Microstructure of wrought, laser and electron beam processed NARloy-Z (Cu-3wt% Ag-0.5wt% Zr) was investigated for thermal stability at elevated temperatures 539-760°C (1100 to 1400°F) up to 94 h. Optical and scanning electron microscopy and electron probe microanalysis were employed for studying microstructural evolution and kinetics of precipitation. Grain boundary precipitation and precipitate free zones (PFZs) were observed in the wrought alloy after exposing to temperatures above 605°C (1120°F). Fine-grained microstructure observed in the laser and electron beam (EB) processed NARloy-Z was much more stable at elevated temperatures. Tensile properties of laser and EB glazed NARloy-Z can be tailored by giving suitable heat treatments and maintaining the same strength with increased ductility. Microstructural changes correlated well with hardness measurements and mechanical properties.
All Science Journal Classification (ASJC) codes
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering