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Developing Superplasticity in Ultrafine-Grained Metals

Title
Developing Superplasticity in Ultrafine-Grained Metals
Author
Megumi Kawasaki
Keywords
HIGH-PRESSURE TORSION; STRAIN-RATE SUPERPLASTICITY; DEFORMATION-MECHANISM MAPS; SEVERE PLASTIC-DEFORMATION; CU EUTECTIC ALLOY; ZN-22 PCT AL; FLOW MECHANISMS; MICROSTRUCTURAL EVOLUTION; ACTIVATION-ENERGIES; CREEP MECHANISMS
Issue Date
2015-10
Publisher
POLISH ACAD SCIENCES INST PHYSICS
Citation
ACTA PHYSICA POLONICA A, v. 128, NO 4, Page. 470-478
Abstract
The processing of bulk metals through the application of severe plastic deformation provides an opportunity for achieving exceptional grain refinement with grain sizes typically lying in the submicrometer or even the nanometer range. Provided these small grains are reasonably stable at elevated temperatures, these ultrafine-grained metals will exhibit excellent superplastic properties when pulled in tension at elevated temperatures. Most ultrafine-grained materials have been produced using either equal-channel angular pressing or high-pressure torsion. This paper examines the results for superplasticity reported to date using metallic alloys processed by equal-channel angular pressing and high-pressure torsion, compares the experimental strain rates with those predicted using the theoretical model for conventional superplastic flow and then demonstrates the feasibility of preparing deformation mechanism maps that provide comprehensive information on the flow mechanisms.
URI
http://przyrbwn.icm.edu.pl/APP/PDF/128/a128z4p02.pdfhttp://hdl.handle.net/20.500.11754/28477
ISSN
0587-4246; 1898-794X
DOI
10.12693/APhysPolA.128.470
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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