Characterization of Ni-Ti shape memory alloys

Abstract EN

Master Samples NiTi (without additives) prepared using powder mixture of 55 wt% Ni and 45 wt% Ti by; mixing in a ball mill for two hours, then compacted at 300, 400, 500, 600, 700 and 800 Mpa, and then sintered at 950 oC for 9 hours under controlled atmosphere (argon).

The same approach was made for the samples with Mo and Co additions compacted at 800 Mpa.

From the results, it was found that compaction pressure has essential effect on; increasing hardness, decreases porosity percentage and corrosion rate.

XRD test shows that the sintered samples are consisting of two phases martensite and austenite at room temperatures (mean thermal NiTi shape memory alloy).

The Results shown that the hardness property and corrosion rate increased with all weight percentage of additives Mo and Co, and decreases porosity percentage.