Deformation Behavior of an Ultrafine-grained Al-Ni-Y-Co-Sc Alloy

Abstract

The low ductility of ultrafine-grained Al-Ni-Y-Co-Sc alloy in as-extruded condition was improved by introducing an additional processing step of warm forging at 673 K, 10−1 s−1. The forging resulted in uniform distribution of the intermetallic particles and change in morphologies as well as a high strain rate sensitivity index (m 0.02) as against 0.003 for as-extruded condition. The localized neck in tensile test in the form of a band has been attributed to Hill's criterion of plane strain 'no deformation' band. The other interesting observation of monotonic softening of the alloy in RT compression test has been attributed to the accumulation of damages; e.g., micro-voids/cracks, and the like.

Department(s)

Materials Science and Engineering

Sponsor(s)

United States. Defense Advanced Research Projects Agency

Keywords and Phrases

Band Neck; Nanocrystalline; Softening; Ultrafine Grain; Aluminum alloys

International Standard Serial Number (ISSN)

0921-5093

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2009 Elsevier, All rights reserved.

Publication Date

01 Jul 2009

Link to Full Text

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