Residual stresses and microstructural evolution of ECAPed AA2017
TypeArticles dans des revues avec comité de lecture
The mechanical behavior and microstructural evolution of an AA2017 aluminum alloy processed by ECAP with an equivalent simple shear deformation of ∼6 at 200 °C were studied. Samples were characterized by means of scanning electron microscopy (SEM-EDS- EBSD), image-assisted by focus ion beam (FIB), Vickers microhardness and X-ray diffraction (XRD) techniques. During the deformation process, the Al 2 Cu precipitates did not get fragmented or re-absorbed in the Al matrix. After the first ECAP pass, at least 50% of grains displayed an ultrafine size. The EBSD analysis showed an increment of the misorientation angle immediately after the first ECAP pass. The macrotexture evolution was explained in terms of the formation of f1: A 1θ ∗ , A θ , Ā θ , A 2θ ∗ , f2: C θ , B¯ θ , B θ , Ā θ , A θ , A 1θ ∗ and f3: C θ , B θ , B¯ θ , A θ , Ā θ , A 2θ ∗ fibers. The macro-residual stress measurements of the highly deformed samples showed linear sin 2 ψ profiles. The micro and macro-residual stresses were compatible with dislocation rearrangement, in which the annihilation and formation were in quasi-equilibrium. It was found that the highest microhardness value (1176 MPa) and grain refinement (at least 20% of grains showed a size smaller than 100 μm 2 ) appeared after the first extrusion pass. The decrease in hardness, after the second pass and the residual stress stability, could be associated to a dynamic recovery phenomenon.
Files in this item
Showing items related by title, author, creator and subject.
RUIZ, Carlos Reyes; FIGUEROA, Ignacio A.; BRAHAM, Chedly; CABRERA, José M.; ISMELI, Alfonso; GONZALEZ, Gonzalo (Japan Institute of Metals and Materials, 2015)Equal channel angular pressing (ECAP) is a severe plastic deformation (SPD) technique that produces nanostructured materials. Based on a remarkable grain size reduction, this process has led to improve mechanical properties, ...
Microstructure and Texture of Al2SixSn (x = 0, 4, 8 mass%) Alloys Processed by Equal Channel Angular Pressing GONZALEZ, Gonzalo; BRAHAM, Chedly; LEBRUN, Jean-Lou; CHASTEL, Yvan; SEILER, Wilfrid; FIGUEROA, Ignacio A. (Japan Institute of Metals, 2012)The influence of Sn on the microstructure, microstrain and grain morphology in Al–2Si–xSn samples processed by ECAP is reported and discussed. The pseudo-binary Al–xSn alloys (where x = 0, 4, 8 mass%) were produced by ...
Effect of electro discharge machining (EDM) on the AISI316L SS white layer microstructure and corrosion resistance SIDHOM, Habib; GHANEM, Farhat; AMADOU, Tidiane; GONZALEZ, Gonzalo; BRAHAM, Chedly (Springer, 2013)The localised corrosion resistance of austenitic stainless steels is strongly influenced by the quality of finished surface. EDM machining induces substantial changes by the high thermal gradients generated by electric ...
Microstructure and texture evolution of the Al-20sn alloy processed by equal-channel angular pressing using route C HERNÁNDEZ, Cristopher L.; FIGUEROA, Ignacio A.; LÓPEZ, Ismeli Alfonso; BRAHAM, Chedly; CASTILLO, Patricia; GONZÁLEZ, Gonzalo (Japan Institute of Metals (JIM), 2014)In this work, the microstructure and texture evolution of an Al-20Sn (mass%) alloy processed by Equal Channel Angular Pressing is presented. The evolution of dislocation cells into subgrains and the mechanical response of ...
Fatigue crack initiation and growth on a steel in the very high cycle regime with sea water corrosion PALIN-LUC, Thierry; PÉREZ-MORA, Ruben; BATHIAS, Claude; DOMINGUEZ, Gonzalo; PARIS, Paul C.; ARANA, Jose Luis (Elsevier, 2010)This paper is devoted to the effect of corrosion on the gigacycle fatigue strength of a martensitic–bainitic hot rolled steel used for manufacturing offshore mooring chains for petroleum platforms. Smooth specimens were ...