Abstract
High production costs of Ti alloys usually hinders their use in industry sectors like the automotive and hence, low-cost titanium alloys could broaden titanium alloy usage. This work presents the study of three alloys— Ti-Fe, Ti-Fe-Al, and Ti-Fe-Cr—produced by powder metallurgy methods. The design of the compositions was aimed at reducing cost and enhance the oxidation and corrosion resistance while not decreasing the mechanical performance. The use of titanium hydride as raw material instead of Ti powder is highlighted as a key feature in the design and manufacturing procedure of the alloys. Introducing a dehydrogenation process during sintering favors the densification process while reducing the oxygen contamination and the production cost. There is a lack of studies focused on the implementation of affordable PM Ti alloys in high demanding environments. Therefore, a study of high temperature oxidation resistance and electrochemical behavior was performed.
Highlights
Titanium and its alloys are widely used in aeronautical, military, and biomedical sectors for their combination of corrosion resistance in aggressive environments, high specific strength, and biocompatibility
There is a lack of studies focused on the implementation of affordable powder metallurgy (PM) Ti alloys in high demanding environments
In order to preserve the performance of commercial alloys while reducing the production cost, it has been reported that Al and Cr may produce an enhancement in corrosion and oxidation resistance [8,9,10,11,12]
Summary
Titanium and its alloys are widely used in aeronautical, military, and biomedical sectors for their combination of corrosion resistance in aggressive environments, high specific strength, and biocompatibility. The main handicap that holds back steel and aluminum replacement by titanium alloys in most large-scale applications is the high production cost and metalworking of the final product [1]. Considering that Fe is one of the most effective β-phase stabilizer while still being a low-cost alloying element [5,6], it stands out as potential replacement for high cost vanadium that could deliver the high demanding properties that aeronautical, biomedical, and transport applications [5,6,7] require from commercial Ti alloys. Oxidation and corrosion behavior studies of PM Ti alloys are uncommon and the introduction of sintering enhancement elements like iron has been focused on mechanical properties [6,13], with a lack of appropriate studies to evaluate the corrosion and oxidation resistance of Ti-Fe alloys [14,15]
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