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在含０２％～１４％Ｙ的Ｆｅ１５Ｃｒ４ＡｌＹ合金中，１～１０μｍ的ＹＦｅ相质点弥散分布，其硬度高于α相的２倍，组成可用Ｙ２（Ｆｅ７６Ｃｒ１２Ａｌ１１Ｓｉ）１７表示。ＹＦｅ相强烈俘获α相中的碳原子，使合金在固溶处理状态下的Ｓｎｏｅｋ内耗峰消失，在７００℃下析出碳化物。ＹＦｅ相质点通过阻止晶粒长大而抑制合金的高温脆化，通过俘获碳原子而延缓４７５℃脆性发展。此外，它们还有提高热强性和抗氧化性的作用。在高温下，ＹＦｅ相质点直至１３３０℃时仍保持其稳定性，在１３５０℃时发生共晶熔化，这时，ＹＦｅ相改善性能的各种作用突然消失。
In 0 2% ~ 1 4% Y Fe15Cr4AlY alloy, 1 10μm Y Fe particles dispersed, the hardness is 2 times higher than the α phase, the composition available Y2 (Fe76Cr12Al11Si ) 17 said. Y -Fe phase strongly capture the α-phase carbon atoms, so that the alloy in solution state of Snoek internal friction peak disappear at 700 ℃ precipitation of carbides. The Y-Fe phase particles inhibit the high temperature embrittlement of the alloy by preventing grain growth and retard the development of brittleness at 475 ° C by trapping carbon atoms. In addition, they also have the role of improving the heat and oxidation resistance. At high temperatures, the Y-Fe phase particles remain stable until 1330 ° C, eutectic melting occurs at 1350 ° C, at which point the various effects of the Y-Fe phase in improving performance suddenly disappear.