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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

Various Al-Cu alloy powder particles were produced by electrohydrodynamic atomization. The particles produced by this process range in size from 3 nm to 2 μm. The microstructure of the submicrometre particles is shown, and a discussion of their cooling rates and solidification history is presented.

The alloys produced included various compositions of aluminum and copper. Extended solid solubility was observed in all the alloys and was dependent on the particle size and concentration. The particles produced from alloy concentrations beyond the equilibrium solubility limit which exhibit segregation-free microstructure probably solidified after undercooling sufficiently to produce the interfacial temperatures and velocities necessary to suppress segregated growth. These aspects of solidification are discussed and estimates of the cooling rates and bulk undercoolings achieved are given. Some of the particles show a transition from partitionless solidification to a segregated, cellular solidification.

1.
Levi
,
C. G.
and
Mehrabian
,
R.
,
Metallurgical Transactions
 0026-086X, Vol.
13A
,
1982
, pp. 13-23.
2.
Cohen
,
M.
and
Mehrabian
,
R.
,
Proceedings
,
Third Conference on Rapid Solidification Processing, National Bureau of Standards
,
12
1982
, pp. 1-27.
3.
Shechtman
,
D.
,
Ridder
,
S. D.
, and
Mehrabian
,
R.
,
Proceedings
,
Third Conference on Rapid Solidification Processing, National Bureau of Standards
,
12
1982
, pp. 96-104.
4.
Perel
,
J.
,
Mahoney
,
J. F.
,
Kalensher
,
B. E.
, and
Vickers
,
K. E.
,
Proceedings
,
International Conference on Rapid Solidification Processing
,
Reston, VA
,
11
1977
, pp. 258-269.
5.
Perepezko
,
J. H.
,
Proceedings
,
Second International Conference on Rapid Solidification Processing
,
Reston, VA
,
03
1980
, pp. 56-67.
6.
Coriell
,
S. R.
, and
Sekerka
,
R. F.
,
Proceedings
,
Second International Conference on Rapid Solidification Processing
,
Reston, VA
,
03
1980
, pp. 35-49.
7.
Mehrabian
,
R.
,
International Metals Review
, Vol.
27
,
1982
, pp. 185-208.
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