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Non-Equilibrium Synthesis by Laser for Tailored Surfaces
Abstract Rapid heating and cooling rate associated with laser processing provides an unique opportunity for non-equilibrium synthesis of materials which can provide compositions with extended solid solution. With proper selection of alloying elements and process parameters, materials with tailored properties can be synthesized. This paper discusses the theoretical basis for the mechanisms and the experimental approach for non-equilibrium synthesis of materials tailored for various applications such as wear, high temperature oxidation and corrosion resistance. Non-equilibrium partitioning due to rapid solidification is explained based on the atom trapping theory. A mathematical model involving heat and mass transfer and non-equilibrium partition coefficient is used to predict the non-equilibrium phase diagram and establish a relationship between the process parameters and the final alloy composition. Experimental procedure is discussed and the microstructure and properties of non-equilibrium alloys for various applications are described. Microstructure was characterized using various electron optical techniques such as Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Auger Electron Spectroscopy (AES) and Energy Dispersive X-Ray Analysis (EDAX). Room temperature wear properties were characterized by a line contact Block on Cylinder method, high temperature wear tests were similar to simulated engine test. High temperature oxidation properties were characterized by using Perkin-Elmer Thermo-Gravimetric Analyzer (TGA) where dynamic weight change were monitored at 1200°C. Corrosion properties were evaluated by a potentio-dynamic method using a computer controlled Potentiostat manufactured by EG&G.
Non-Equilibrium Synthesis by Laser for Tailored Surfaces
Abstract Rapid heating and cooling rate associated with laser processing provides an unique opportunity for non-equilibrium synthesis of materials which can provide compositions with extended solid solution. With proper selection of alloying elements and process parameters, materials with tailored properties can be synthesized. This paper discusses the theoretical basis for the mechanisms and the experimental approach for non-equilibrium synthesis of materials tailored for various applications such as wear, high temperature oxidation and corrosion resistance. Non-equilibrium partitioning due to rapid solidification is explained based on the atom trapping theory. A mathematical model involving heat and mass transfer and non-equilibrium partition coefficient is used to predict the non-equilibrium phase diagram and establish a relationship between the process parameters and the final alloy composition. Experimental procedure is discussed and the microstructure and properties of non-equilibrium alloys for various applications are described. Microstructure was characterized using various electron optical techniques such as Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Auger Electron Spectroscopy (AES) and Energy Dispersive X-Ray Analysis (EDAX). Room temperature wear properties were characterized by a line contact Block on Cylinder method, high temperature wear tests were similar to simulated engine test. High temperature oxidation properties were characterized by using Perkin-Elmer Thermo-Gravimetric Analyzer (TGA) where dynamic weight change were monitored at 1200°C. Corrosion properties were evaluated by a potentio-dynamic method using a computer controlled Potentiostat manufactured by EG&G.
Non-Equilibrium Synthesis by Laser for Tailored Surfaces
Mazumder, J. (author)
1996-01-01
29 pages
Article/Chapter (Book)
Electronic Resource
English
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