Characterization of Ni–Ti shape memory alloys prepared by powder metallurgy

• Compacting pressure and Cr and Al addition did not affect transformation temperatures.
• Vickers hardness increased with increasing of Cr and Al additions.
• Porosity decreased with increasing of compacting pressure and Cr and Al addition.
• Increasing of particle size increased apparent porosity of sintered samples.
• Corrosion rate decreased with increasing of Cr and Al additions.

In this research, study of the effect of compacting pressure and Cr and Al additions on the properties of Ni–Ti shape memory alloys prepared by powder metallurgy compared with the commercial cast-deformed reference Archwires were conducted. It was found that; the transformation temperatures, phase structures and hardness of the samples prepared by powder metallurgy resemble to that of commercial Thermal reference Archwire especially in containing Martensite and Austenite structure. Also, the compacting pressure and additions of Cr and Al showed negligible effect on the transformation temperatures, Vickers hardness values increased with increasing of Cr and Al additions, porosity percentages decreased with increasing of compacting pressure and addition of Cr and Al and finally corrosion rate decreased with increasing of Cr and Al additions.