Preparation of Ti ternary alloys by addition of Si to Ti-Mo alloy scraps for carbonitride application

In this study, Ti-Mo-Si ternary alloy ingots were prepared by the addition of Si (0.252.0 mass%) to Ti-10Mo alloy scraps in order to produce the raw materials for titanium carbonitride composites. To investigate the effects of Si addition, the prepared alloys were subjected to hardness, tensile strength, grain size, and phase analyses. The Si-added alloys showed no major changes in their O, N, and C impurity contents. Their hardness increased remarkably in proportion to an increase in the Si content, from 435Hv to 601 Hv at 2.0 mass%. The tensile strength increased with Si addition up to a maximum of 1.0 mass%, reaching 883 MPa, but after this peak, it decreased sharply because of the brittleness that arose by the formation of titanium silicide.