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Influence of Nickel Particle Reinforcement on Cyclic Fatigue and Final Fracture Behavior of a Magnesium Alloy Composite
Division of Materials Science and Engineering, Department of Mechanical Engineering, The University of Akron, Akron, OH 44309, USA
Department of Mechanical Engineering, National University of Singapore, Singapore 117-576, Singapore
* Author to whom correspondence should be addressed.
Received: 12 April 2012; in revised form: 25 May 2012 / Accepted: 29 May 2012 / Published: 7 June 2012
Abstract: The microstructure, tensile properties, cyclic stress amplitude fatigue response and final fracture behavior of a magnesium alloy, denoted as AZ31, discontinuously reinforced with nano-particulates of aluminum oxide and micron size nickel particles is presented and discussed. The tensile properties, high cycle fatigue and final fracture behavior of the discontinuously reinforced magnesium alloy are compared with the unreinforced counterpart (AZ31). The elastic modulus and yield strength of the dual particle reinforced magnesium alloy is marginally higher than of the unreinforced counterpart. However, the tensile strength of the composite is lower than the monolithic counterpart. The ductility quantified by elongation to failure over 0.5 inch (12.7 mm) gage length of the test specimen showed minimal difference while the reduction in specimen cross-section area of the composite is higher than that of the monolithic counterpart. At the microscopic level, cyclic fatigue fractures of both the composite and the monolithic alloy clearly revealed features indicative of the occurrence of locally ductile and brittle mechanisms. Over the range of maximum stress and at two different load ratios the cyclic fatigue resistance of the magnesium alloy composite is superior to the monolithic counterpart. The mechanisms responsible for improved cyclic fatigue life and resultant fracture behavior of the composite microstructure are highlighted.
Keywords: magnesium alloy; particulate reinforcements; aluminum oxide; nano-size; cyclic fatigue; fracture
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Srivatsan, T.S.; Manigandan, K.; Godbole, C.; Paramsothy, M.; Gupta, M. Influence of Nickel Particle Reinforcement on Cyclic Fatigue and Final Fracture Behavior of a Magnesium Alloy Composite. Metals 2012, 2, 143-169.
Srivatsan TS, Manigandan K, Godbole C, Paramsothy M, Gupta M. Influence of Nickel Particle Reinforcement on Cyclic Fatigue and Final Fracture Behavior of a Magnesium Alloy Composite. Metals. 2012; 2(2):143-169.
Srivatsan, Tirumalai S.; Manigandan, K.; Godbole, Chinmay; Paramsothy, Muralidharan; Gupta, Manoj. 2012. "Influence of Nickel Particle Reinforcement on Cyclic Fatigue and Final Fracture Behavior of a Magnesium Alloy Composite." Metals 2, no. 2: 143-169.