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Author: search.filters.author.Khantachawana, AnakSubject: search.filters.subject.mechanical properties

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    Microstructure and mechanical properties of Ti-Zr alloys fabricated by two-step spark plasma sintering from TiH2 and ZrH2 powders
    (2023-01-01)
    Banjongaxsorn, Kunpot
    ;
    Khantachawana, Anak
    ;
    Watanabe, Chihiro
    ;
    Srirussamee, Kasama
    ;
    Kondoh, Katsuyoshi
    Ti is well-known for its high strength-to-weight ratio and biocompatibility. It can be alloyed with Zr to improve mechanical properties. Currently, Ti-Zr alloys can be fabricated by powder metallurgy using Ti and Zr powders, although high oxidation reactivity and cost could still be an issue. In this study, premixed TiH<inf>2</inf> and ZrH<inf>2</inf> powders were used to prepare Ti-Zr binary alloys with different Zr contents of 0–30 mass% ZrH<inf>2</inf> via dehydrogenation and sintering by spark plasma sintering (SPS) process. α-Ti and δ-TiH<inf>2</inf> phases coexisted in the sintered Ti-Zr alloys, and a characteristic lamellar microstructure was formed. The tensile strength of the Ti-Zr alloys increased with increasing Zr content due to the solid solution effect, grain refinement and the appearance of δ-TiH<inf>2</inf> phases, although the elongation was reduced. This study shows that the fabricated Ti-Zr alloys possess controllable mechanical properties, which can be beneficial for biomedical and other engineering applications.
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    Effect of Nb Content and water quenching on microstructure and mechanical properties of Ti-Nb alloys fabricated by spark plasma sintering
    (2022-01-01)
    Suesawadwanid, Nattawood
    ;
    Khantachawana, Anak
    ;
    Srirussamee, Kasama
    ;
    Kondoh, Katsuyoshi
    Titanium-niobium (Ti-Nb) alloys have been extensively studied for medical implants due to their advantageous mechanical properties and biocompatibility. However, the stress shielding effect remains a challenge. This research investigated the effects of Nb content and enhancement of α′′ formation on the mechanical properties of Ti-xNb alloys (x = 0, 5, 15 and 25%) fabricated by spark plasma sintering. Water quenching from the β phase induced α′′ phase formation in Ti-5Nb and Ti-15Nb samples, thereby reducing their Young’s modulus values but was not observed in commercially pure titanium (CP-Ti) and Ti-25Nb. Results showed that heat treatment with water quenching induced α′′ phase formation and can be used to tailor the properties of Ti-Nb alloys fabricated by SPS. This technique can also be used to enhance material ductility at high β-stabilizer content, as observed in Ti-25Nb samples.