采用大塑性变形法制备氧化物弥散强化铂铑(Pt5Rh ODS)复合材料,对材料进行了高温蠕变试验.结果表明,复合材料在高温低应力条件下,表现出的名义应力指数随温度变化较小,名义激活能高于纯Pt和Pt10Rh合金,而且比常规合金材料具有更好的高温蠕变性能.复合材料的高温蠕变性能用晶界反应控制来解释,说明复合材料的蠕变受到扩散蠕变机制控制.复合材料的蠕变断裂行为符合连续蠕变损伤中的内截面损伤模型,蠕变断裂特征为沿晶断裂.
Adopting a large plastic deformation process,the dispersion strengthened PtSRh composite was prepared.The microstructure of the composite was analyzed by SEM,and the high temperature creep tests were carried out by a self-made high temperature creep test facility.The experimem results show that at high temperature and under low load the stress exponent of the dispersion strengthened Pt5Rh alloy does not change obviously with increasing of the temperature,and its apparent activation energy is much higher than those of pure platinum and Pt10Rh alloy.The high temperature creep properties of the dispersion strengthened Pt5Rh are better than those of conventional alloys.The creep mechanism of the dispersion strengthened Pt5Rh belongs to the proliferation creep mechanism; the creep fracture at high temperatures presents the brittle fracture.
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