和力学性能测试系统地优化了固溶和时效处理工艺，研究了第二相演化及其对复合材料微观组织、力学性能和断裂机制的影响规律。结果表明：双级固溶（470°C/1 h + 480°C/1 h）和低温时效（100°C/22 h）处理可以获得第二相充分溶解且纳米析出相均匀分布的微观组织，最佳抗拉强度可达781 MPa。断口分析表明，沿晶断裂和界面脱粘是超高强度SiC/Al–Zn–Mg–Cu复合材料的主要断裂机制。SiC/Al界面和高角度晶界处存在无析带，是限制复合材料强度提高的主要因素。界面反应产物MgO以及第二相MgZn₂和Cu₅Zn₈优先在SiC/Al界面形核并长大，降低界面结合强度，进一步导致界面开裂。

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Research Article

Effect of heat treatment on the microstructure, mechanical properties and fracture behaviors of ultra-high-strength SiC/Al–Zn–Mg–Cu composites

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Abstract

Abstract

A high-zinc composite, 12vol% SiC/Al–13.3 Zn–3.27 Mg–1.07Cu (wt%), with an ultra-high-strength of 781 MPa was successfully fabricated through a powder metallurgy method, followed by an extrusion process. The effects of solid-solution and aging heat treatments on the microstructure and mechanical properties of the composite were extensively investigated. Compared with a single-stage solid-solution treatment, a two-stage solid-solution treatment (470°C/1 h + 480°C/1 h) exhibited a more effective solid-solution strengthening owing to the higher degree of solid-solution and a more uniform microstructure. According to the aging hardness curves of the composite, the optimized aging parameter (100°C/22 h) was determined. Reducing the aging temperature and time resulted in finer and more uniform nanoscale precipitates but only yielded a marginal increase in tensile strength. The fractography analysis revealed that intergranular cracking and interface debonding were the main fracture mechanisms in the ultra-high-strength SiC/Al–Zn–Mg–Cu composites. Weak regions, such as the SiC/Al interface containing numerous compounds and the precipitate-free zones at the high-angle grain boundaries, were identified as significant factors limiting the strength enhancement of the composite. Interfacial compounds, including MgO, MgZn₂, and Cu₅Zn₈, reduced the interfacial bonding strength, leading to interfacial debonding.
- metal matrix composites;
- heat treatment;
- interfacial reaction;
- mechanical properties;
- fracture mechanism

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