Abstract：The influence of tensile pre- deformation on microstructure, shape memory effect and damping capacity was investigated for Cu- 8. 8Al- 5. 9Mn- 0. 3La alloy. Experimental results showed that the orientation of martensite has been complete when the deformation is 5%; deformation twins and martensite rotation crushing are produced when the pre- deformation continues to increase, which breaks the continuity of martensitic interface. The pre- deformation increases the temperature of martensitic transformation, and when the pre- deformation is beyond 5. 0%, a large number of dislocations produced by the deformation increase the friction resistance of the phase transformation, which leads to the steeply rising of the transformation thermal hysteresis. When the deformation amount is below 3. 5%, the increase of deformation can increase the capability of martensitic reverse phase transition and the peak value of damping increases. However, the excessive deformation causes martensitic discontinuity to block the reverse martensitic transformation and thus the damping peak decreases.
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2018, Vol. 25 
