等温锻造对CNTs/SiC_(p)混杂增强铝基复合材料力学性能的影响  

Effect of Isothermal Forging on Mechanical Properties of CNTs/SiCp Hybrid Reinforced Aluminum Matrix Composites

作　　者：许慧 杜志楠 张艺镡 刘雅菲 徐严谨 XU Hui;DU Zhinan;ZHANG Yitan;LIU Yafei;XU Yanjin(Institute of Metal Materials Technology,AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]中国航空制造技术研究院金属材料技术研究所,北京100024

出　　处：《航空制造技术》2024年第8期38-44,共7页Aeronautical Manufacturing Technology

基　　金：中国航空制造技术研究院院基金(KS522402)。

摘　　要：强韧性匹配是金属基复合材料需解决的关键问题,强度的提升往往导致韧性损失,而混杂增强铝基复合材料可以综合各组元的优点,起到同时增强的协同混杂效应。为探索等温锻造工艺对混杂增强铝基复合材料力学性能的影响,采用真空烧结工艺制备了CNTs/SiC_(p)混杂增强Al-Cu-Mg铝合金复合材料,其CNT和SiC的质量分数分别为0.7%和10%,分别在450℃、460℃、470℃进行了80%变形量的等温锻造加工,研究了等温锻造对复合材料微观组织和力学性能的影响规律。结果表明混杂增强铝基复合材料经过等温锻造加工后的塑性相比烧结态锭坯发生明显上升,材料经470℃等温锻造后同比具有最好的综合力学性能,相比烧结态锭坯的抗拉强度提升了48%,延伸率提升了260%。等温锻造后,组织中的絮状相及细长形SiC颗粒在垂直于锻造方向上发生流线型分布,对材料的拉伸力学性能起到了强化作用。本研究为后续新型高性能铝基复合材料的开发与应用提供一定理论支撑。Hybrid reinforced aluminum matrix composites can integrate the advantages of each component and exert a synergistic reinforcing effect.CNTs/SiCp reinforced Al-Cu-Mg aluminum alloy composite was prepared by vacuum sintering process,with the mass fraction of CNTs and SiC being 0.7%and 10%,respectively.Isothermal forging at 450℃,460℃and 470℃was carried out with high deformation degree,and the influence of isothermal forging on microstructure and mechanical properties of composite was studied.It was found that the plastic properties of hybrid reinforced aluminum matrix composites after isothermal forging were obviously improved compared with sintered ingot,and the composites after 470℃isothermal forging had the best comprehensive mechanical properties than sintered ingot,with an increase of 48%in tensile strength and 260%in elongation.After isothermal forging,the flocculation and slender SiCp in the matrix arranged along the flow line,which strengthened the tensile mechanical properties of the material.The research in this paper can provide a certain theoretical support for the subsequent development and application of new high-performance aluminum matrix composites in the future.

关 键 词：混杂增强 铝基复合材料 等温锻造 力学性能 成形工艺 

分 类 号：TB333[一般工业技术—材料科学与工程] TG316[金属学及工艺—金属压力加工]