Study on Annealing Behaviors of Ta-2.5wt%W Alloy Foil with Different Thickness

The mechanical properties and microstructures of Ta-2.5wt%W alloy under different conditions are studied by micro-hardness test,TEM and metallographic observation.The results show that the hardness of cold-rolled Ta-2.5wt%W alloy reaches to 240.During the annealing,the hardness of Ta-2.5wt%W alloy with same thickness gradually falls with the increase of annealing temperature.The recrystallization of Ta-2.5wt%W alloy with 0.068 mm thickness occurs at 1200 ℃,while its complete recrystallization occurs at 1360 ℃,with coarse grains.The initial recrystallization temperature of Ta-2.5wt%W alloys with different thickness falls with the samples′ becoming thinner in the process of annealing.When Ta-2.5wt%W alloys with different thickness are annealed at the same temperature,the recovery degree of recrystallization increases with the samples′ becoming thinner as well.