Abstract
The effects of boron(B) on the microstructure and mechanical properties of Zr3Al-based alloys were investigated. Zr-6Al-XB alloys (X=0, 0.02, 0.05, 0.1, 0.15wt%) were first smelted in a non-consumable electric arc furnace. The ingots were then hot rolled four passes at 950°C and annealed at 800°C for 4h to obtain Zr3Al-based alloys. Analysis results showed that B can dramatically refine the grains of Zr3Al-based alloys: doping 0.1wt% B could reduce the grain size of Zr3Al-based alloy from 500μm to 30μm; grain size decreases with the amount of B doped in the alloy until a certain threshold amount is reached, and then excessive amount of B (0.15wt% B doped Zr3Al-based alloy) leads to larger grain size. Tensile strength and elongation of B doped Zr3Al-based alloys were also improved with higher level of grain refinement. Annealing changed the fracture mode of all samples from brittle to ductile and B doped can further enhance ductility.
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