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Evolution of microhardness and microstructure in a cast Al-7 % Si alloy during high-pressure torsion

Title
Evolution of microhardness and microstructure in a cast Al-7 % Si alloy during high-pressure torsion
Author
Megumi Kawasaki
Keywords
SEVERE PLASTIC-DEFORMATION; WEAR CHARACTERISTICS; GRAIN-REFINEMENT; PROCESSING TOOL; HOMOGENEITY; ALUMINUM; SUPERPLASTICITY; EXAMINE; METALS; PATH
Issue Date
2013-07
Publisher
SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Citation
JOURNAL OF MATERIALS SCIENCE 권: 48 호: 13 페이지: 4671-4680
Abstract
Disks of a cast Al-7 % Si alloy were processed through high-pressure torsion (HPT) for 1/4, 1/2, 1, 5, and 10 revolutions under a pressure of 6.0 GPa and at temperatures of 298 and 445 K. The hardness of the samples after processing was significantly higher than in the cast sample, and the hardness profiles across the samples became more uniform with increasing numbers of turns. Processing at higher temperature gave lower hardness values. Experiments were conducted to examine the effects of HPT processing on various microstructural aspects of the cast Al-7 % Si alloy such as the grain size, the Taylor factor, and the fraction of high-angle grain boundaries. The results demonstrate that there is a correlation between trends in the microhardness values and the observed microstructures.
Description
National Science Foundation of the United States
URI
http://dx.doi.org/10.1007/s10853-012-7061-3http://hdl.handle.net/20.500.11754/44190
ISSN
1573-4803
DOI
10.1007/s10853-012-7061-3
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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