Abstract
This research fabricates Ni-35Cr-12Mo-3Nb alloys using the vacuum hot pressing process of PM technology. The experiments used various hot pressing temperatures (1050, 1100, 1150, and 1200 °C) and hot pressing pressures (20, 35, and 50 MPa) to determine the optimal process parameters. The experimental results show that the optimal hot pressing parameters for this alloy were 1100 °C at 35 MPa for 1 h. Among them, the sintered density was enhanced to 8.15 ± 0.01 g cm−3, and the hardness, transverse rupture strength (TRS) and flexural modulus reached 78.0 ± 0.1 HRA, 1404.2 ± 36.8 MPa, and 75.4 ± 3.3 GPa, respectively, and the electrical conductivity was 1.92 ± 0.14 × 104 S cm−1. TEM observation proves that the MoNi and Ni3Nb intermetallic compounds do indeed exist in the Ni-35Cr-12Mo-3Nb alloy after 1100 °C hot pressing at 35 MPa for 1 h. MoNi is an orthorhombic system with diffraction along the [3 4‾ 4] crystal axis, and Ni3Nb is the same system, but along the [100] crystal axis. EBSD analysis results also confirm that this alloy has no obvious grain orientation preference.
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