Ti-5.5Al-2Fe alloy has been theoretically designed by modification of Ti-6Al-4V alloy, using ubiquitously alloying elements in order to establish the strategic method for suppressing utilization of rare metals. The utilization of the cold crucible levitation melting (CCLM) is very useful, because titanium is very chemically reactive at high temperature. The experimental alloys with high purity and without contaminations from a crucible were prepared, and the homogeneous melt was also achieved by the diffusion mixing effect of CCLM. The microstructure, phase stability, strength, corrosion-resistance and workable properties of the designed alloy, were comparable to those of Ti-6Al-4V. The alloy design can be successfully carried out even using ubiquitously alloying elements by the d-electrons concept, which leads to the establishment of one method for the strategic utilization of rare metals.
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Matsugi et al. (2008) studied this question.
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