Cu-Al-Ni-Mn-Ti合金相变弛豫特性的研究

Study of phase transition relaxation properties of Cu-Al-Ni-Mn-Ti alloy

文章研究了Cu-Al-Ni-Mn-Ti多晶形状记忆合金的相变弛豫特性。实验结果表明,合金的相变内耗峰实际上由2个不同的内耗峰组成,低温内耗峰的峰值与频率对数呈现峰形函数关系,随升温速率的增加,频率峰向高频方向移动,相变弛豫时间减小;高温内耗峰的峰值与频率倒数成直线关系,随升温速率的增加,直线斜率变大,表明低频测量时升温速率对相界面法向运动的驱动作用更强。

The phase transition relaxation properties of Cu-Al-Ni-Mn-Ti polycrystalline shape memory alloy were studied. The experimental results show that one single internal friction peak observed in the alloy is actually made up of two different internal friction peaks. The maxima of low-temperature internal friction peaks plot a symmetrical peak-like curve in the logarithmic frequency spectrum and the internal friction peak in the frequency spectrum shifts toward high frequencfes with the increase of the heating rate, indicating that phase transition relaxation time decreases~ the maxima of high-temperature internal friction peaks exhibit a linear relation to the reciprocal frequencies, and as the heating rate increases its slope rises, which implies that the heating rate drives the normal movement of phase interface further in low-frequency measurements.