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ASTM Selected Technical Papers
Rapidly Solidified Powder Aluminum Alloys
By
ME Fine
ME Fine
1
Northwestern University
,
Evanston, IL 60201
;
symposium cochairman and editor
.
Search for other works by this author on:
EA Starke, Jr Jr
EA Starke, Jr Jr
2
University of Virginia
,
Charlottesville, VA 22901
;
symposium cochairman and editor
.
Search for other works by this author on:
ISBN-10:
0-8031-0442-1
ISBN:
978-0-8031-0442-6
No. of Pages:
554
Publisher:
ASTM International
Publication date:
1986

Current U.S. Air Force programs are using aluminum powder metallurgy (PM) to extend the use of aluminum in both airframe and engine applications. The benefits of aluminum PM over conventional ingot metallurgy (IM) processing include enhanced mechanical properties resulting from a very homogeneous microstructure, extension of solid solubility limits, formation of metastable phases, and decreased grain size. During processing of the aluminum powder into a final product or into a workable preform, degassing is desirable to facilitate the breakup of the oxide skin and to disperse it. Also, the undesirable hydroxides that form must be removed to optimize mechanical properties. Although degassing has been frequently studied, evaluation techniques for degassing efficiency have been neglected.

This program deals with the development of an effective and rapid method of evaluating degassing in aluminum products. Several methods, including ultrasonic inspection, density measurements, mass spectroscopy, and optical metallography, have been studied and evaluated using 7091 alloy small laboratory compacts. The times and temperatures of degassing were varied in such a way as to ensure that both adequate and poor degassing conditions were obtained. Each method of evaluation is discussed.

1.
Kim
,
Y.-W.
,
Griffith
,
W. M.
, and
Froes
,
F. H.
, “
The Breakup and Distribution of Surface Oxides Through Processing of P/M Aluminum Alloy 7091
,”
Proceedings
,
ASM Metals Congress
,
American Society for Metals
,
Philadelphia, PA
, 1–6 Oct. 1983.
2.
Billman
,
F. R.
,
Kuli
,
J. C.
,
Hildeman
,
G. J.
,
Petit
,
J. I.
, and
Walker
,
J. A.
,
Proceedings
,
Third Conference on Rapid Solidification
,
National Bureau of Standards
,
Gaithersburg, MD
, 6–8 Dec. 1982.
3.
Lokenbach
,
A. K.
,
Strods
,
V. V.
,
Lepin
,
L. K.
,
Schule
,
A. A.
,
Abrams
,
I. A.
, and
Zaporina
,
N. A.
, “
Influence of the Initial State of the Surface on Oxidation Kinetics of Highly Dispersed Aluminum Powders
,”
Institute of Inorganic Chemistry of the Academy of Science of the Latvian Soviet Socialist Republic
,
Riga, Latvia
,
1982
.
4.
Cebulak
,
W. W.
, “
Program to Develop High-Strength Aluminum Powder Metallurgy Products
,” Quarterly Report, Contract DAAA25-72-C-593,
U.S. Army Frankford Arsenal
, Philadelphia, PA, May/June 1973.
5.
Otto
,
W. L.
, Jr.
, “
Metallurgical Factors Controlling Structure in High-Strength Aluminum Products
,” Technical Report AFML-TR-76-60,
Air Force Materials Laboratory, Wright-Patterson Air Force Base
, OH,
05
1976
.
6.
Bohlen
,
J. W.
,
Roberts
,
S. G.
, and
Chanani
,
G. R.
, “
Investigation of Improved Methods for Consolidating Rapidly Solidified Aluminum Alloy Powder
,”
Northrop Corporation Technical Report
NOR 82-4,
Northrop Corp.
, Hawthorne, CA,
06
1982
.
7.
Griffith
,
W. M.
and
Cook
,
M. M.
, “
Effect of Varying Quench Rates and Heating Rates on the Aging Response of an Aluminum P/M Alloy
,” Technical Report AFML-TR-77-67,
Air Force Materials Laboratory, Wright-Patterson Air Force Base
, OH,
07
1977
.
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