Effect of Cold Rolling and Heat Treatment on Microstructure and Mechanical Properties of Pt-0.7Ti Microalloy
The effects of cold rolling, solid solution, aging and annealing treatment on Pt-0.7Ti microalloy were investigated in this study. The microstructures of Pt-0.7Ti microalloy and the precipitated ordered phase Pt8Ti were observed and analyzed by OM, TEM, XRD. The mechanical properties of the alloy were evaluated Vicker micro-hardness. The results showed that micro amount of Ti was an effective element for solid-solution strengthening of Pt, the micro-hardness of 97% deformation for ST and ST+AG samples increased to 214HVand 224HV, respectively, which almost are double that of pure Pt. Micro-amount of long range ordered phase Pt8Ti was precipitated during the heat treatment, but the effect of order hardening in Pt-0.7Ti microalloy was not obvious. The microhardness by large rolling deformation for quenched samples almost unchanged after an annealing below 500°C for 1h, but decreased significantly at 700°C, and the recrystallization temperature was risen by 200°C than that of pure Pt.