Microstructural and mechanical properties of Ti-Mo-W alloy by mechanical alloying and conventional sintering

Abstract

The present work deals with the fabrication of Ti (Titanium) based alloys with a composition of Ti80Mo10W10 (alloy A) and Ti90Mo5W5 (alloy B) (all in wt %) through mechanical alloying for 20 h. The 20 h milled powder is compacted into cylindrical pallets under a compaction pressure of 5-ton with a dwell time 3 min followed by conventional sintering at 1000 °C for 1 h under continuous Argon flow (100 ml/min). The X-ray diffraction (XRD) and scanning electron microscopy (SEM) has been used for assessment of phases and microstructure of powders and the sintered samples. The minimum particle size of 481.6 nm was observed in alloy B measured using Malvern nano zeta meter at 20 h milled powder. Maximum micro-hardness of 7.09 GPa found in alloy B measured using Vickers hardness tester at 100 gf load with 10 sec dwell time. Maximum sintered density of 85% measured using Archimedes’ principle found in alloy B. Minimum wear depth of 26.01 µm has been observed in alloy B owning to its higher hardness and sinterability at 20 N force for 20 min.