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آکتا بیومتریال
جزئیات رویداد
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همایش ، رویداد ، ژورنال
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  • effects of chromium and nitrogen content on the microstructures and mechanical properties of as-cast co–cr–mo alloys for dental applications

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 712
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    • شماره تماس دبیرخانه رویداد: -
     the microstructure and mechanical properties of as-cast co–(20–33)cr–5mo–n alloys were investigated to develop ductile co–cr–mo alloys without ni addition for dental applications that satisfy the requirements of the type 5 criteria in iso 22674. the effects of the cr and n contents on the microstructure and mechanical properties are discussed. the microstructures were evaluated using scanning electron microscopy with energy-dispersive x-ray spectroscopy (eds), x-ray diffractometry (xrd), and electron back-scattered diffraction pattern analysis. the mechanical properties were evaluated using tensile testing. the proof strength and elongation of n-containing 33cr satisfied the type 5 criteria in iso 22674. ε-phase with striations was formed in the n-free (20–29)cr alloys, while there was slight formation of ε-phase in the n-containing (20–29)cr alloys, which disappeared in n-containing 33cr. the lattice parameter of the γ-phase increased with increasing cr content (i.e. n content) in the n-containing alloys, although the lattice parameter remained almost the same in the n-free alloys because of the small atomic radius difference between co and cr. compositional analyses by eds and xrd revealed that in the n-containing alloys cr and mo were concentrated in the cell boundary, which became enriched in n, stabilizing the γ-phase. the mechanical properties of the n-free alloys were independent of the cr content and showed low strength and limited elongation. strain-induced martensite was formed in all the n-free alloys after tensile testing. on the other hand, the proof strength, ultimate tensile strength, and elongation of the n-containing alloys increased with increasing cr content (i.e. n content). since formation of ε-phase after tensile testing was confirmed in the n-containing alloys the deformation mechanism may change from strain-induced martensite transformation to another form, such as twinning or dislocation slip, as the n content increases. thus the n-containing 33cr alloy with large elongation is promising for use in dentures with adjustable clasps through one piece casting.

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