Abstract
The effect of molybdenum additions on the phases, microstructures, and mechanical properties of pre-alloyed Ti6Al4V was studied through the spark plasma sintering technique. Ti6Al4V-xMo (where x = 0, 2, 4, 6 wt.% of Mo) alloys were developed, and the sintered compacts were characterized in terms of their phase composition, microstructure, and mechanical properties. The results show that the equiaxed primary alpha and Widmänstatten (alpha + beta) microstructure in pre-alloyed Ti6Al4V is transformed into a duplex and globular model with the increasing content of Mo from 0 to 6%. The changing pattern of the microstructure of the sample strongly influences the properties of the material. The solid solution hardening element such as Mo enhances mechanical properties such as yield strength, ultimate tensile strength, ductility, and hardness compared with the pre-alloyed Ti6Al4V alloy.
Highlights
The reason is that the molybdenum has a higher density (10.28 g/cm3 ) than the pre-alloyed
Incomplete diffusion develops the pores in the sample, reducing the sintered density
The powder morphologies were investigated by scanning electron microscopy (SEM), which shows that the spherical powder particles of pre-alloyed Ti6Al4V powders are uniformly distributed, the majority of the molybdenum powder particle sizes are less than 74 μm (95%), and a small number of particle sizes are in the range of 74–149 μm (5%)
Summary
Titanium and its alloys exhibit excellent mechanical properties such as high strength and stiffness, high plasticity, and light weight, with outstanding corrosion resistance [1,2,3,4,5]. They (especially Ti6Al4V) are finding increased applications in automobile engines, biomedical devices, airplanes, rockets and missile components, and marine fields [6,7,8,9,10].
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