液态急冷Fe_(70)Cr_(18)Mo_2SiB_2在700—1150℃退火中可生成M_2B,M_3B_2和M_(23)B_6硼化物。M_2B随温度的升高,由Fe_2B为主,经Fe_2B和Cr_2B的平衡共存,逐步被Cr_2B所取代。Cr_2B可由Fe_2B通过原子置换和结构调整转变而成,残余Fe_2B以层错形式的薄片夹在(Cr,Fe)_2B(100)面之间,M_3B_2实际为Mo_(1+x)(Fe,Cr)_(2-x)B_2(0≤x≤1),x随温度上升而连续增大。
The formation of borides M_2B, M_3B_2 and M_(23)B_6 may be carried outfrom the melt-quenched Fe_(70)Cr_(18)Mo_2SiB_9 during 700-1150℃ annealing. As the tem-perature raising, the M_2B, the majority being Fe_2B, may be gradually replaced byCr_2B via the co-existence between Fe_2B and Cr_2B. The Cr_2B may be formed by transformation of Fe_2B through the atomic substitution and structural adjustment. Thethin slice of remaining Fe_2B is sandwiched between (100) faces of (Cr,Fe)_2B asstacking fault. The M_3B_2 is virtually composed of the Mo_(1+x)(Fe,Cr)_(2-x)B_2 where x(0≤x≤1) increases with the increase of temperature.
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