Abstract
Phase transformation and crystal structure variety will influence microstructure evolution and hot deformation behaviour of high niobium containing Ti-Al alloys. These alloys are great attention in research on industrial and medical sectors. The niobium alloys are lightweight and high strength, increasingly popular for automotive engine and chassis components. Three novel Ti-Al based alloys have been developed in present research such as Ti-43Al-6Nb-1Mo-1Cr, Ti-43Al-7Nb-3Mo-2Cr and Ti-43Al-8Nb-3Mo-3Cr niobium alloys were fabricated using a hot isostatic press (HIP). The alloys were heat-treated at 1200 °C temperature for 5 h in the Ar atmosphere. The mechanical properties and flow curves of Ti-Al alloys are studied by varying three different temperatures (800 to 1200 °C) and strain rates (0.1 to 10 s−1) on a servo-controlled universal testing machine. The microstructures of the alloys were analysed using SEM. The results showed an addition of Nb-Mo-Cr particles to Ti-Al increased material strength by 21.36% (Hardness), 32.08% (compressive), 41.37% (splitting tensile) and 39.23% (flexural) more than as-cast alloy. In addition, Nb and Cr with Mo will provide excellent oxidation resistance and mechanical strength for Ti-Al alloys. This study shows a benchmark against compatible alloys and metallic implants. From results, the representation of material is specified as Ti-43Al-8Nb-3Mo-3Cr > Ti-43Al-7Nb-3Mo-2Cr > Ti-43Al-6Nb-1Mo-1Cr.
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