Fabrication of nanocomposites through diffusion bonding under high-pressure torsion
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INVITED FEATURE PAPER Fabrication of nanocomposites through diffusion bonding under high-pressure torsion Megumi Kawasakia) and Jae-Kyung Han School of Mechanical, Industrial & Manufacturing Engineering, Oregon State University, Corvallis, Oregon 97331-6001, USA
Dong-Hyun Lee and Jae-il Jang Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Republic of Korea
Terence G. Langdon Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, U.K. (Received 5 April 2018; accepted 5 June 2018)
This report summarizes a recent study demonstrating simple and rapid synthesis of a new Al–Mg alloy system and ultimately synthesizing a metal matrix nanocomposite, which was achieved by processing stacked disks of the two dissimilar metals by conventional high-pressure torsion (HPT) processing. The synthesized Al–Mg alloy system exhibits exceptionally high hardness through rapid diffusion bonding and simultaneous nucleation of intermetallic phases with increased numbers of HPT turns through 20, and improved plasticity was demonstrated by increasing strain rate sensitivity in the alloy system after post-deformation annealing. An additional experiment demonstrated that the alternate stacking of high numbers of dissimilar metal disks may produce a faster metal mixture during HPT. Metal combinations of Al–Cu, Al–Fe, and Al–Ti were processed by the same HPT procedure from separate pure metals to examine the feasibility of the processing technique. The microstructural analysis confirmed the capability of HPT for the formation of heterostructures across the disk diameters in these processed alloy systems. The HPT processing demonstrates a considerable potential for the joining and bonding of dissimilar metals at room temperature and the expeditious fabrication of a wide range of new metal systems.
I. INTRODUCTION
The synthesis of new generation metals and alloys is now driven by technological issues combined with the restrictions imposed by ecological considerations in a variety of industrial applications.1 Aluminum and magnesium are conventional light-weight engineering metals, and they are widely used for structural applications in the automotive, aerospace, and electronic industries. Further consuming these conventional metals, improvements in the mechanical properties of these metals would be attractive for enhancing their future use. In practice, an earlier study demonstrated an increase in the strength limit of an aerospace-grade Al-7075 alloy after the grain refinement process through the application of high-pressure torsion (HPT) while maintaining reasonable formability.2 Nevertheless, there is probably saturation in the maximum achievable mechanical properties when the processing is conducted directly on the alloys. This suggests a new strategy for achieving superior a)
Address all correspondence to this author. e-mail: [email protected] This paper has been selected as an Invited Feature Paper. DOI: 10.1557/jmr.2018.205 J. Ma
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