Effect of heat treatment on microstructure and mechanical properties of the Pt–10Ir alloy wires

The influence of heat treatment on the microstructure and properties of Pt-10Ir alloy wire was investigated in order to produce materials with stable qualities. The forging-rolling-multi-pass cold drawing process was used to create the PtIr alloy wire with ϕ1.2 mm, and heat treatment was applied to the intermediate wire. In order to observe the grain size and microstructure characteristics, establish the texture evolution pattern and heat treatment mechanism, and create an suitable two-stage heat treatment process, the prepared alloy wires and the specimens following single-stage heat treatment were characterized using techniques such as optical microscopy, EBSD, etc. To determine the relationship between the heat treatment technique, microstructure, and properties, compare the mechanical characteristics of samples following various two-stage heat treatment procedures. The findings indicate that the heat treatment of Pt-10Ir wire as a process of dislocation recombination (recovery), recrystallisation nucleation and growth, and texture-selective strengthening, which is the outcome of the joint effect of solute drag and recrystallisation kinetics. 850°C-60 min and 950°C-40 min are the optimum two-stage heat treatment process, which increase the ductility sixfold.