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基于微观相场动力学模型,以Ni75Al6.0V19.0合金为对象,研究了其相变过程的扩散通道取向效应及其通道形成过程中相间作用机理.研究表明:在弹性错配应力场作用下,V原子会沿着[100]方向形成扩散通道,形成沿其短轴方向生长的DO22相,从而促使Al原子在相邻处也沿着相同的方向形成扩散通道,产生L12相的定向生长;应力的升高,取向效应先增强再减弱;在较大应力下,V原子的平均占位较晚达到稳定、Al原子则较早.
Based on the microscopic phase field dynamics model, the orientation effect of diffusion channels and the interphase interaction mechanism during the phase transition of Ni75Al6.0V19.0 alloy were studied. The results show that under the action of elastic mismatch stress field , V atoms form diffusion channels along the [100] direction to form the DO22 phase growing in the direction of its short axis, thereby promoting Al atoms to form diffusion channels along the same direction and adjacent to each other, resulting in the directional growth of the L12 phase. With the increase of stress, the orientation effect first increases and then decreases. Under the larger stress, the average occupancy of V atom reaches a stable state later, and the Al atom is earlier.