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Advances in Materials Research
  Volume 1, Number 3, September 2012 , pages 169-182

The tensile deformation and fracture behavior of a magnesium alloy nanocomposite reinforced with nickel
T.S. Srivatsan, K. Manigandan, C. Godbole, M. Paramsothy and M. Gupta

    In this paper the intrinsic influence of micron-sized nickel particle reinforcements on microstructure, micro-hardness tensile properties and tensile fracture behavior of nano-alumina particle reinforced magnesium alloy AZ31 composite is presented and discussed. The unreinforced magnesium alloy (AZ31) and the reinforced nanocomposite counterpart (AZ31/1.5 vol.% Al2O3/1.5 vol.% Ni] were manufactured by solidification processing followed by hot extrusion. The elastic modulus and yield strength of the nickel particle-reinforced magnesium alloy nano-composite was higher than both the unreinforced magnesium alloy and the unreinforced magnesium alloy nanocomposite (AZ31/1.5 vol.% Al2O3). The ultimate tensile strength of the nickel particle reinforced composite was noticeably lower than both the unreinforced nano-composite and the monolithic alloy (AZ31). The ductility, quantified by elongation-to-failure, of the reinforced nanocomposite was noticeably higher than both the unreinforced nano-composite and the monolithic alloy. Tensile fracture behavior of this novel material was essentially normal to the far-field stress axis and revealed microscopic features reminiscent of the occurrence of locally ductile failure mechanisms at the fine microscopic level.
Key Words
    magnesium alloy; reinforcements; aluminum oxide and nickel particles; metal-matrix composite; microstructure; microhardness; tensile properties; tensile fracture; mechanisms
T.S. Srivatsan, K. Manigandan and C. Godbole: Division of Materials Science and Engineering, Department of Mechanical Engineering, The University of Akron, Akron, Ohio 443250-3903, USA; M. Paramsothy and M. Gupta: Department of Mechanical Engineering, National University of Singapore 9, Engineering Drive 1, Singapore 117-576, Singapore

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