Crystal plasticity finite element analysis of twist extrusion processes

Şimşek, Ülke
Yalçınkaya, Tuncay
2nd International Workshop on Plasticity, Damage and Fracture of Engineering Materials


Crystal plasticity based analysis of crack propagation at microscale by extended finite element method
Yılmaz, Umut; Darendeliler, Haluk; Department of Mechanical Engineering (2023-1-27)
Crack propagation is conventionally treated by employing analytical methods at macroscale. Investigation of the relations between the crack propagation, dislocation movement and the crystalline grain properties in the material microscale provides better understanding of the crack propagation mechanism. In this work, the crystal plasticity constitutive model is incorporated to a commercial finite element software as an user-defined subroutine to simulate crack propagation in the material microscale. The effe...
Crystal plasticity modeling of additively manufactured metallic microstructures
Acar, Sadik Sefa; Bulut, Orhun; Yalçınkaya, Tuncay (2021-01-01)
Different manufacturing processes such as flow forming, rolling, wire drawing and additive manufacturing induce anisotropic grain structure and texture evolution at the micro scale, which results in macroscopic anisotropic plastic behavior. Among these microstructures, development of columnar grain structure is quite common especially in additively manufactured metallic materials. A systematic micromechanical analysis is necessary to evaluate the influence of both grain morphology and texture (orientation a...
Crystallization behavior in a highly driven marginal glass forming alloy
Kalay, Yunus Eren; ANDERSON, I. E. (Elsevier BV, 2008-05-15)
Al90Sm10, a marginal glass former, was rapidly solidified using Cu-block single roller melt spinning at wheel speeds of 30 and 40 m/s. The product phases of rapid solidification were identified and analyzed using high energy synchrotron X-ray diffraction (HEXRD), high resolution transmission electron microscopy, and atom probe tomography. The as-quenched structure consists of a saturated amorphous phase and nanocrystalline Al with typical length scale of about 5 nm. The appearance of a pre-peak on HEXRD dif...
Crystal data, photoconductivity and carrier scattering mechanisms in CuIn5S8 single crystals
Qasrawi, AF; Hasanlı, Nızamı (Wiley, 2001-01-01)
The X-ray diffraction has revealed that CuIn5S8 is a single phase crystal of cubic spinet structure. The value of the unit cell parameter for this crystal is 1.06736 nm. The crystal is assigned to the conventional space group Fd3m. The photocurrent is found to have the characteristic of monomolecular and bimolecular recombination at low and high illumination intensities, respectively. The electrical resistivity and Hall effect of CuIn5S8 crystals are measured in the temperature range of 50-400 K. The crysta...
Crystal orientation relationships in ternary eutectic Al-Al2Cu-Ag2Al
Steinmetz, Philipp; Dennstedt, Anne; ŞEREFOĞLU KAYA, MELİS; Sargın, Irmak; Genau, Amber; Hecht, Ulrike (2018-09-01)
The microstructure of ternary eutectic Al-Al2Cu-Ag2Al arranges in several patterns of three solid phases during directional solidification. One key question for understanding the behavior of this system is if and how the patterns depend on crystal orientation relationships (ORs) between the solid phases. In order to study the correlation between the ORs and the evolving patterns for different process conditions, electron backscatter diffraction (EBSD) is performed on samples of directionally solidified tern...
Citation Formats
Ü. Şimşek and T. Yalçınkaya, “Crystal plasticity finite element analysis of twist extrusion processes,” presented at the 2nd International Workshop on Plasticity, Damage and Fracture of Engineering Materials, Ankara, Türkiye, 2021, Accessed: 00, 2022. [Online]. Available: