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Research Papers

Effect of Addition of Nano-Al2O3 and Copper Particulates and Heat Treatment on the Tensile Response of AZ61 Magnesium Alloy

[+] Author and Article Information
K. S. Tun

Department of Mechanical Engineering,
National University of Singapore,
9 Engineering Drive 1,
Singapore117576

R. Kwok

Singapore Technologies Kinetics Ltd
(ST Kinetics),
249 Jalan Boon Lay,
Singapore 619523

W. L. E. Wong

School of Mechanical and Systems Engineering,
Newcastle University International Singapore,
180 Ang Mo Kio Avenue 8,
Block P Room 220,
Singapore 569830

M. Gupta

Department of Mechanical Engineering,
National University of Singapore,
9 Engineering Drive 1,
Singapore 117576
e-mail: mpegm@nus.edu.sg

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received January 3, 2012; final manuscript received June 25, 2012; published online May 6, 2013. Assoc. Editor: Yoshihiro Tomita.

J. Eng. Mater. Technol 135(3), 031004 (May 06, 2013) (7 pages) Paper No: MATS-12-1003; doi: 10.1115/1.4023769 History: Received January 03, 2012; Revised June 25, 2012

In this paper, AZ61 magnesium alloy composites containing nanoalumina and micron-sized copper particulates are synthesized using the technique of disintegrated melt deposition followed by hot extrusion. The simultaneous addition of nano-Al2O3 and copper particulates led to an overall improvement in both microstructural characteristics in terms of distribution and morphology of secondary phases and mechanical response of AZ61. The presence of nanoalumina particulates broke down and dispersed the secondary phase Mg17Al12. The 0.2% yield strength increased from 216 MPa to 274 MPa. The ductility increased from 8.4% to 9.3% in the case of the AZ61-1.5Al2O3 sample. The results of aging heat treatment in the case of the AZ61-1.5Al2O3-1Cu sample showed significant improvement in both tensile strength, ductility, and work of fracture (54% increment). An attempt is made to correlate the tensile response of composites with their microstructural characteristics.

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Figures

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Fig. 1

Precasting materials preparation

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Fig. 2

Representative FESEM micrographs showing distribution of intermetallic phases

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Fig. 3

Stress-strain curves of samples at room temperature

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Fig. 4

Fractographs of samples showing microcracks, plastic deformation, and shear feature

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