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本文采用金相显微镜,x-射线衍射仪和透射电镜,研究了约束加热温度对近等原子比NiTi合金室温组织和微观结构的影响。结果表明:随约束加热温度的升高,合金的室温组织和微观结构将会发生明显的变化。低温约束加热时,合金的室温组织与未经约束加热时相同,由母相秈马氏体相组成,马氏体变体呈板条状,但经约束加热处理后,马氏体变体呈现出明显的方向性;较高温度约束加热时,室温组织由R相和马氏体相组成,并有位错亚结构存在,进一步提高约束加热温度,则其室温组织又由母相和马氏体相组成。文中对组织变化的原因进行了较详细的讨论,认为与约束加热时形成的内应力场有关。
In this paper, the influence of restrained heating temperature on the microstructure and microstructure of near-atomic ratio NiTi alloy was studied by means of metallographic microscope, x-ray diffraction and transmission electron microscopy. The results show that the microstructure and microstructure of the alloy will change obviously with the increase of the restraining heating temperature. At low temperature, when heated, the microstructure of the alloy is the same as that of the untempered heating, and the martensite phase is composed of the parent phase, while the martensite phase is lath-shaped. However, the martensite phase change appears after heat treatment And the obvious directionality. When heated by higher temperature, the room temperature structure is composed of R phase and martensite, and there is dislocation substructure to further increase the constraint heating temperature, then the room temperature tissue is composed of mother phase and Markov Body phase composition. The reasons for the organizational change are discussed in more detail in the paper, which are considered to be related to the internal stress field formed when the heating is restrained.