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本文通过对未经训练和已经充分训练的量Ni—49.7 at%Ti合金在相变过程中电阻,内耗,模量以及相变应变的原位测量和对比,证实了该合金经充分训练可由I/C(无公度/公度)转变提供完全可逆的双程形状记忆效应.研究了该合金在双程形状记忆训练过程电阻及相变阻力的变化.结果表明,双程形状记忆效应的训练过程,实际上就是在温度及应力的复合作用下,I/C相变逐渐被诱导、总的相变阻力下降并趋于稳定的过程.在训练过程中,高相变阻力的过程逐渐被抑止,而低相变阻力的过程逐渐发展并成为主要过程;因此使相变过程变得完全可逆,正反相变均按阻力最小的惯习面进行,试样即具有双程形状记忆效应.
In this paper, we measured and compared the resistance, internal friction, modulus and phase transformation strain of untreated and well-trained Ni-49.7 at% Ti alloy during phase transformation. It is proved that the alloy can be fully trained by I / C (uncoordinated / common degree) transformation to provide a completely reversible two-way shape memory effect.The change of resistance and phase transformation resistance of the alloy during two-way shape memory training was studied.The results show that the training of the two-way shape memory effect Process, in fact, under the combined action of temperature and stress, the phase transition of I / C is induced gradually and the total phase change resistance is decreased and tends to be stable. During the training, the process of high phase-change resistance is gradually suppressed , While the process of low phase transformation resistance gradually develops and becomes the main process; therefore, the phase transformation process becomes completely reversible, and the positive and negative phase transitions are performed according to the habit of the least resistance. The sample has the two-way shape memory effect.