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Titanium aluminides based on 481 with Cr and Nb additions has been made through reaction synthesis (RS) process. Development of various phases in RS and after homogenization has been studied through X-ray diffraction (XRD), optical microscopy (OM) and Transmission Electron Microscopy (TEM). Uniform distribution of elements was confirmed through elemental mapping, ED AX and hardness measurements. It is observed that, mainly Al 3 Ti phase forms during reaction synthesis and TiAl () and Ti 3 Al (oc 2 ) phases form after homogenization. Density of the product was measured and found to be nearly equal to theoretical density of the alloy. Improvement in hardness is observed after homogenization, which is found to be due to formation of . phases. A high temperature oxidation study of the ternary and quaternary alloy was carried out and it was noted that oxidation resistance of quaternary alloy is better than ternary alloy (with Cr). Processing aspects and properties of present alloys is compared with RS processed binary Ti alumnide.
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Gupta et al. (2009) studied this question.
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