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Study Data from South Dakota School of Mines and Technology Update Understanding of Coatings Technology (Microstructural evolution of 7075 Al gas...

July 29, 2014



Study Data from South Dakota School of Mines and Technology Update Understanding of Coatings Technology (Microstructural evolution of 7075 Al gas atomized powder and high-pressure cold sprayed deposition)

By a News Reporter-Staff News Editor at Journal of Technology -- Investigators publish new report on Coatings Technology. According to news reporting out of Rapid City, South Dakota, by VerticalNews editors, research stated, "This study investigates the microstructure evolution of as-atomized 7075 aluminum powder during high pressure cold spray deposition. The as-received powder and the deposition were characterized via scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy."

Our news journalists obtained a quote from the research from the South Dakota School of Mines and Technology, "The as-received powder was composed of two different particle types, differentiated by their grain boundary structure and solute element distribution. Significant solute element segregation was observed at grain boundaries for both particle types. The powder also contained nanoscale subgrain and dislocation structures. High pressure cold spray resulted in the formation of a high quality deposition with limited porosity and inter-particle voids. The deposition was characterized by two distinct regions: particle/particle boundaries and particle interiors. Particle/particle boundaries showed a high degree of deformation resulting in the formation of an ultra-fine grain structure and a low density of low angle grain boundaries. The formation of the ultra-fine grain structure is attributed to dynamic recrystallization and recovery processes. Particle interiors were characterized by larger grains containing a high density of low angle grain boundaries and dislocation structure. Large grains in the deposition contained precipitates distributed both within the grain interior and at grain boundaries. Precipitates in small grains were distributed primarily at grain boundaries."

According to the news editors, the research concluded: "The effect of these precipitates on the microstructure evolution was also discussed."

For more information on this research see: Microstructural evolution of 7075 Al gas atomized powder and high-pressure cold sprayed deposition. Surface & Coatings Technology, 2014;251():254-263. Surface & Coatings Technology can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier - www.elsevier.com; Surface & Coatings Technology - www.elsevier.com/wps/product/cws_home/504101)

Our news journalists report that additional information may be obtained by contacting M.R. Rokni, South Dakota Sch Mines & Technol, Adv Mat Proc Center, Dept. of Mat & Met Engn, Rapid City, SD 57701, United States. Additional authors for this research include C.A. Widener and G.A. Crawford.

Keywords for this news article include: Rapid City, South Dakota, United States, North and Central America, Coatings Technology

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Journal of Technology


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