液相网络及相对密度对SiCp/2024复合材料显微组织与力学性能的影响

doi:10.11896/cldb.21120017

材料导报

2023, Vol. 37

Issue (14): 21120017-6 https://doi.org/10.11896/cldb.21120017

金属与金属基复合材料

液相网络及相对密度对SiC_p/2024复合材料显微组织与力学性能的影响

李小龙, 王坦, 左孝青^*, 代彪, 周芸

昆明理工大学材料科学与工程学院,昆明 650093

Effects of Liquid Network and Relative Density on Microstructure and Mechanical Properties of SiC_p/2024 Composites

LI Xiaolong, WANG Tan, ZUO Xiaoqing^*, DAI Biao, ZHOU Yun

Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

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摘要为获得高力学性能的SiC_p/2024复合材料,本工作采用粉末冶金法制备了37%(体积分数)SiC_p/2024复合材料,研究了热压温度及二次热压对复合材料组织及力学性能的影响。结果表明:热压温度为530 ℃时,复合材料具有适中的液相含量(3.28%,体积分数)及相对密度(99.21%),T6热处理态复合材料的力学性能达到了较高水平,抗拉强度和延伸率分别为480 MPa和0.216%;在此基础上,采用540 ℃二次热压进一步细化与分散了复合材料中的液相网络,其相对密度从一次热压的99.30%提高到了99.45%,二次热压T6热处理态复合材料的力学性能达到了最高水平,抗拉强度和延伸率分别为540 MPa和0.515%。分析表明,复合材料中适中、细小分散的液相网络及较高的相对密度是获得具有良好力学性能的SiC_p/2024复合材料的关键。

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	李小龙
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关键词: SiC_p/2024复合材料粉末热压液相网络相对密度力学性能

Abstract: In order to obtain SiC_p/2024 composites with high mechanical properties, 37vol% SiC_p/2024 composites were prepared by powder metallurgy method in this work. The effects of hot pressing temperature and secondary hot pressing on microstructure and mechanical properties of the composites were studied. The results show that when the hot-pressing temperature is 530 ℃, the composite has a moderate liquid phase (3.28vol%) and relative density (99.21%), and the mechanical properties of T6 heat-treated composites reached a higher level (480 MPa tensile strength and 0.216% elongation). Furthermore, the liquid phase network in the composites was further refined and dispersed by secondary hot pressing at 540 ℃, the relative density increased from 99.30% to 99.45%, the mechanical properties of the T6 composites reached the hig-hest level (540 MPa tensile strength and 0.515% elongation). The results analysis shows that a medium,fine and dispersed liquid phase network and a higher relative density in the composites is the key to the SiC_p/2024 composites with good mechanical properties.

Key words: SiC_p/2024 composite powder hot pressing liquid phase network relative density mechanical property

出版日期: 2023-07-25 发布日期: 2023-07-24

ZTFLH:

TB333

基金资助: 国家自然科学基金(51861020;51741103)

通讯作者: *左孝青,昆明理工大学材料科学与工程学院教授,博士研究生导师。1985年华南理工大学金属材料及热处理专业本科毕业,1994年重庆大学金属压力加工专业硕士毕业,2006年昆明理工大学材料学专业博士毕业。主要从事多孔金属材料、金属基复合材料及有色金属材料研究,发表论文112篇,SCI、EI收录50余篇,授权国家发明专利40余项。zxqdzhhm@163.com

作者简介: 李小龙,2017年6月毕业于聊城大学,获得工学学士学位。现为昆明理工大学材料科学与工程学院硕士研究生,主要从事铝基复合材料研究。

引用本文:

李小龙, 王坦, 左孝青, 代彪, 周芸. 液相网络及相对密度对SiC_p/2024复合材料显微组织与力学性能的影响[J]. 材料导报, 2023, 37(14): 21120017-6.
LI Xiaolong, WANG Tan, ZUO Xiaoqing, DAI Biao, ZHOU Yun. Effects of Liquid Network and Relative Density on Microstructure and Mechanical Properties of SiC_p/2024 Composites. Materials Reports, 2023, 37(14): 21120017-6.

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http://www.mater-rep.com/CN/10.11896/cldb.21120017 或 http://www.mater-rep.com/CN/Y2023/V37/I14/21120017

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