The effect of a simple annealing heat treatment on the mechanical properties of cold-sprayed aluminum

被引:0
作者
A. C. Hall
D. J. Cook
R. A. Neiser
T. J. Roemer
D. A. Hirschfeld
机构
[1] Sandia National Laboratories,Department of Materials and Metallurgical Engineering
[2] New Mexico Institute of Mining and Technology,undefined
来源
Journal of Thermal Spray Technology | 2006年 / 15卷
关键词
aluminum; cold spray; heat treatment; mechanical properties; spray forming;
D O I
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中图分类号
学科分类号
摘要
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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页码:233 / 238
页数:5
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