Abstract：The tungsten alloy 86W-12.5Ni-1.2Al-5.5Fe-1.5Al2O3 for truck crankshaft was treated by spark plasma sintering (SPS) technology. The effect of cycle times on its structure and properties was studied. The results show that when the number of SPS cycles increases, more uniform W grains and binding phase (m) are formed in the sample, and the w-w connectivity decreases. Most of Al2O3 particles are concentrated in the W-M interface area, and the proportion of W element in the binding phase decreases. The results show that the solution strengthening effect of tungsten alloy can be achieved by SPS cycling treatment, and the higher mechanical strength of tungsten alloy can be obtained by reducing w-w connectivity. After more SPS cycles, the bending strength and fracture deflection of the tungsten alloy were improved significantly, and reached the maximum at 18 SPS cycles. After several SPS cycles, more dislocations were formed in the bonding phase, which greatly enhanced the strength of the alloy.
2020, Vol. 30 
