Spray forming of superplastic aluminum sheet
- Battelle Pacific Northwest Labs., Richland, WA (United States)
- Idaho National Engineering Lab., Idaho Falls, ID (United States)
Ingot metallurgy (I/M) processing methods for superplastic aluminum sheet require substantial hot, warm and final cold rolling reduction steps to produce the desired fine grain size and thermally-stable microstructure necessary for superplastic forming (SPF). The rapid solidification rates associated with spray forming offer the potential for economic processing of near net-thickness SPF sheet having alloy compositions that are not possible with conventional ingot metallurgy. To evaluate the application of spray forming for SPF aluminum sheet, a modified 5083 alloy was supplied to Idaho National Engineering Laboratory for processing using laboratory spray-forming equipment. Spray-formed sheet specimens were then supplied to the Battelle Pacific Northwest Laboratory for characterization and comparison with conventional I/M-based SPF sheet. Results show that the spray formed material, when processed using appropriate homogenization and cold reduction steps (3:1 total reduction), has an equiaxed grain size of 2--4 {micro}m near the deposition substrate. However, microstructural examination indicates that grain size increases as a function of the distance from the deposition substrate. Tensile tests were conducted at a temperature of 550 C and constant strain rates over a range of 5 {times} 10{sup {minus}4} to 5 {times} 10{sup {minus}3} s{sup {minus}1} to evaluate the superplastic behavior of the spray-formed samples. Results show that the spray-formed material having a 3:1 cold rolling reduction has superplastic elongation equivalent to I/M materials processed with a 60:1 reduction.
- DOE Contract Number:
- AC06-76RL01830; AC07-94ID13223
- OSTI ID:
- 186748
- Report Number(s):
- CONF-950201-; ISBN 0-87339-316-3; TRN: IM9609%%20
- Resource Relation:
- Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Las Vegas, NV (United States), 12-16 Feb 1995; Other Information: PBD: 1995; Related Information: Is Part Of Synthesis/processing of lightweight metallic materials. Proceedings; Froes, F.H.; Suryanarayana, C. [eds.] [Univ. of Idaho, Moscow, ID (United States). Inst. for Materials and Advanced Processes]; Ward-Close, C.M. [ed.] [Defence Research Agency, Farnborough (United Kingdom)]; PB: 380 p.
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM BASE ALLOYS
SPRAY COATING
MICROSTRUCTURE
TENSILE PROPERTIES
MAGNESIUM ALLOYS
MANGANESE ALLOYS
LIQUID METALS
INTERMETALLIC COMPOUNDS
HEAT TREATMENTS
ROLLING
RECRYSTALLIZATION
OPTICAL MICROSCOPY
SCANNING ELECTRON MICROSCOPY
GRAIN SIZE
GRAIN BOUNDARIES
ELONGATION
PLASTICITY
EXPERIMENTAL DATA