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利用嵌入原子类型的势函数,通过分子动力学模拟方法研究了单个刃型位错对NiAl热诱发和应力诱发马氏体相变的影响,不受外力时,单个刃型位错的应变区不能诱发马氏体形核;位错在马氏体的长大过程中被继承,并可在相变的驱动下逐渐运动拉应力作用下,3R结构的应力诱发马氏体首先在位错芯附近形核,长大过程中先形成蝶状马氏体,随后位错多余半原子面的中部也发生了马氏体形核.刃型位错降低了应力诱发马氏体形核的激活能,并在相变中起到了塑性协调作用.
Using the potential function of the embedded atomic type, the effect of a single edge dislocation on NiAl thermal-induced and stress-induced martensitic transformation was studied by molecular dynamics simulation. When no external force was applied, the strain zone of single edge dislocation could not Induced martensite nucleation. Dislocation was inherited during the growth of martensite, and under the action of tensile stress, the stress-induced martensite of 3R structure was first formed in the vicinity of the dislocation core During the process of nucleation and growth, butterfly-like martensite was formed first, followed by martensite nucleation in the middle of the dislocated excess semi-atomic plane. The edge dislocation reduced the activation energy of stress-induced martensite nucleation, Change has played a plastic coordination role.