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Review: achieving superplastic properties in ultrafine-grained materials at high temperatures

Title
Review: achieving superplastic properties in ultrafine-grained materials at high temperatures
Author
Kawasaki, Megumi
Keywords
HIGH-PRESSURE TORSION; STRAIN-RATE SUPERPLASTICITY; SEVERE PLASTIC-DEFORMATION; ZN-22-PERCENT AL-ALLOY; CHANNEL-ANGULAR EXTRUSION; BOUNDARY SLIDING BEHAVIOR; AZ91 MAGNESIUM ALLOY; MICROSTRUCTURAL EVOLUTION; ALUMINUM-ALLOY; MECHANICAL-PROPERTIES
Issue Date
2016-01
Publisher
SPRINGER
Citation
JOURNAL OF MATERIALS SCIENCE, v. 51, NO 1, Page. 19-32
Abstract
The mechanisms of superplasticity occurring in conventional materials, having grains sizes of the order of a few microns, are now understood reasonably well. However, very recent advances in the processing of ultrafine-grained (UFG) metals have provided an opportunity to extend the understanding of flow behavior to include UFG materials with submicrometer grain sizes. In practice, processing through the application of severe plastic deformation (SPD), as in equal-channel angular pressing (ECAP) and high-pressure torsion (HPT), has permitted the fabrication of relatively large samples having UFG microstructures. Since the occurrence of superplastic flow generally requires a grain size smaller than similar to 10 mu m, it is reasonable to anticipate that materials processed by SPD will exhibit superplastic ductilities when pulled in tension at elevated temperatures. This review examines recent results that demonstrate the occurrence of exceptional superplastic flow in a series of UFG aluminum and magnesium alloys after ECAP and HPT. The results are analyzed to evaluate the superplastic flow mechanism and to compare with materials processed using different techniques. The critical issue of microstructural inhomogeneity is examined in two-phase UFG materials after SPD processing and the influence of microstructural homogeneity on the superplastic properties is also demonstrated.
URI
https://link.springer.com/article/10.1007%2Fs10853-015-9176-9http://hdl.handle.net/20.500.11754/31710
ISSN
0022-2461; 1573-4803
DOI
10.1007/s10853-015-9176-9
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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