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利用透射电子显微镜原位拉伸实验观察Fe-Ni-V-C合金中α马氏体的形核过程,并利用原位冷却跟踪实验证实所观察到的特殊的位错组态是马氏体核胚.在相变过程中,一个核胚转变为一个小叶片,一群平行的叶片组成一个大马氏体片.马氏体相变过程是往复切变过程,相邻核胚往往以相反的方向切变.采用约化胞方法确定观察到的马氏体核胚的晶体结构为面心正交,采用马氏体形核机制解释了马氏体核胚晶体结构.晶体学分析证实了所提出的马氏体形核机制:发夹形位错的层错化是3个相邻密排面之间的错动,而不是两个相邻密排面之间的错动.
The nucleation process of α-martensite in Fe-Ni-VC alloy was observed by transmission electron microscope in-situ tensile test. The in-situ cooling tracking experiment confirmed that the observed special dislocation configuration was martensite In the process of phase transformation, a nuclear embryo turns into a small leaf and a group of parallel leaves form a large martensite slice. The martensitic transformation process is a reciprocating shear process, and adjacent nuclei are often cut in the opposite direction The crystal structure of the observed martensite nuclei was determined by the reduction of cell method and the martensite nucleation mechanism was used to explain the crystal structure of the martensite nuclei.The crystallographic analysis confirmed the proposed horse The nucleation mechanism of the body: The layer misalignment of hairpin dislocations is the misalignment between three adjacent dense surfaces, rather than the misalignment between two adjacent dense surfaces.