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含１５％～２５％Ｃｒ，４％～５％Ａｌ的ＦｅＣｒＡｌ合金在４００～５００℃时效后发生４７５℃脆化，处理温度高于９００℃时发生高温脆化，但在中温（５４０～９００℃）处理后能获得较高的塑性和较低的硬度，σ相脆化的发展不明显。中温处理还能部分消除合金中已经产生４７５℃的脆性和高温脆性。含０２％～０４％Ｙ的ＦｅＣｒＡｌＹ合金有很宽的高塑性区（５００～１３００℃），高温脆化几乎不发生，４７５℃脆化的发展缓慢。已经产生的４７５℃脆性在５００～５６０℃处理后完全消除。钇的这些作用与合金中碳原子被ＹＦｅ相质点俘获、不发生碳化物析出过程有关。
The FeCrAl alloy containing 15% ~ 25% Cr and 4% ~ 5% Al occurred 475 ℃ embrittlement after aging at 400 ~ 500 ℃ .High temperature embrittlement occurred when the treatment temperature was higher than 900 ℃, ) Treatment can get higher plasticity and lower hardness, sigma phase embrittlement development is not obvious. Intermediate temperature treatment can also partially eliminate the alloy has been produced 475 ℃ brittleness and high temperature brittleness. FeCrAlY alloys containing 02% ~ 04% Y have a wide range of high plasticity (500 ~ 1300 ℃), high temperature embrittlement almost does not occur, and 475 ℃ embrittlement slow development. The 475 ° C brittleness that has been produced is completely eliminated after treatment at 500-560 ° C. These effects of yttrium and the alloy carbon atoms are Y -Fe phase particle capture, the occurrence of carbide precipitation process.