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利用拉伸实验、电阻-温度曲线测量、X射线衍射、金相与透射电镜观察等方法研究了Cu-18.4Al-8.7Mn-3.4Zn-0.1Zr(原子分数,％)合金应力诱发马氏体的稳定性与可逆性.结果表明:在Ms以上变形,实验合金发生应力诱发β1→M18R转变,但应力诱发马氏体转变很难进行完全,当变形量高达7.5％时,仍存在未发生应力诱发转变的母相.应力诱发马氏体的稳定性和可逆性与变形量大小有关,合金经大变形量变形后,即使在250℃油浴中回复,仍存在未发生逆变的应力诱发马氏体.在一定的变形条件下,经适量变形的应力诱发马氏体具有很高的可逆性和稳定性,实验合金在Ms以上10—50℃温度范围内变形6.5％-9.0％时,相变滞后宽度可达90℃以上,记忆应变>3.5％.
The stress-induced martensitic transformation of Cu-18.4Al-8.7Mn-3.4Zn-0.1Zr (atomic fraction) alloy was investigated by means of tensile test, resistance-temperature curve measurement, X-ray diffraction and metallographic observation and transmission electron microscopy The results show that stress-induced transformation of β1 → M18R occurs in the experimental alloy, but the stress-induced martensitic transformation is difficult to complete. When the deformation is as high as 7.5%, there is still no stress Inducing the transformation of the mother phase stress-induced martensite stability and reversibility and the size of the deformation, the alloy deformation after deformation, even in the 250 ℃ oil bath to recover, there is still no stress-induced horse induced inversion Under certain deformation conditions, the stress-induced martensite with proper deformation has high reversibility and stability. When the experimental alloy is deformed by 6.5% -9.0% in the temperature range of 10-50 ℃ above Ms, Variable hysteresis width of up to 90 ℃, memory strain> 3.5%.