• strength enhancement of a biomedical titanium alloy through a modified accumulative roll bonding technique

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1394/01/01
    • تاریخ انتشار در تی پی بین: 1394/01/01
    • تعداد بازدید: 694
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the strength of a biomedical β-type alloy, ti–25nb–3zr–3mo–2sn, was enhanced through severe plastic deformation using a modified accumulative roll bonding technique. incremental strength increases were observed after each cycle, while ductility initially fell but showed some recovery with further cycles. after 4 cycles there was a 70% improvement in the ultimate tensile strength to 1220 mpa, a two-fold increase in the 0.5% proof stress to 946 mpa and the ductility was 4.5%. the microstructure comprised of ultrafine grain β grains heavily elongated in the rolling direction with a fine dispersion of nanocrystalline α phase precipitates on the β grain boundaries. shear bands formed in order to accommodate large plastic strains during processing and the grains within the bands were significantly finer than the surrounding matrix.

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