Effects of aging on the structure and damping behaviors of a novel porous CuAlMn shape memory alloy fabricated by sintering–dissolution method

Effects of aging on the microstructures and damping behaviors of a porous CuAlMn shape memory alloy were studied. It is found that after aging at 350 °C both the damping capacity of the alloy in the martensite state and the height of the internal friction peak arising from the reverse martensitic transformation increase due to the refining of martensitic structure and the annihilation of quenched-in vacancies. It is also found that the atomic ordering and the annihilation of quenched-in vacancies can promote the reverse martensitic transformation to take place, resulting in a significantly decreased temperature of the internal friction peak.