求出Co,Co-14Ni和Co-3.5Cu合金在M_s时的层错能,以它们的相变驱动力讨论ε马氏体的形核机制.在极轴机制中相变能垒应包括母相的层错能以及不全位错之间的弹性交互作用能;相变驱动力使位错以0.4V_c(V_c为声速)的速度移动,由位错动能克服能垒.这对层错能较高的Co尚能符合,但对层错能较小的Co-14Ni和Co-3.4Cu合金,它们的相变驱动力很小,极轴机制就不能适用,只可能以层错自发形核.
The stacking-fault energy (SFE) at M_s temperature in Co, Co-14Ni and Co-3.5Cu alloys are given and the nucleation mechanism of ε-martensite is discussedwith respect to their driving forces. The transformation barrier in pole mechanismmight include the SFE of parent phase as well as the interaction energy betweenimperfect dislocations, the driving force pushes the dislocations to glide with aspeed about 0.4 of that of sound that provides the dynamic energy to overcomethe transformation barrier. The Seeger's pole mechanism may be effective for themetals with higher SFE like Co, but inavailable for the Co-14Ni and Co-3.5Cualloys with low SFE in 10~(-1) order of magnitude in which the spontaneous nu-cleation of fault will be applicable.
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