Microstructure and Mechanical Behavior of Magnesium Alloy AZ91 Hybrid Composites

International Conference on Advances in Materials and Manufacturing Applications 2017

Sarapure, Sadanand^1 ; Satish, B.M.^2 ; Girish, B.M.^3 ; Basawaraj^4

Department of Mechanical Engineering, School of Engineering, Presidency University, Bangalore, Karnataka

560089, India^1

Department of Mechanical Engineering, East Point College of Engineering and Technology, Bangalore, Karnataka

560049, India^2

Department of Mechanical Engineering, Alliance College of Engineering and Design, Alliance University, Bangalore, Karnataka

562106, India^3

Department of Aerospace Propulsion Technology, Center for Post-graduation Studies, Bangalore Region, Visvesvaraya Technological University, Muddenahalli, Karnataka

562101, India^4

关键词: Average particle size;    AZ91 magnesium alloys;    Heat treated condition;    Magnesium alloy AZ91;    Percentage of reinforcements;    Reinforcement particles;    Tensile fracture surfaces;    Ultimate tensile strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/310/1/012161/pdf
DOI  :  10.1088/1757-899X/310/1/012161

来源: IOP

【 摘 要 】

AZ91 magnesium alloy hybrid composites reinforced with various ratios of SiC and graphite particles were synthesized by stir casting. The composites were prepared by varying the weight percentage of SiC and graphite particles each from 0 to 3 in steps of 1 weight percent. The average particle size of both the reinforcement particles was 27μm. The effect of reinforcement is discussed for both heat treated and non-heat treated composites and compared with unreinforced base alloy. The microstructure reveals that there is a nearly uniform dispersion of particles is the matrix. The density, hardness and ultimate tensile strength of the composite specimen increased as the percentage of reinforcement was increased both in heat treated and non-heat treated conditions. The percentage of elongation decreases as the reinforcement in the composites increased. SEM micrographs of the tensile fracture surfaces showed broken reinforcement particles on the fracture surface and evidence of 'pull outs', where graphite/SiC particles were previously embedded in the matrix.