运用盐-金属反应法制备了亚微米TiB2颗粒增强铝基复合材料(TiB2/AC8A).TiB2颗粒通过钛盐和硼盐与铝合金反应原位生成.对复合材料进行了显微组织观察和高温蠕变性能实验.原位TiB2颗粒的尺寸约为0.5 μm,近似呈球形.TiB2/AC8A复合材料具有优异的高温蠕变性能.10 ω/% TiB2原位颗粒(～0.5 μm)增强AC8A复合材料的蠕变抗力比10 φ/% SiCp(1.7 μm)外加颗粒增强Al复合材料至少要高两个数量级.10 ω/% TiB2/AC8A复合材料表现出高的名义应力指数(11.7～12.5)和名义激活能(265 kJ/mol),其稳态蠕变数据能够用应力指数为8的亚结构不变模型和门槛应力来解释.TiB2/AC8A复合材料的蠕变断裂行为符合Monkman-Grant关系式.
Aluminum-based metal matrix composites (MMCs) reinforced with sub-micron TiB2 particulates (TiB2/AC8A) were fabricated by means of the reaction processing method. TiB2 particulates were formed in-situ through the reaction of Ti and B bearing salts and aluminum alloy. Metallography and high-temperature creep tests were used to characterize the microstructure and mechanical properties of these composites. The results show that in-situ TiB2 particulates formed have an average size of 0.5 μm and they exhibit spherical forms. Constant-load creep tests reveal that the TiB2/AC8A composites exhibit excellent mechanical properties. The creep resistance of the 10 wt.% TiB2/AC8A composite (~0.5 μm) is at least two orders of magnitude higher than that of the 10 vol.% SiCp (1.7 μm)/Al composite. Furthermore, the 10 wt.% TiB2/AC8A composite exhibits the apparent stress exponent ranging from 11.7 to 12.5 and the apparent activation energy of 265 kJ/mol. The creep data of the composite was rationalized by using the substructure-invariant model with a stress exponent of 8 and a threshold stress. The creep rupture behavior of the 10 wt.% TiB2/AC8A composite is satisfactorily described by Monkman-Grant relation.
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