Correlation Between The Microstructure And Mechanical Properties Of W-Bearing Ti-6al-4v Alloys

W-containing Ti-6Al-4V alloys (W=0, 1, and 5 wt%) were fabricated by the powder injection molding process, and the corresponding effects of tungsten content on the mechanical properties and microstructure of the alloys were investigated. The alloy powders were sintered at 1200 degrees C and then hot-isostatically-pressed at 900 degrees C. The fabricated alloys were subjected to microstructural and chemical analyses, and tensile and nano-indentation tests. The yield strength and tensile strength proportionally increased as the W content was increased from 0 wt% to 5 wt%. Ductility was not affected by the addition of up to 5 wt% W due to its complete dissolution in the matrix. Higher W addition induced finer alpha/beta lamellar microstructures and increased the beta to a phase ratio. Moreover, the added W dissolved preferentially in the beta phase by solid solution hardening, increasing the hardness of the beta phase, which originally was significantly softer than the a phase. For the alloys containing up to 5 wt% W, the strengthening without ductility loss was attributed to the finer alpha/beta lamellae and the volume increase in the beta phase hardened by W. These results suggest that adding W to Ti-6Al-4V alloy is a promising method for developing Ti alloys with both high strength and toughness.