Investigation of the additives for changing on phases and corrosion behavior of shape memory alloys

Abstract EN

Nickel-Titanium shape memory alloy (Nitinol or NiTi) is a fascinating material for dental applications.

In this work the alloy has been prepared by powder technology and the effect of Mg and Zn additives has been studied on the corrosion rate, in artificial saliva.

Samples (without additives) were prepared using powder mixture of 55 wt.% Ni and 45 wt.% Ti by blending in a ball mill for two hours, then compacted at 800 Mpa, and then sintered at 950 oC for 9 hours under controlled atmosphere (argon).

The same approach was made for the samples with 0.1, 0.2 and 0.3 wt% of Mg and Zn additions.

XRD test shows that the sintered samples are consisting of two phase's martensite and austenite at room temperatures.From the results; it was found Zn additives increase the corrosion rate while Mg additives decrease the corrosion rate.