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Research Papers

Enhancing Uniform, Nonuniform, and Total Failure Strain of Aluminum by Using SiC at Nanolength Scale

[+] Author and Article Information
Sanjay Kumar Thakur

 Delphi Automotive Systems Singapore Pte Ltd., 501 Ang Mo Kio Industrial Park 1, Singapore 569621, Singapore

Khin Sandar Tun, Manoj Gupta

Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore

J. Eng. Mater. Technol 132(4), 041002 (Sep 08, 2010) (6 pages) doi:10.1115/1.4002150 History: Received April 06, 2010; Revised June 16, 2010; Published September 08, 2010; Online September 08, 2010

The present study reports a unique tensile response of pure aluminum triggered due to the presence of SiC particles at nanolength scale. Al/SiC nanocomposites were synthesized by using energy efficient microwave assisted powder metallurgy route. Characterization studies conducted on the extruded samples revealed that the increasing presence of SiC particles at nanolength scale did not affect the 0.2% yield strength but increased ultimate tensile strength and work of fracture. Most interestingly, the presence of SiC nanoparticles increased the uniform, nonuniform, and total strain of aluminum when compared with pure aluminum. An attempt has been made in this study to inter-relate the enhanced tensile response of aluminum with the ability of SiC nanoparticles to homogenize the slip process and to delay void initiation and coalescence during tensile loading.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Representative FESEM micrographs showing presence of SiC nanoparticles (marked by arrows) in (a) Al+0.75%SiC and (b) Al+1%SiC nanocomposites

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Figure 2

Graph showing 0.2% YS and UTS of the Al and its composite specimens

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Figure 3

Representative stress strain curves of Al and Al+SiC samples

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Figure 4

Schematic model showing tensile failure mechanism in (a) pure Al and (b) Al/SiC nanocomposites

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Figure 5

SEM micrograph at 1000× magnification showing fractured surface of (a) pure Al, (b) Al+0.25%SiC, and (c) Al+0.5%SiC

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Figure 6

Distribution and average size of dimples in Al and Al+SiC nanocomposites

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