Investigation on the Microstructure and Compressive Properties of W-15Mo Alloy Fabricated via Laser Powder Bed Fusion

Solid solution with molybdenum is an effective strategy for improving the overall performance of tungsten alloys, thereby enhancing their application potential in aerospace and other fields. In this study, highly dense W-Mo alloy specimens were successfully fabricated using laser powder bed fusion, followed by stress-relief annealing. The results show that the complete solid solution of molybdenum yields a fine columnar grain structure with weak texture. After stress-relief annealing, the residual stress decreases, the grain size increases slightly, and the fraction of the <111>//building direction (BD) texture rises. Ultimately, W-Mo alloy specimens with excellent compressive properties are obtained, with compressive yield strength, ultimate compressive strength, and compressive strain reaching 879.5 MPa, 1257.3 MPa, and 16.6%, respectively. This work provides new insights into the fabrication of refractory alloys by laser powder bed fusion.