• Title/Summary/Keyword: Microstructure and mechanical properties

Search Result 2,021, Processing Time 0.029 seconds

Effects of Thermomechanical Processing on Changes of Microstructure and Mechanical Properties in Ti-10Ta-10Nb Alloy (가공 열처리에 따른 Ti-10Ta-10Nb합금의 미세조직 및 기계적 특성 변화)

  • Lee, Doh-Jae;Hwang, Ju-Young;Lee, Kyung-Ku;Yoon, Kye-Lim;Jun, Choong-Geug
    • Journal of the Korean Society for Heat Treatment
    • /
    • v.18 no.2
    • /
    • pp.91-98
    • /
    • 2005

  • Both commercially pure titanium and Ti-6Al-4V alloy have been widely used as biomaterials because of their excellent biocompatibility, corrosion resistance and mechanical properties. However, in recent years, vanadium has been found to cause cytotoxic effects and adverse tissue reactions, while aluminium has been associated with potential neurological disorders. A newly designed ${\alpha}+{\beta}$ type Ti alloy, Ti-10Ta-10Nb alloy showed superior properties to CP Ti and Ti-6Al-4V alloy in the point of biomaterial, and elucidated the future uses as a biomaterial. Microstructural changes of Ti-10Ta-10Nb alloy after hot-rolling, warm-rolling, solution and aging treatment were investigated. According to TEM results, the microstructures after solution treatment were composed of mostly ${\alpha}$ phase with a trace of ${\beta}$ phase due to adding ${\beta}$-phase stabilizer tantalum and niobium. The microstructures after warm-rolling is coarse and elongated ${\alpha}$ phase and hot rolling resulted in very fine ${\alpha}$ widmanst$\ddot{a}$tten. The highest value of hardness was obtained by aging treatment at $400^{\circ}C$ for 20hr in which microstructure consisted of very fine ${\alpha}$ phase in ${\beta}$ matrix.

  • PDF KSCI

The Evaluation of Mechanical Property of WC-8%Co Alloys by Coercive Force and Magnetic Saturation (항자력과 자기포화도에 의한 WC-8%Co 초경합금의 기계적 성질 평가)

  • Ahn, Dong-Gil
    • Journal of the Korean Society for Nondestructive Testing
    • /
    • v.20 no.5
    • /
    • pp.438-444
    • /
    • 2000

  • The prediction of mechanical properties for WC-Co alloys by evaluation of coercive force and magnetic saturation were studied in relation to their microstructure. The WC-8%Co alloys were prepared using different WC particle size, carbon content and various sintering temperature by PM process. The magnetic properties such as coercive force and magnetic saturation of sintered WC-Co alloys were critically dependent upon their final composition and microstructure. Slight changes of carbon contents and small variation of WC grain size result in marked changes of magnetic properties, hardness and transverse rupture strength of sintered WC-Co alloys. It was found that the coercive force and hardness were increased by fine WC grain size of sinterd alloys, and the coercive force was proportional to hardness. With decreasing total carbon content below the stoichiometric value in WC-8%Co alloys the volume fraction of $\eta$ phase increased steadily, while the magnetic saturation and transverse rupture strength decreased. The magnetic saturation was inversely proportional to the coercive force of WC-Co alloys.

  • PDF