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    High-Temperature Deformation and Subsequent Static Recrystallization Behavior of Ultra-Low Stacking-Fault Energy Cu-Zn-Si Alloys
    (2026-01-01)
    Miura, Hiromi
    ;
    Kasuya, Sanshiro
    ;
    Oba, Yojiro
    ;
    Okada, Takuya
    ;
    Watanabe, Chihiro
    Behaviors of high-temperature deformation followed by annealing and static recrystallization (SRX) in Cu-Zn-Si alloys with ultra-low stacking-fault energy (SFE) were investigated. The peak stress, steady-state flow stress and grain size during high-temperature deformation appeared to decrease with decreasing SFE, which would suggest easier occurrence of dynamic recrystallization (DRX) with decreasing SFE. Nevertheless, with increasing initial grain size, onset of DRX was much delayed even at higher temperatures and lower strain rates. SRX started after annealing for rather long periods of time contrary to the expectation that SRX should be stimulated because of meta-DRX. New grains evolved by DRX and SRX contained quite high density of annealing twins, showing DRX and SRX mechanisms induced by annealing twin formation during grain-boundary migration. [doi:10.2320/matertrans.MT-D2025015]
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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.