采用反应热压法以Al、B2O3、TiO2粉和Al、B、TiO2粉为原料制备了两种(Al2O3+TiB2+Al3Ti)/Al复合材料.后一种原料粉制备的复合材料从基体中析出了细小的Al3Ti相.研究了应变控制原位生成复合材料的室温低周疲劳行为.结果表明,在应变幅较小时(εt≤0.3%),不含Al3Ti析出相的材料表现为循环稳定;而在应变幅较大时(εt≥0.4%),则表现为第一周的循环硬化和随后的循环软化.在所采用的应变幅下,含Al 3Ti析出相的材料均表现为循环稳定.疲劳裂纹萌生部位为Al3Ti相断裂、Al3Ti相与基体的界面开裂和基体中微裂纹.疲劳裂纹穿过基体,绕过Al2O3、TiB2质点扩展.两种复合材料的疲劳寿命均符合Coffin-Manson公式.
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