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一、前言:根据 S.J.AsHton 等人的报导:初生α的比例对 IMI679合金机械性能有较大的影响,当初生α少于20%时,合金的塑性急剧下降。为了获得满意的综合性能,必须使合金中的初生α含量至少保持在20%左右。据报导,IMI679合金中的硅化物只有呈均匀弥散分布,而且硅化物粒子尺寸小于1μ时,硅的加入对提高合金的抗蠕变性才是有益的,显然 IMI679合金中初生α的比例、第二相(硅化物)粒子的大小及分布对合金的性能是有影响的。
First, the preamble: According to S.J. AsHton et al. Reported: the proportion of primary α IMI679 alloy mechanical properties have a greater impact, when the primary α less than 20%, the sharp decline in the plasticity of the alloy. In order to obtain a satisfactory overall performance, the alloy must maintain a primary α content of at least about 20%. It is reported that the IMI679 alloy silicide only showed a uniform dispersion distribution, and the size of the silicide particles is less than 1μ, the addition of silicon to improve the creep resistance of the alloy is beneficial, it is clear IMI679 alloy primary α ratio, the The size and distribution of two-phase (silicide) particles have an effect on the properties of the alloy.