【摘要】 液态急冷Fe₇₀Cr₁₈Mo₂SiB₂在700—1150℃退火中可生成M₂B,M₃B₂和M₂₃B₆硼化物。M₂B随温度的升高,由Fe₂B为主,经Fe₂B和Cr₂B的平衡共存,逐步被Cr₂B所取代。Cr₂B可由Fe₂B通过原子置换和结构调整转变而成,残余Fe₂B以层错形式的薄片夹在（Cr,Fe）₂B（100）面之间,M₃B₂实际为Mo_1+x（Fe,Cr）_2-xB₂（0≤x≤1）,x随温度上升而连续增大。更多还原

【Abstract】 The formation of borides M₂B, M₃B₂ and M₂₃B₆ may be carried outfrom the melt-quenched Fe₇₀Cr₁₈Mo₂SiB₉ during 700-1150℃ annealing. As the tem-perature raising, the M₂B, the majority being Fe₂B, may be gradually replaced byCr₂B via the co-existence between Fe₂B and Cr₂B. The Cr₂B may be formed by transformation of Fe₂B through the atomic substitution and structural adjustment. Thethin slice of remaining Fe₂B is sandwiched between （100） faces of （Cr,Fe）₂B asstacking fault. The M₃B₂ is virtually composed of the Mo_1+x（Fe,Cr）_2-xB₂ where x（0≤x≤1） increases with the increase of temperature.更多还原