(1.国防科技大学 材料工程与应用化学系，长沙 410073;
2. 航天材料及工艺研究所，北京 100086)
摘 要: 研究了由热等静压工艺制备的B/Al复合材料在300℃和500℃条件下经不同时 间热暴露处理后的力学性能及断口特征，从界面微观特征的角度分析了温度和时间等参数对性能产生影响的原因。实验结果表明：在300℃长时间(50～100h)热暴露后，性能下降幅度约为20%～30%；温度为500℃时，经较短的时间(数小时)热暴露后性能显著下降。微观分 析表明：在300℃长时间热暴露后没有明显的界面反应，在500℃数小时热暴露后出现纤维和基体的界面反应层，界面反应的发生使力学性能降低。
关键字: B/Al复合材料；热暴露；力学性能；断口；界面反应
mechanical properties of
B/Al composite
（1.Department of Materials Engineering and
Applied Chemistry，National University of
Defence Technology，Changsha 410073，China；
2.Aerospace Research Institute of Materials and
Processing Technology，Beijing 100086, China）
Abstract:The effects of thermal exposure on the mechanic al properties of boron fiber reinforced aluminum composite were studied in terms of tensile strength and fracture elongation. The interfacial microstructure was also analyzed by TEM. The results show that there is no severe decrease of mechanical properties after thermal exposure at 300℃ and no interfacial reaction revealed from the TEM micrograph. Thermally exposed at 500℃, the composite begins to lose their strength dramatically after several hours. The TEM study shows that an obvious interfacial reaction layer appears at this time. The fracture patterns an d fractographies of composite under different thermal exposure conditions show t hat as the properties decrease, the fracture routes become less zigzag and the pull-out of boron fiber gradually reduces.
Key words: B/Al composite；thermal expousure; mechanical properties；fractography；interfacial reaction
