Effect of Rolling Reduction on Mechanical Property in Cast Ti-rich Ti-Ni Shape Memory Alloy

The study describes the effect of cold rolling reduction of a cast Ti-rich Ti-Ni shape memory alloy (SMA) plate from a self-propagation high temperature synthesis (SHS) ingot. The composition of the ingot is Ti-49.8at% Ni. SMA plates were cast by lost-wax process from SHS ingot. Specimens were cold rolled by rolling machine. The cold rolling ratio is 0% (no cold rolling) and 10%. Differential scanning calorimetry (DSC) and tensile test specimens were spark-cut from casting plates. Heat treatment conditions are 400°C, 500°C and 600°C for one hour respectively. Transformation temperatures were measured by DSC at several heat treatment and cold rolling conditions. Mechanical properties were measured by tensile test. In this study we investigated the effect of cold rolling of cast Ti-rich Ti-Ni SMAs. In 10% cold rolling specimens, shape memory characteristics of casting specimen were improved.