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Micro-Mechanical Response of an Al-Mg Hybrid System Synthesized by High-Pressure Torsion

by Megumi Kawasaki 1,2 and Jae-il Jang 1,*
1
Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Korea
2
Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-1453, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Materials 2017, 10(6), 596; https://doi.org/10.3390/ma10060596
Received: 10 May 2017 / Revised: 26 May 2017 / Accepted: 27 May 2017 / Published: 30 May 2017
(This article belongs to the Special Issue Advanced Nanoindentation in Materials)
This paper summarizes recent efforts to evaluate the potential for the formation of a metal matrix nanocomposite (MMNC) by processing two commercial bulk metals of aluminum and magnesium alloy through high-pressure torsion (HPT) at room temperature. After significant evolutions in microstructures, successful fabrication of an Al-Mg hybrid system was demonstrated by observing unique microstructures consisting of a multi-layered structure and MMNC. Moreover, the evolution of small-scale mechanical properties was examined through the novel technique of nanoindentation and the improvement in plasticity was estimated by calculating the strain rate sensitivity of the Al-Mg hybrid system after HPT. The present paper demonstrates that, in addition to conventional tensile testing, the nanoindentation technique is exceptionally promising for ultrafine-grained materials processed by HPT, where the samples may have small overall dimensions and include heterogeneity in the microstructure. View Full-Text
Keywords: intermetallic composite; grain refinement; hardness; high-pressure torsion; nanocomposite; nanoindentation; plasticity intermetallic composite; grain refinement; hardness; high-pressure torsion; nanocomposite; nanoindentation; plasticity
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MDPI and ACS Style

Kawasaki, M.; Jang, J.-I. Micro-Mechanical Response of an Al-Mg Hybrid System Synthesized by High-Pressure Torsion. Materials 2017, 10, 596.

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