Development of a new PM titanium alloy for improved processability

Abstract

The application of titanium and its alloys are fast expanding from large sized aerospace components to small components such as hand phone covers. They are restricted by the processability and the economics of use of titanium despite the advantages that could be realised. The present work attempts to reduce the processing temperature of Ti by suitable alloying additions. Mixing of the powders was performed in a tumbler mixer with a charge to ball ratio of 1 : 2 for different time durations. The powder mix was then compacted at a pressure of 1050 MPa and was sintered in argon. The effect of alloying additions was studied with respect the properties achievable. The elevated temperature properties of the alloy so developed were also studied. The alloy developed has a hardness ranging from 335 to 370 HV. The tensile strengths obtainable varied from 550 to 800 MPa. Upsetting tests at room and elevated temperature conditions indicated that a maximum strain of close to 30% was achievable at temperatures of 200°C. This facilitates warm forging of the alloy and therefore would cut on the heavy processing costs of Ti alloys.