Microstructure evolution in plasticity

Deformation of polycrystalline metallic materials induces intrinsic formation and evolution of various types of microstructures at different length scales due to different underlying physical mechanisms affecting the plasticity, damage and fracture behavior. At nanomicro scale metals under irradiation develop certain zones free from irradiation and localization occurs in these areas as so-called clear bands affecting the ductility and the failure of the material. At meso scale dislocations form various dislocation cell structures induced by the deformation. At grain level polycrystalline materials develop stress and strain localization around the grain boundaries which could lead to inter-granular cracking e.g. through stress corrosion cracking. These are some examples to illustrate the influence of the microstructure on the global behavior of materials. In this context, the current work addresses different microstructure formation examples, focusing especially on the inter-granular deformation localization, through a strain gradient crystal plasticity framework and links it to different failure mechanisms.
24th International Congress of Theoretical and Applied Mechanic ICTAM (2016)


The structure of turbulent flow in an open channel bend of strong curvature with deformed bed: Insight provided by detached eddy simulation
Constantinescu, George; Köken, Mete; Zeng, Jie (American Geophysical Union (AGU), 2011-05-12)
[1] Results of a detached eddy simulation (DES) are used to better understand the effects of the mean flow three-dimensionality and secondary currents on turbulence and boundary shear stresses and the mechanisms through which the momentum and Reynolds stresses are redistributed in a strongly curved 193 degrees bend with fixed deformed bed corresponding to the later stages of the erosion and sedimentation process. The ratio between the radius of curvature of the curved reach and the channel width is close to...
Micromechanical characterization of metallic glass — crystalline nanocomposite coatings
Abboud, Mohammad; Özerinç, Sezer; Kalay, Yunus Eren; Department of Micro and Nanotechnology (2018)
Amorphous/crystalline nanolayers provide an effective model system to study the mechanical behavior and size effects of metallic glasses and crystalline metals in confined geometries. They also provide an advantageous structure for improving the ductility of amorphous metals while maintaining their outstanding strength. Combination of high strength and ductility make these nanocomposites promising materials as wear resistant coatings. The structure-property relationship in Amorphous/Crystalline nanolayers c...
Inter-granular Microstructure Formation and Evolution Through Crystal Plasticity
Yalçınkaya, Tuncay (2016-07-24)
Deformation of polycrystalline materials induce intra–granular, inter–granular and trans–granular deformation localization which results in spatially heterogeneous strain and stress distribution affecting the plasticity, damage and fracture of the material. Inter–granular localization is the most common mechanism considering the grain boundaries are natural locations triggering accumulation of the plastic slip and the geometrically necessary dislocations which accommodate the gradients of the inhomogeneous ...
Microstructural origins of strain heterogeneity in formability of aluminum alloys
Güler, Bara; Efe, Mert; Department of Metallurgical and Materials Engineering (2019)
In forming of sheet metals, strain localizations and subsequent necking are generally induced by geometrical imperfections, such as local thickness variations. Microstructural heterogeneities also take role in strain localizations, yet their influence is neglected when concerning the macro-scale formability. This thesis investigated the effects of microstructural features on the strain localization behavior of aluminum alloys. A small-scale biaxial test device and sample were utilized for this purpose. The ...
Microstructural and texture evolution during thermo-hydrogen processing of Ti6Al4V alloys produced by electron beam melting
Dogu, Merve Nur; ESEN, ZİYA; Davut, Kemal; Tan, Evren; Gumus, Berkay; Dericioğlu, Arcan Fehmi (Elsevier BV, 2020-10-01)
The present study was conducted to reveal the effects of building angles and post heat-treatments (2-step Thermo-Hydrogen Processing (THP) and conventional annealing treatment) on the density, microstructure and texture of Ti6Al4V alloy parts produced by Electron Beam Melting (EBM). The results showed that regardless of the building angle; the density, microstructure and crystallographic texture (defined with respect to building angle) of the as-produced samples were identical; having Widmanstatten a struct...
Citation Formats
T. Yalçınkaya, “Microstructure evolution in plasticity,” Montreal, Canada, 2016, vol. 3, p. 2512, Accessed: 00, 2021. [Online]. Available: http://www.ictam2016.org/welcome_e.shtml.