【摘要】 Ｆｅ－６９．７％（ａｔｏｍ）Ｃｒ合金经５００℃时效４年后，获得单一α＇相结构，并测定了它在低温下合金的穆斯堡尔谱。结果表明：在室温３００Ｋ穆斯堡尔谱为一单线洛仑兹线型，降低温度其半宽度也随着展宽，在７７Ｋ时超精细场达３０７２．２０ｋＡ／ｍ；超精细场数值随温度降低而增大，其变化规律与顺磁体模型理论值变化曲线相似，说明α＇相在７７Ｋ以上为一顺磁质，从１２００℃至室温通过变温热循环加速了Ｃｒ句晶界扩散以及顺磁α＇相在Ｆｅ－２４．６％Ｃｒ－５．０％Ａｌ合金中析出，并导致合金脆化。更多还原

【Abstract】 A α’-phase structure is got after Fe-69.7%(atom)Cr alloy aging for four years at 500℃. Its Mossbauer spectrum characteristic is determined. The results indicate the Mossbauer spectrum obtained at 300 K is a pure Lorentzian lineshape, the overall width of composite absorbed spectrum increases considerable with temperature droping, and the range of superfine field reaches about 3 072.20kA/m at 77 K. The behaviour of superfine field is similar to that of ideal paramagnetic model. This phenomenon demonstrates that the α -phase is a paramagnet above 77K. By thermal cycling treatment from 1200 ℃ to room temperature, a considerable acceleration of Cr atom diffusion to grain boundaries and α’-phase precipitation in Fe- 24.6%Cr- 5 %Al alloy occurres, and which cause the alloy embrittlement.更多还原