Preparation of copper based shape memory alloy via mechanical alloying technique

A shape memory alloy powder was prepared using a mechanical alloying technique. Four stages of formation of the mechanically alloyed powder have been identified, namely, layered structure formation, deformation of the layered structure, disappearance of the layered structure, and the formation of alloyed powder. It was found from X-ray diffraction patterns that the alloyed shape memory powders started to form after mechanical alloying for 1·8 ks. The γ phase of the alloyed powders can be distinctively detected after 3·6 ks mechanical alloying. The shape memory effect has been observed in specimens prepared using this mechanical alloying technique. It was observed that a shorter diffusion time was required for the powder to be mechanically alloyed in comparison with conventional mixing.