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Crystal plasticity analysis of texture development in magnesium alloy during extrusion |
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| Authors: | Tsuyoshi Mayama Masafumi NodaRyoichi Chiba Mitsutoshi Kuroda |
| Institution: | a Priority Organization for Innovation and Excellence, Kumamoto University, 2-39-1, Kurokami, Kumamoto 860-8555, Japan b Department of Mechanical Science and Engineering, Chiba Institute of Technology, Tsudanuma 2-17-1, Narashino, Chiba 275-0016, Japan c Mechanical Systems Engineering, Asahikawa National College of Technology, Shunkodai 2-2-1-6, Asahikawa, Hokkaido 071-8142, Japan d Mechanical Systems Engineering, Yamagata University, Jonan 4-3-16, Yonezawa, Yamagata 992-8510, Japan |
| Abstract: | The texture development mechanism during the extrusion of magnesium alloy is investigated by experimental observation and numerical analysis. First, we perform a finite element analysis of a full extrusion process using a phenomenological constitutive equation, and it is confirmed that the loading condition of the extrusion process near the central axis of the billet is approximated by an equi-biaxial compression mode. Then, the equi-biaxial compression problem is adopted as a simplified boundary value problem to be solved using a crystal plasticity model to clarify the detailed texture development mechanism during the extrusion process. The crystal plasticity analysis of equi-biaxial compression successfully reproduces the texture development from an initial random texture to the final experimentally observed texture. The effects of the deformation modes (i.e. slip and twinning systems) implemented in the calculation and the reference stress ratio of basal to nonbasal slip systems on texture development are studied in detail. Finally, the mechanism of texture development during the extrusion process is discussed in terms of the lattice rotation caused by the activated slip systems. |
| Keywords: | Magnesium Texture Crystal plasticity Finite element analysis Twinning |
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