Open Access System for Information Sharing

Login Library

 

Article
Cited 10 time in webofscience Cited 11 time in scopus
Metadata Downloads

Microstructural evolution during superplastic deformation of a 7475 Al alloy SCIE SCOPUS

Title
Microstructural evolution during superplastic deformation of a 7475 Al alloy
Authors
Shin, DHJoo, YJKim, WJLee, CS
Date Issued
1998-06-15
Publisher
KLUWER ACADEMIC PUBL
Abstract
Grain refinement of a superplastic 7475 Al alloy is observed at strain rates of 10(-2)s(-1) or higher. Metallographic observation shows that the average grain size is changed from 14 mu m to 10 mu m after 100% elongation. Two-stage strain-rate tests were performed on the 7475 Al alloy to correlate grain refinement with an improvement of superplasticity. The optimum first strain rate and strain in the first stage were determined through tensile superplastic tests. Superplasticity was improved significantly through two-stage strain-rate testing. This is believed to be related to the refinement of the initial grains at high strain rate. The specimen tested at a strain rate of 2.1 x 10(-4)s(-1) revealed dispersoid-free zones (DFZs) near grain boundaries normal to the stress axis. When a higher strain rate was applied to the specimens with DFZs, no grain refinement was observed. The absence of grain refinement is due to the concentration of plastic deformation in the weak DFZs. (C) 1998 Kluwer Academic Publishers.
Keywords
GRAIN-SIZE; ALUMINUM
URI
https://oasis.postech.ac.kr/handle/2014.oak/20566
DOI
10.1023/A:1004383420256
ISSN
0022-2461
Article Type
Article
Citation
JOURNAL OF MATERIALS SCIENCE, vol. 33, no. 12, page. 3073 - 3078, 1998-06-15
Files in This Item:
There are no files associated with this item.

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher

이종수LEE, CHONG SOO
Ferrous & Energy Materials Technology
Read more

Views & Downloads

Browse