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１１００℃预处理的Ｆｅ－１５Ｃｒ－４Ａｌ合金在５００℃时效后迅速脆化，８００℃预处理的合金则无脆化倾向。高温处理的合金有明显的Ｓｎｏｅｋ内耗峰，α相中碳、氮的浓度较高。时效后Ｓｎｏｅｋ峰降低，在主峰的高温侧还分裂出一小峰。这表明４７５℃脆化包括碳、氮析出和α＇相析出两个过程。前者在时效初期有极强的脆化作用，后者在时效数百小时后才显示出微弱的影响。中温预处理的合金无Ｓｎｏｅｋ峰，碳、氮已充分析出，它们不再发生时效析出。含０．２和０．４ｗｔ％Ｙ的合金不出现４７５℃脆性。内耗无Ｓｎｏｅｋ峰，合金中碳化物、氮化物极少。Ｙ－Ｆｅ相俘获杂质原子，消除碳、氮的时效析出，是钇抑制４７５℃脆性的原因。
The pre-treated Fe-15Cr-4Al alloy at 1100 ℃ is rapidly embrittled at 500 ℃ and the pre-treated alloy at 800 ℃ has no embrittlement tendency. High temperature alloy has obvious Snoek internal friction peaks, α phase carbon and nitrogen concentrations higher. The Snoek peak decreases after aging, and a small peak also splits on the high temperature side of the main peak. This shows that 475 ℃ embrittlement includes carbon, nitrogen precipitation and α ’phase precipitation two processes. The former has a very strong embrittlement effect in the early aging, the latter after the aging hundreds of hours before showing weak effects. No pre-treatment temperature Snoek alloy peak, carbon, nitrogen has been fully precipitation, they no longer occur precipitation. The alloys containing 0.2 and 0.4 wt% Y do not exhibit 475 ° C brittleness. No Snoek peak friction, alloy carbide, very little nitride. Y-Fe phase capture impurity atoms, the elimination of carbon and nitrogen precipitation, Yttrium 475 ° C to inhibit the brittleness of the reasons.