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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

The amount of liquid undercooling attained during rapid solidification processing (RSP) is an important factor in determining microstructural development. An effective experimental method that may be applied in assessing undercooling potential involves the examination of a dispersion of stabilized, fine (5 to 20-µm) liquid droplets. Substantial undercoolings (ΔT ≥ 160°C) have been measured by differential thermal analysis for slowly cooled (30°C/min) droplet emulsions of aluminum alloys. Results from Al-Si and Al-Fe alloys indicate that undercooling is a function of droplet size, melt super-heating, and material composition. Comparison studies have also been conducted relating the amount of undercooling to microstructural refinement in alloys prepared as droplet emulsions and by air atomization. The results indicate that at large undercooling (ΔT > 260°C) droplet solidification can yield a microstructure similar to that formed in atomized powder. Microstructural variations with powder size are related not only to a changing cooling rate but also to a modified undercooling behavior. These observations highlight the role of undercooling in RSP and indicate that the droplet approach can be effective in examining potential aluminum powder metal alloys and in optimizing processing procedures for rapid quenching treatments.

1.
Cohen
,
M.
,
Kear
,
B. H.
, and
Mehrabian
,
R.
in
Rapid Solidification Processing: Principles and Technologies II
,
Mehrabian
R.
,
Kear
B. H.
, and
Cohen
M.
, Eds.,
Claitors Publishing Division
,
Baton Rouge, LA
,
1980
, pp. 1-23.
2.
Hirth
,
J. P.
,
Metallurgical Transactions A
, Vol.
9A
,
1978
, pp. 401-404.
3.
Levi
,
C. G.
and
Mehrabian
,
R.
,
Metallurgical Transactions A
, Vol.
13A
,
1982
, pp. 221-234.
4.
Spear
,
R. E.
and
Gardner
,
G. R.
,
Transactions of the American Foundrymen's Society
, Vol.
71
,
1963
, pp. 209-215.
5.
Phillips
,
H. W. L.
,
Journal of the Institute of Metals
 0020-2975, Vol.
69
,
1943
, pp. 275-316.
6.
Bäckerud
,
L.
,
Jernkontorets Annaler
 0021-5902, Vol.
152
,
1968
, pp. 109-138.
7.
Perepezko
,
J. H.
and
Anderson
,
I. E.
in
Synthesis and Properties of Metastable Phase
,
Rowland
T. J.
and
Machlin
E. S.
, Eds.,
The Metallurgical Society of the American Institute of Mining, Metallurgical, and Petroleum Engineers
,
Wasrrendale, PA
,
1980
, pp. 31-63.
8.
Perepezko
,
J. H.
in
Rapid Solidification Processing: Principles and Technologies II
,
Mehrabian
R.
,
Kear
B. H.
, and
Cohen
M.
, Eds.,
Claitors Publishing Division
,
Baton Rouge, LA
,
1980
, pp. 56-67.
9.
Perepezko
,
J. H.
and
Paik
,
J. S.
in
Rapidly Solidified Amorphous and Crystalline Alloys
,
Kear
B. H.
,
Giessen
B. C.
, and
Cohen
M.
, Eds.,
North Holland
,
New York
,
1982
, pp. 49-63.
10.
LeBeau
,
S. E.
, Ph.D. thesis,
University of Wisconsin
, Madison, WI,
1982
.
11.
Perepezko
,
J. H.
,
Materials Science and Engineering
, Vol.
65
,
1984
, pp. 125-135.
12.
Mondolfo
,
L. F.
and
Barlock
,
J. G.
,
Metallurgical Transactions B
, Vol.
6B
,
1975
, pp. 565-572.
13.
Marcantonio
,
J. A.
and
Mondolfo
,
L. F.
,
Metallurgical Transactions
 0026-086X, Vol.
5
,
1974
, pp. 1325-1329.
14.
Mondolfo
,
L. F.
,
Aluminum Alloys: Structures and Properties
,
Butlerworth
,
Boston
,
1976
.
15.
Hollingsworth
,
E. H.
,
Frank
,
G. R.
, Jr.
, and
Willett
,
R. E.
,
Transactions of the Metallurgical Society of A.I.M.E.
, Vol.
224
,
1962
, pp. 188-189.
16.
Adam
,
C. M.
and
Hogan
,
L. M.
,
Journal of the Australian Institute of Metals
 0004-9352, Vol.
17
,
1972
, pp. 81-90.
17.
Hughes
,
I. R.
and
Jones
,
H.
,
Journal of Materials Science
 0022-2461, Vol.
11
,
1976
, pp. 1781-1793.
18.
Tonjec
,
A.
and
Bonefacic
,
A.
,
Journal of Applied Physics
 0021-8979, Vol.
40
,
1969
, pp. 419-420.
19.
Jones
,
H.
,
Materials Science and Engineering
, Vol.
5
,
1969
, pp. 1-18.
20.
Suzuki
,
H.
,
Kanno
,
M.
,
Tanabe
,
H.
, and
Itoi
,
K.
,
Journal of the Japanese Institute of Light Metals
, Vol.
28
,
1978
, pp. 558-563.
21.
Hughes
,
I. R.
and
Jones
,
H.
,
Journal of Materials Science
 0022-2461, Vol.
12
,
1977
, pp. 323-333.
22.
Adam
,
C. M.
and
Bordeau
,
R. G.
in
Rapid Solidification Processing: Principles and Technologies II
,
Mehrabian
R.
,
Kear
B. H.
, and
Cohen
M.
, Eds.,
Claitors Publishing Division
,
Baton Rouge, LA
,
1980
, pp. 246-259.
23.
Hildeman
,
G. J.
,
Lege
,
D. J.
, and
Vasudevan
,
A. K.
in
High-Strength Powder Metallurgy Aluminum Alloys
,
Koczak
M. J.
and
Hildeman
G. J.
, Eds.,
The Metallurgical Society of the American Institute of Mining, Metallurgical, and Petroleum Engineers
,
Warrendale, PA
,
1982
, pp. 249-276.
24.
Perepezko
,
J. H.
and
LeBeau
,
S. E.
in
Aluminum Transformation Technology and Applications—1981
,
Pampillo
C. A.
,
Biloni
H.
,
Mondolfo
L. F.
, and
Sacchi
F.
, Eds.,
American Society for Metals
,
Metals Park, OH
,
1982
, pp. 309-346.
25.
Turnbull
,
D.
,
Journal of Applied Physics
 0021-8979, Vol.
21
,
1950
, pp. 1022-1028.
26.
Hultgren
,
R.
,
Desai
,
P. D.
,
Hawkins
,
D. T.
,
Glesier
,
M.
,
Kelley
,
K. K.
, and
Wagman
,
D. D.
,
Selected Values of Thermodynamic Properties of the Elements
,
American Society for Metals
,
Metals Park, OH
,
1973
, pp. 25-31.
27.
Perepezko
,
J. H.
,
Rasmussen
,
D. H.
,
Anderson
,
I. E.
, and
Loper
,
C. R.
, Jr.
, in
Solidification and Casting of Metals
,
The Metals Society
,
London
,
1979
, pp. 169-174.
28.
Eustathopoulos
,
N.
,
Coudurier
,
L.
,
Joud
,
J. C.
, and
Desre
,
P.
,
Journal of Crystal Growth
 0022-0248, Vol.
33
,
1976
, pp. 105-115.
29.
Perepezko
,
J. H.
,
Shiohara
,
Y.
,
Paik
,
J. S.
, and
Flemings
,
M. C.
in
Rapid Solidification Processing: Principles and Technologies III
,
Mehrabian
R.
, Ed.,
National Bureau of Standards
,
Washington, DC
,
1983
, pp. 28-44.
30.
Young
,
R. M. K.
and
Clyne
,
T. W.
,
Scripta Metallurgica
, Vol.
15
,
1981
, pp. 1211-1216.
31.
Shechtman
,
D.
and
Swartzendruber
,
L. J.
,
Materials Research Society Symposium Proceedings
 0272-9172, Vol.
19
,
1983
, pp. 265-268.
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