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。
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.
作者
李小龙
王坦
左孝青
代彪
周芸
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)
出处
《材料导报》
CSCD
北大核心
2023年第14期154-159,共6页
Materials Reports
基金
国家自然科学基金(51861020,51741103)。
