Abstract
In this paper, we report the fabrication of 90W–7Ni–3Fe refractory alloy using a novel oscillating pressure sintering (OPS) technique. The technique is similar to conventional hot pressing (HP), excepting that an oscillating pressure replaces the static pressure in HP. The results show that compared to HP, OPS can significantly improve the sintering ability of the alloy by decreasing the sintering temperature required for the densification of the alloy and inhibiting grain growth. The sample obtained at 1250 °C exhibits an HV hardness of 450 HV0.5, which is not only much higher than that for the HP prepared sample, but also much higher than materials with similar compositions ever reported. The results clearly demonstrate that OPS is a very promising technique for the fabrication of high performance refractory alloys.
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