5 mass%TiB_(2)/Al-4.5Cu-xSc-yZr复合材料的微观组织和力学性能  

Microstructure and mechanical properties of 5 mass%TiB_(2)/Al-4.5Cu-xSc-yZr composites

作　　者：祝捷[1] 王培卿 薛彦庆 陈易山 张晗 郝启堂[2] 李新雷[2] ZHU Jie;WANG Pei-qing;XUE Yan-qing;CHEN Yi-shan;ZHANG Han;HAO Qi-tang;LI Xin-lei(Air Traffic Control and Navigation College,Air Force Engineering University,Xi’an 710051,China;State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710012,China)

机构地区：[1]空军工程大学空管领航学院,陕西西安710051 [2]西北工业大学材料学院凝固技术国家重点实验室,陕西西安710012

出　　处：《材料热处理学报》2023年第3期41-51,共11页Transactions of Materials and Heat Treatment

基　　金：陕西省重点研发计划(2021ZDLGY14-07);咸阳市秦创原科技创新专项(L2022-QCYZX-GY-017)。

摘　　要：颗粒增强铝基复合材料的室温韧性和高温强度是制约其应用的主要瓶颈,寻求时效析出相的高温稳定和促进增强颗粒的均匀分布是同步解决该问题的潜在途径之一。采用对掺熔盐反应法原位制备了5 mass%TiB_(2)/Al-4.5Cu-xSc-yZr复合材料,研究了微量添加Sc、Zr元素对TiB_(2)/Al-4.5Cu复合材料微观组织和力学性能的影响。结果表明:Sc和Zr元素的联合添加既能促进TiB_(2)的均匀分布又能明显抑制铸造缺陷,多级热处理工艺进一步促进了θ′-Al_(2)Cu和Al_(3)(Sc,Zr)相的稳定析出,所制备的5 mass%TiB_(2)/Al-4.5Cu-0.2Sc-0.2Zr复合材料的室温抗拉强度达到了385.1 MPa,断裂伸长率为8.6%,300℃下,抗拉强度达到了167.6 MPa,断裂伸长率为9.3%。The room temperature toughness and high temperature strength of particle reinforced aluminum matrix composites are the main bottlenecks restricting their application.Seeking the high temperature stability of aging precipitates and promoting the uniform distribution of reinforced particles is one of the potential ways to simultaneously solve this problem.The 5 mass%TiB_(2)/Al-4.5Cu-xSc-yZr composites were prepared in situ by the modified mutual commingling molten salt reaction method.The effects of trace addition of Sc and Zr elements on microstructure and mechanical properties of the TiB_(2)/Al-4.5Cu composites were studied.The results show that the trace addition of Sc and Zr elements can not only promote the uniform distribution of TiB_(2),but also significantly inhibit the casting defects.The multi-stage heat treatment process further promotes theθ′-Al_(2)Cu and Al_(3)(Sc,Zr)phases with the stable precipitation.At room temperature,the tensile strength of the prepared 5 mass%TiB_(2)/Al-4.5Cu-0.2Sc-0.2Zr composite reaches 385.1 MPa,and the elongation is 8.6%.At 300℃,the tensile strength reaches 167.6 MPa,and the elongation is 9.3%.

关 键 词：TiB_(2)/Al-Cu复合材料 对掺熔盐反应法 微观组织 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]