论文部分内容阅读
运用盐-金属反应法制备了亚微米TiB_2 颗粒增强铝基复合材料(TiB_2/AC8A)。TiB_2 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。TiB_2/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/% TiB_2/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。TiB_2/AC8A 复合材料的蠕变断裂行为符合Monkman-Grant 关系式。
Submicron TiB_2 particle reinforced aluminum matrix composites (TiB 2 / AC 8 A) were prepared by salt-metal reaction. TiB 2 particles are formed in situ by the reaction of titanium salts and boron salts with aluminum alloys. The microstructure of the composite was observed and the creep behavior at high temperature was tested. The size of in situ TiB2 particles is approximately 0.5 μm, approximately spherical. TiB_2 / AC8A composites have excellent high temperature creep properties. 10 ω /% TiB2 particles in situ (~ 0.5 μm) Enhanced creep resistance of AC8A composites is at least two orders of magnitude higher than that of 10 φ /% SiCp (1.7 μm) plus particle reinforced Al composites. The 10 ω /% TiB 2 / AC 8 A composite exhibits high nominal stress index (11.7-12.5) and nominal activation energy (265 kJ / mol), and its steady-state creep data can be expressed in a substructure-invariant model with a stress index of 8 And the threshold stress to explain. The creep rupture behavior of TiB_2 / AC8A composites is in accordance with the Monkman-Grant relationship.