The influence of warm rolling parameters (temperature and reheating time between passes) on the superplastic response of Al-Mg alloys
Authors
Kuhnert, George J., Jr.
Subjects
Recovery
Advisors
McNelley, Terry R.
Date of Issue
1988
Date
June 1988
Publisher
Language
en_US
Abstract
The effects of rolling temperature and reheating interval between consecutive rolling passes on the superplastic response of two Al-Mg alloys were investigated. The alloys were Al-8%Mg-0 .1%Zr and Al-10%Mg-0 .1%Zr (wt. pct.). The effects of varying the process parameters were observed on resultant superplastic ductility during testing at 300°C. The data support a model for microstructure evolution during processing by a mechanism of continuous recrystallization (CRX). The model for CRX assumes that dislocations recover to sub boundaries which are stabilized by precipitates, of size on the order of one micron, located at nodes of the substructure. Continued recovery results in formation of boundaries of
moderate misorientation, in the absence of the migration of a high angle boundary. The dependence of CRX on reheating time and rolling temperature was investigated and a strong dependence of subsequent superplastic response on these two processing parameters was observed. The influence of grain size on resultant superplasticity was also noted, indicating that the extent of grain refinement is limited to the spacing of particles.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
71 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.