The contribution of grain boundary sliding in tensile deformation of an ultrafine-grained aluminum alloy having high strength and high ductility

Title
The contribution of grain boundary sliding in tensile deformation of an ultrafine-grained aluminum alloy having high strength and high ductility
Authors
Kawasaki, Megumi
Keywords
SEVERE PLASTIC-DEFORMATION;; HIGH-PRESSURE TORSION; ATOMIC-FORCE MICROSCOPY; RESOLUTION ELECTRON-MICROSCOPY; SUPERPLASTIC FLOW; ROOM-TEMPERATURE; AL-ALLOY; METALS; BEHAVIOR; SHEAR
Issue Date
2015-05
Publisher
SPRINGER
Citation
JOURNAL OF MATERIALS SCIENCE, v. 50, NO 10, Page. 3549-3561
Abstract
An as-cast Al-7 % Si alloy was processed by high-pressure torsion (HPT) for up to 10 turns at temperatures of 298 or 445 K. The HPT-processed samples had ultrafine-grained structures and they were tested in tension at room temperature at various strain rates in the range from 1.0 x 10(-4) to 1.0 x 10(-2) s(-1). The contributions of grain boundary sliding (GBS) to the total strain were measured directly using atomic force microscopy. Samples simultaneously showing both high strength and high ductility contained the highest fractions of high-angle grain boundaries (HAGB) and exhibited the highest contributions from GBS, whereas samples showing high strength but low ductility gave negligible values for the sliding contributions. It is concluded that high strength and high ductility require both an ultrafine grain size and a high fraction of HAGB.
URI
http://link.springer.com/article/10.1007%2Fs10853-015-8915-2http://hdl.handle.net/20.500.11754/24754
ISSN
0022-2461; 1573-4803
DOI
http://dx.doi.org/10.1007/s10853-015-8915-2
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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