<正> 许多研究者采用金属氢化物与石墨反应、区域熔炼或粉末烧结等方法制备MCx相样品,用X光衍射、核磁共振或透射电镜等技术进行研究时发现,在VC_(0.77)-VC_(0.88)之间有一三角系或单斜系的有序V_6C_5相;在VC_(0.87)-VC(0.90)之间有一立方系的有序V_8C_7相;在NbC_(0.67)-NbC_(0.97)之间有一与有序V_6C_5类似的Nb_6C_5相。此外,长时间时效后,在Fe-1V-0.02Nb-0.2C合金中沉淀的碳化钒中发现有序V_6C_5相;在Ni-4V-0.4C合金中发现有序V_6C_5相;在中碳合金钢中发现有序V_6C_5和有序(V,Ti)_6C_5相;在热强钢中发现有序V_8C_7相。
The precipitated niobium carbide is revealed to be ordered in ferrite in 3 different microalloyed steels containing Nb about 0.08—0.24%. This ordered niobium carbide may be formulated as Nb_8C_7~′(NbC_(0.875)~′) which is formed by ordered omission of its C atoms. With the reciprocal lattice indexes or orientation relationship of transformation matrix between the ordered niobium carbide and α-Fe, the composite electron diffraction patterns can be conveniently indexed.
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| [13] | De Novion, C.H. |
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