Preparation, microstructure, and constitutive equation of W-0.25 wt% Al2O3 alloy

Al2O3-dispersion-strengthened tungsten matrix alloys were fabricated by hydrothermal synthesis and powder metallurgy. The v content was varied from 0 to 1 wt%, and sintering was conducted for 8 h at 2350 degrees C. The addition of Al2O3 was found to significantly affect the grain size and compressive strength of the sintered alloys. The grain size of the sintered samples ranged from approximately 10 to 3 um with increasing Al2O3 content. When the Al2O3 content was increased to 0.25 wt%, the microhardness and compressive strength reached the maximum values of 386 HV and 1628 MPa, respectively. Subsequently, the deformation behavior of the W-0.25 wt% Al2O3 alloy at high temperature was studied. The constitutive equation relating the flow stress and deformation parameters of the W-0.25 wt% Al2O3 alloy was established, and the hot deformation activation energy (Q) of the W-0.25 wt% Al2O3 alloy was found to be 321.79 kJ/mol.