Microstructures and hardness of ultrafine-grained Ni[sub 3]Al
The microstructural evolution of the ultrafine-grained intermetallic compound Ni[sub 3]Al is studied as a function of annealing at different temperatures. The ultrafine microstructure is produced by a high plastic torsional straining. Transmission electron microscopy, X-ray diffraction and different...
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Published in: | Acta metallurgica et materialia 1993-10, Vol.41:10 |
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container_title | Acta metallurgica et materialia |
container_volume | 41:10 |
creator | Languillaume, J. Chmelik, F. Kapelski, G. Bordeaux, F. Nazarov, A.A. Canova, G. Valiev, R.Z. Baudelet, B. Esling, C. |
description | The microstructural evolution of the ultrafine-grained intermetallic compound Ni[sub 3]Al is studied as a function of annealing at different temperatures. The ultrafine microstructure is produced by a high plastic torsional straining. Transmission electron microscopy, X-ray diffraction and differential scanning calorimetry are used to characterize the microstructural evolution and microhardness is used to determine mechanical behavior. The as-deformed microstructure exhibits an almost fully disordered crystalline structure with coherent domain size of about 18 nm, a strong torsional texture and high internal elastic strains. On annealing the as-deformed samples at different temperatures, the recrystallization of the material into a granular type structure containing non-equilibrium grain boundaries is first observed. This is followed by the transformation from non-equilibrium into equilibrium grain boundaries with simultaneous grain growth. This transformation is correlated with an increase of hardness. A new concept of non-equilibrium grain boundaries transparency is presented to interpret this singular behavior. The results are compared to those obtained on an ultrafine-grained Al-1.5% Mg alloy produced by the same technique and which exhibits the same mechanical behavior. |
doi_str_mv | 10.1016/0956-7151(93)90110-E |
format | article |
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The ultrafine microstructure is produced by a high plastic torsional straining. Transmission electron microscopy, X-ray diffraction and differential scanning calorimetry are used to characterize the microstructural evolution and microhardness is used to determine mechanical behavior. The as-deformed microstructure exhibits an almost fully disordered crystalline structure with coherent domain size of about 18 nm, a strong torsional texture and high internal elastic strains. On annealing the as-deformed samples at different temperatures, the recrystallization of the material into a granular type structure containing non-equilibrium grain boundaries is first observed. This is followed by the transformation from non-equilibrium into equilibrium grain boundaries with simultaneous grain growth. This transformation is correlated with an increase of hardness. A new concept of non-equilibrium grain boundaries transparency is presented to interpret this singular behavior. 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The ultrafine microstructure is produced by a high plastic torsional straining. Transmission electron microscopy, X-ray diffraction and differential scanning calorimetry are used to characterize the microstructural evolution and microhardness is used to determine mechanical behavior. The as-deformed microstructure exhibits an almost fully disordered crystalline structure with coherent domain size of about 18 nm, a strong torsional texture and high internal elastic strains. On annealing the as-deformed samples at different temperatures, the recrystallization of the material into a granular type structure containing non-equilibrium grain boundaries is first observed. This is followed by the transformation from non-equilibrium into equilibrium grain boundaries with simultaneous grain growth. This transformation is correlated with an increase of hardness. A new concept of non-equilibrium grain boundaries transparency is presented to interpret this singular behavior. 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The ultrafine microstructure is produced by a high plastic torsional straining. Transmission electron microscopy, X-ray diffraction and differential scanning calorimetry are used to characterize the microstructural evolution and microhardness is used to determine mechanical behavior. The as-deformed microstructure exhibits an almost fully disordered crystalline structure with coherent domain size of about 18 nm, a strong torsional texture and high internal elastic strains. On annealing the as-deformed samples at different temperatures, the recrystallization of the material into a granular type structure containing non-equilibrium grain boundaries is first observed. This is followed by the transformation from non-equilibrium into equilibrium grain boundaries with simultaneous grain growth. This transformation is correlated with an increase of hardness. A new concept of non-equilibrium grain boundaries transparency is presented to interpret this singular behavior. The results are compared to those obtained on an ultrafine-grained Al-1.5% Mg alloy produced by the same technique and which exhibits the same mechanical behavior.</abstract><cop>United States</cop><doi>10.1016/0956-7151(93)90110-E</doi></addata></record> |
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subjects | 360102 - Metals & Alloys- Structure & Phase Studies 360103 - Metals & Alloys- Mechanical Properties ALLOY SYSTEMS ALLOYS ALUMINIUM ALLOYS BINARY ALLOY SYSTEMS CALORIMETRY COHERENT SCATTERING DEFORMATION DIFFRACTION ELECTRON MICROSCOPY HARDNESS INTERMETALLIC COMPOUNDS MATERIALS SCIENCE MECHANICAL PROPERTIES MICROSCOPY MICROSTRUCTURE NICKEL ALLOYS NICKEL BASE ALLOYS RECRYSTALLIZATION SCATTERING STRAINS TEXTURE TRANSMISSION ELECTRON MICROSCOPY X-RAY DIFFRACTION |
title | Microstructures and hardness of ultrafine-grained Ni[sub 3]Al |
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