Advances in Materials Research, Vol. 1, No. 3 (2012) 169-182 169 The tensile deformation and fracture behavior of a magnesium alloy nanocomposite reinforced with nickel T.S. Srivatsan * 1 , K. Manigandan, C 1 . Godbole 1 , M. Paramsothy 2 and M. Gupta 2 1 Division of Materials Science and Engineering, Department of Mechanical Engineering, The University of Akron, Akron, Ohio 443250-3903, USA 2 Department of Mechanical Engineering, National University of Singapore 9, Engineering Drive 1, Singapore 117-576, Singapore (Received March 24, 2012, Revised May 26, 2012, Accepted July 12, 2012) Abstract. 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.% Al 2 O 3 /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.% Al 2 O 3 ). 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. Keywords: magnesium alloy; reinforcements; aluminum oxide and nickel particles; metal-matrix com- posite; microstructure; microhardness; tensile properties; tensile fracture; mechanisms 1. Introduction The metal magnesium has for long been recognized as a viable engineering alloy for a spectrum of weight-critical applications. In the time period spanning the last three decades, i.e., since the early 1980s, new and improved magnesium alloys that offer a combination of high strength and improved corrosion resistance have been developed and emerged for use in both critical and non-critical end products. Incorporation of hard phases as reinforcements to a magnesium alloy metal matrix does result in improved specific strength (σ /ρ) and specific modulus (E/ρ ) when compared one-on-one to the monolithic counterpart (Koss and Copley 1971, Nair 1985, Chawla 1987, Srivatsan and Sudarshan 1993, Ye and Liu 2004). Consequently, composites based on magnesium alloy metal matrices have gradually grown in stature, strength and significance to successfully compete with the *Corresponding author, Ph.D., E-mail: [email protected] DOI: http://dx.doi.org/10.12989/amr.2012.1.3.169
The tensile deformation and fracture behavior of a magnesium alloy nanocomposite reinforced with nickel
Jun 24, 2023
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