材料期刊网

从唯象理论出发,推导了立方相向正方、斜方和以不同单斜结构描述的马氏体转变的一般公式。对一种典型热弹性材料-TiNi,提出若干种可能的马氏体相变模型,进行计算机模拟。结果,对于马氏体结构模型为α=0.2889,b=0.4120,c=0.4622nm,β=96.8°的TiNi[简称TiNi(β)]的相变孪生模型是K_1=(111)_M,(111)_M(第Ⅰ类孪晶)和η_1=[110]_M(第Ⅱ类孪晶);对于马氏体结构模型为α=0.2885,b=0.4622,c=0.4120nm,γ=96.8°的TiNi[简称TiNi(γ)]是K_1=(111)_M,和(111)_M(第Ⅰ类孪晶).它们满足“相界面是一个平均畸变为零的平面”的条件,并且与有关作者提供的实验数据吻合较好。

The mathematical formula for the martensitic transformation from cubic phase to tetragonal, orthorhombic and monoclinic martensite was derived in the light of phenomenological theory. The computer simulation had been made of a typical thermoelastic material TiNi by advanced several possible martensitic transformation models. They are K_l=(111)_M, (111)_M (twinned crystal type Ⅰ) and η_l=[110]_M (type Ⅱ) on the TiNi(β) where the structural mode of the martensite is characterized by the lattice parameters being a=0.2889, b=0.4120, c=0.4622nm and β=96.8°; and K_l=(111)_M, (111)_M (type Ⅰ)on theTiNi(γ) where the structural mode of the martensite is characterized by the lattice parameters being a=0.2885, b=0.4622,c=0.4120nm and γ=96.8°. Both of them are capable of satisfying the requirements that the interphase interface is the plane of zero average distortion, and are found to be in agreement with the available experimental results given by the other authors.