Heat-only method refines alloy grains for fusion reactors and jet engines

Researchers at the University of Birmingham developed Precipitation Induced Recrystallisation (PIX), which uses heat treatment alone to create internal strain and refine grains. A tungsten-chromium alloy aged at 1,250°C saw grain size drop about 60%, while a titanium-iron-molybdenum alloy at 750°C dropped roughly 90% and gained 60 Vickers of hardness.

• PIX replaces rolling and forging with heat: nanoscale precipitates generate elastic strain that drives recrystallization
• Tungsten-chromium alloy at 1,250°C: average grain size cut by around 60%
• Titanium-iron-molybdenum alloy at 750°C: grain size down 90%, hardness up 60 Vickers units
• Method helps process 3D-printed parts with coarse grains that cannot be hammered or rolled