Effects of y₂o₃ on the microstructure and mechanical properties of tungsten alloys

Mass fraction of Y₂O₃ effects on the microstructure and mechanical properties of tungsten alloys with 0-2.0% Y₂O₃ were studied. The results showed that the average size of tungsten grain decreases from 30.5 μm to 15.0 μm as the content of Y₂O₃ increased. The grain morphology changed from quasi-sphere to irregular polyhedron. The proportion of W-W and W-M interface detaching on the fracture surface increases as the addition of Y₂O₃, resulting in the decrease of static tensile strength and elongation. The dynamic compressive strength of tungsten alloys enhances and then reduces as the content of Y₂O₃ increased. It enhances when the content of Y₂O₃ remains under 1.0%, however, when the content of Y₂O₃ goes over 1.5%, it decreases.