The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform

Ze Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Microstructural evolution of body-Centered Cubic Structure related Ti-Zr-Ni phases in non-stoichiometric Zr-based Zr-Ti-Mn-V-Ni hydride electrode alloys
    Journal of Materials Research, 2003
    Co-Authors: Xueyan Song, Yun Chen, César A.c. Sequeira, Y.q. Lei, Qidong Wang, Ze Zhang
    Abstract:

    Non-stoichiometric Zr-based alloys were prepared, and the corresponding electrochemical properties were characterized as hydride electrode alloys. The microStructure and chemical composition of non-stoichiometric Zr-Ti-Mn-V-Ni hydride electrode alloys were systematically investigated by x-ray Rietveld refinement, transmission electron microscopy. (TEM), and energy dispersive spectroscopy under TEM observation. C14, C15 Laves phases and non-Laves phases were identified in Zr1-xTix(MnVNi)(2.2)(x=0, 0.2, 0.3, 0.4) alloys. Non-Laves phases in Zr1-xTix(MnVNi)(2.2)(x=0, 0.2, 0.3, 0.4) alloys are Ti-Zr-Ni phases related to the TiNi phase with pseudo-body-Centered-Cubic Structure of the CsCl type. The evolution of crystallography and phase constitution for Ti-Zr-Ni non-Laves phases with different alloy composition was systematically studied. The influence of the Ti-Zr-Ni phases on the electrochemical properties of non-stoichiometric Zr1-xTix(MnVNi)(2.2) alloys is briefly discussed.

W S W Harun - One of the best experts on this subject based on the ideXlab platform.

  • finite element study of functionally graded porous femoral stems incorporating body Centered Cubic Structure
    Artificial Organs, 2019
    Co-Authors: Sami E Alkhatib, Faris Tarlochan, Hassan Mehboob, Ramesh Singh, K Kadirgama, W S W Harun
    Abstract:

    The mismatch between stiffness of the femoral dense stem and host bone causes complications to patients, such as aseptic loosening and bone resorption. Three-dimensional finite-element models of homogeneous porous (HGP) and functionally graded porous (FGP) stems incorporating body-Centered Cubic (BCC) Structures are proposed in this article as an alternative to the dense stems. The relationship between the porosity and strut thickness of the BCC Structure was developed to construct the finite-element models. Three levels of porosities (20%, 50%, and 80%) were modeled in HGP and FGP stems. The porosity of the stems was decreased distally according to the sigmoid function (n = 0.1, n = 1 and n = 10) with 3 grading exponents. The results showed that FGP stems transferred 120%-170% higher stresses to the femur (Gruen zone 7) as compared to the solid stem. Conversely, the stresses in HGP and FGP stems were 12%-34% lower than the dense stem. The highest micromotions (105-147 µm) were observed for stems of 80% overall porosity, and the lowest (42-46 µm) was for stems of 20% overall porosity. Finally, FGP stems with a grading exponent of n = 10 resulted in an 11%-28% reduction in micromotions.

J. Polák - One of the best experts on this subject based on the ideXlab platform.

  • Fatigue of Steels
    Reference Module in Materials Science and Materials Engineering, 2016
    Co-Authors: J. Polák
    Abstract:

    Steels represent important type of structural materials which are subject in service to cyclic loading under different environmental conditions. Fatigue damage develops and can result in initiation of a crack, its growth, and sudden fracture. Basic characteristics of steels allowing to characterize their resistance to cyclic loading are presented. Behavior of individual types of steels sorted according the type of their Structure is reviewed. Detailed information on the cyclic plastic stress–strain response, on fatigue crack initiation and growth of short and long cracks is presented for austenitic stainless steels with face-Centered Cubic Structure, iron and steels with body-Centered Cubic Structure, and for mutliphase and high-strength steels. An emphasis is put on the mechanisms, i.e., mechanisms of cyclic plastic straining, the mechanisms of the of the initiation and crack growth. Relevant parameters characterizing the resistance of steels to cyclic loading are presented.

Xueyan Song - One of the best experts on this subject based on the ideXlab platform.

  • Microstructural evolution of body-Centered Cubic Structure related Ti-Zr-Ni phases in non-stoichiometric Zr-based Zr-Ti-Mn-V-Ni hydride electrode alloys
    Journal of Materials Research, 2003
    Co-Authors: Xueyan Song, Yun Chen, César A.c. Sequeira, Y.q. Lei, Qidong Wang, Ze Zhang
    Abstract:

    Non-stoichiometric Zr-based alloys were prepared, and the corresponding electrochemical properties were characterized as hydride electrode alloys. The microStructure and chemical composition of non-stoichiometric Zr-Ti-Mn-V-Ni hydride electrode alloys were systematically investigated by x-ray Rietveld refinement, transmission electron microscopy. (TEM), and energy dispersive spectroscopy under TEM observation. C14, C15 Laves phases and non-Laves phases were identified in Zr1-xTix(MnVNi)(2.2)(x=0, 0.2, 0.3, 0.4) alloys. Non-Laves phases in Zr1-xTix(MnVNi)(2.2)(x=0, 0.2, 0.3, 0.4) alloys are Ti-Zr-Ni phases related to the TiNi phase with pseudo-body-Centered-Cubic Structure of the CsCl type. The evolution of crystallography and phase constitution for Ti-Zr-Ni non-Laves phases with different alloy composition was systematically studied. The influence of the Ti-Zr-Ni phases on the electrochemical properties of non-stoichiometric Zr1-xTix(MnVNi)(2.2) alloys is briefly discussed.

G Langouche - One of the best experts on this subject based on the ideXlab platform.