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Using high-pressure torsion to process an aluminum-magnesium nanocomposite through diffusion bonding

Title
Using high-pressure torsion to process an aluminum-magnesium nanocomposite through diffusion bonding
Author
Kawasaki, Megumi
Keywords
SEVERE PLASTIC-DEFORMATION; AL-MG ALLOYS; MECHANICAL-PROPERTIES; MICROSTRUCTURAL EVOLUTION; ARB PROCESS; HARDNESS EVOLUTION; GRAIN-REFINEMENT; GROWTH-KINETICS; ZN; COPPER
Issue Date
2016-01
Publisher
CAMBRIDGE UNIV PRESS
Citation
JOURNAL OF MATERIALS RESEARCH, v. 31, NO 1, Page. 88-99
Abstract
Disks of commercial Al-1050 and ZK60A alloys were stacked together and then processed by conventional high-pressure torsion (HPT) through 1 and 5 turns at room temperature to investigate the synthesis of an Al-Mg alloy system. Measurements of microhardness and observations of the microstructures and local compositions after processing through 5 turns revealed the formation of an ultrafine multi-layered structure in the central region of the disk but with an intermetallic beta-Al3Mg2 phase in the form of nano-layers in the nanostructured Al matrix near the edge of the disk. The activation energy for diffusion bonding of the Al and Mg phases was estimated and it is shown that this value is low and consistent with surface diffusion due to the very high density of vacancy-type defects introduced by HPT processing. The results demonstrate a significant potential for making use of HPT processing in the preparation of new alloy systems.
URI
https://www.cambridge.org/core/journals/journal-of-materials-research/article/using-highpressure-torsion-to-process-an-aluminummagnesium-nanocomposite-through-diffusion-bonding/2AF29BD78BE0ED0E70862A16D56075B1http://hdl.handle.net/20.500.11754/30542
ISSN
0884-2914; 2044-5326
DOI
10.1557/jmr.2015.257
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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