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Significance of grain refinement on microstructure and mechanical properties of an Al-3% Mg alloy processed by high-pressure torsion

Title
Significance of grain refinement on microstructure and mechanical properties of an Al-3% Mg alloy processed by high-pressure torsion
Author
Kawasaki, Megumi
Keywords
Aluminum alloy; Deformation mechanisms; Hardness; High-pressure torsion; Strengthening mechanisms
Issue Date
2016-11
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v. 686, Page. 998-1007
Abstract
Significant grain refinement is attractive for improving mechanical properties at both ambient and elevated temperatures and improvements in the properties of light-weight metals has become indispensable for the practical and societal needs of materials selection. Experiments were conducted to examine the influence of grain refinement on the mechanical properties of an Al-3% Mg alloy processed though high-pressure torsion (HPT) at room temperature under a compressive pressure of 6.0 GPa for up to 10 turns. The hardness values from Vickers microhardness measurements demonstrated a strain hardening behavior with increasing torsional straining and a high level of homogeneous microstructure was achieved along the disk diameter after HPT for 10 turns. An X-ray diffraction analysis at the peripheral regions of the disks outside of the central areas showed an evolution towards a reasonably random texture together with increases in the dislocation density and lattice parameter of Al with increasing numbers of HPT revolutions. A maximum elongation of similar to 430% was recorded in the alloy after HPT for 5 turns when testing at 673 K at 1.0 x 10(-4) s(-1) but there was evidence for grain growth during testing and the flow behavior was controlled by viscous glide. Analysis shows that the improved hardness through HPT is well expressed by the Hall-Petch relationship with only limited contributions from solid solution strengthening and precipitation hardening. (C) 2016 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S092583881631917X?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/100847
ISSN
0925-8388; 1873-4669
DOI
10.1016/j.jallcom.2016.06.194
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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