[SIS5] MIM Challenges for New Materials

[15D-SIS5-03] The Influence of Mo Additions on Physical, Microstructure and Mechanical Properties in Commercially Pure Ti Manufactured by MIM Process

*M. Tange^{1, 2}, C. Suwanpreecha^{3, 4}, S. Songkuea^{3, 4}, A. Manonukul^{3, 4}, S. Tanaka² (1.Taisei Kogyo (Thailand) Co., Ltd., Thailand, 2.Micro MIM Japan Holdings Inc., Japan, 3.National Metal and Materials Technology Center, Thailand, 4.National Sciences and Technology Development Agency, Thailand)

Keywords:CP-Ti, Mo, Sintering, Mechanical properties

Molybdenum (Mo) is one of the beta phase stabilisers in titanium, garnering significant interest for modifying Ti alloys in biomedical applications. Being a non-toxic alloying element with reasonable cost, Mo can enhance mechanical properties through solution strengthening. In this study, five levels of Mo content (0, 5, 7.5, 10, 15 wt.%) were added to CP-Ti powder, manufactured by the metal injection moulding (MIM) process. Three sintering temperatures were applied. The properties of the sintered specimens were evaluated through density, impurity contents, microstructure, tensile testing, and observation of the fracture surface. The results indicate that higher Mo contents lead to a higher beta phase and tensile strength. However, excessively high Mo content contributes to low ductility due to TiC precipitation at the grain boundary. In this study, 5 wt.% Mo addition specimen shows the best properties.