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.
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M.F. Smith, J.E. Brockmann, R.C. Dykhuizen, D.L. Gilmore, R.A. Neiser, and T.J. Roemer, Cold Spray Direct Fabrication-High Rate Solid State, Material Consolidation, Mater. Res. Soc. Symp. Proc., 1999, 542, p 65–76
D.L. Gilmore, R.C. Dykhuizen, R.A. Neiser, T.J. Roemer, and M.F. Smith, Particle Velocity and Deposition Efficiency in the Cold Spray Process. J. Thermal Spray Technol. 1999, 8(4), p 576–582
R.C. Dykhuizen, M.F. Smith, D.L. Gilmore, R.A. Neiser, X. Jiang, and S. Sampath, Impact of High Velocity Cold Spray Particles, J. Thermal Spray Technol., 1999, 8(4), p 559–564
“Standard Test Methods for Tension Testing of Metallic Materials”, E8-04, Annual Book of ASTM Standards, ASTM, 2004
J.R. Michael and R.P. Goehner, Electron Backscatter Diffraction: A Powerful Tool for Phase Identification in the SEM, Materials Research Society Fall Meeting Nov 29–Dec 3 (Boston, MA), 1999
Physical Metallurgy of Aluminum Alloys, Metals Handbook, Desk Edition, 2nd ed., J.R. Davis, Ed., ASM International, 1998, p 462
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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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Hall, A.C., Cook, D.J., Neiser, R.A. et al. The effect of a simple annealing heat treatment on the mechanical properties of cold-sprayed aluminum. J Therm Spray Tech 15, 233–238 (2006). https://doi.org/10.1361/105996306X108138
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DOI: https://doi.org/10.1361/105996306X108138