Elevated Temperature Properties Of A Dispersion Strengthened Al [Fe, V, Si] Alloy
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Authors
Cissel, Matthew B.
Subjects
Advisors
Mitra, Shantanu
Date of Issue
1991-12
Date
December 1991
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The mechanical properties at elevated temperatures of a new dispersion strengthened aluminum, iron, vanadium silicon alloy were evaluated. Constant extension rate (tension) tests were conducted on an Instron machine and strain rate sensitivity, yield stress and elongation changes with temperature were obtained. The mechanical behavior appeared to change at approximately 250 degrees C, with intergranular fracture and necking occurring at low temperatures; and transgranular dimples with uniform plastic deformation at high temperatures. Creep tests in tension were conducted and the stress dependence n, of the steady state creep rate was obtained. A change in the n value was seen from 16 down to 4 at low stresses and temperatures. The activation energy for creep was calculated from the slope of steady state creep rate vs 1/temperature plot and from an iterative technique based on plotting all the data on one curve using an approximate value of activation energy for the temperature compensated strain rate plotted against the modulus compensated stress.
Type
Thesis
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
61 p.;28 cm.
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.