The effect of a simple annealing heat treatment on the mechanical properties of cold-sprayed aluminum |
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Authors: | A C Hall D J Cook R A Neiser T J Roemer D A Hirschfeld |
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Affiliation: | (1) Sandia National Laboratories, P.O. Box 5800, MS 1130, 87123-1130 Albuquerque, NM;(2) Department of Materials and Metallurgical Engineering, New Mexico Institute of Mining and Technology, 801 Leroy Place, 87801 Soccoro, NM |
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Abstract: | Cold spray, a new member of the thermal spray process family, can be used to prepare dense, thick metal coatings. It has tremendous
potential as a spray-forming process. However, it is well known that significant cold work occurs during the cold spray deposition
process. This cold work results in hard coatings but relatively brittle bulk deposits. This work investigates the mechanical
properties of cold-sprayed aluminum and the effect of annealing on those properties. Cold spray coatings approximately 1 cm
thick were prepared using three different feedstock powders: Valimet H-10: Valimet H-20: and Brodmann Flomaster. ASTM E8 tensile
specimens were machined from these coatings and tested using standard tensile testing procedures. Each material was tested
in two conditions: as-sprayed; and after a 300°C, 22h air anneal. The as-sprayed material showed high ultimate strength and
low ductility, with <1% elongation. The annealed samples showed a reduction in ultimate strength but a dramatic increase in
ductility, with up to 10% elongation. The annealed samples exhibited mechanical properties that were similar to those of wrought
1100 H14 aluminum. Microstructural examination and fractography clearly showed a change in fracture mechanism between the
as-sprayed and annealed materials. These results indicate good potential for cold spray as a bulkforming process.
The original version of this paper was published in the CD ROM Thermal Spray Connects: Explore Its Surfacing Potential, International Thermal Spray Conference, sponsored by DVS, ASM International, and HW International Institute of Welding,
Basel, Switzerland, May 2–4, 2005, DVS-Verlag GmbH, Düsseldorf, Germany. |
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Keywords: | aluminum cold spray heat treatment mechanical properties spray forming |
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