%0 Journal Article
%T 2024Al/Gr/SiCp复合材料耐热性能研究
%A 严红革
%A 
%A 胡程进
%A 陈吉华
%A 苏斌
%J 湖南大学学报(自然科学版)
%D 2016
%X 研究了采用真空热压法制备的2024Al/Gr/SiCp复合材料高温拉伸性能及长时间热暴露后的室温力学性能，同时对拉伸断口进行分析，探讨了SiC颗粒和石墨对材料耐热性能的影响.结果表明：2024基体合金和2024Al/Gr/SiCp复合材料在200 ℃及以下热暴露时，复合材料的强度下降幅度较小，但基体合金的强度下降幅度明显比复合材料的大，这与增强相SiC颗粒与石墨提高了材料的耐热性能有关.在300 ℃热暴露条件下，2024基体合金和2024Al/Gr/SiCp复合材料的力学性能快速下降.2024Al及其复合材料的高温拉伸性能随拉伸温度升高而下降，在200 ℃及以下温度抗拉强度较好，250 ℃及以上温度抗拉强度快速下降.高温拉伸和热暴露处理后的2024铝合金基体的断裂机制为韧性断裂，2024Al/Gr/SiCp复合材料的断裂机制为基体韧性断裂及石墨断裂、SiC颗粒与界面分离的混合断裂机制.</br>The high temperature tensile properties and room-temperature mechanical properties of 2024Al/Gr/SiCp hybrid composites after long time thermal exposure were studied. The fractures of 2024Al/Gr/SiCp hybrid composites after a long time of thermal exposure at different temperatures were observed by SEM. The results show that the mechanical properties of 2024Al/Gr/SiCp hybrid composites decrease slightly with the increase of exposure time at 200 ℃. The 2024Al shows a greater decline of mechanical properties than the composites, which is attributed to the addition of SiCp particles and flaky graphite. The mechanical properties of the materials decrease rapidly due to the coarsening of precipitates and grain. The tensile strength at elevated temperatures decreases with the increase of test temperature. The 2024Al is characterized by ductile fracture, while the composites are characterized by the ductile fracture of matrix, the tearing of the graphite and the interface between the particles and matrix.
%K 2024Al/Gr/SiC复合材料 热暴露 耐热性能 断裂机制&lt
%K /br&gt
%K 2024Al/Gr/SiCp hybrid composites thermal exposure heat resistant properties fracture mechanism
%U http://hdxbzkb.cnjournals.net/ch/reader/view_abstract.aspx?file_no=20160601&flag=1