Lee Hsun Lecture Series
Topic: Deformation twinning at the intermediate scale
Speaker: Prof. Irene J. Beyerlein
UC Santa Barbara
Time: 10:00-11:30 am, May 25th, 2017
Venue: Room 403，Shi Changxu Building, IMR CAS
Welcome to attend！
Abstract:
At temperatures below those at which individual atoms move by diffusion, slip and twinning are the major deformation modes that enable a metal to change shape under an externally applied strain field. Twinning is especially important in crystals of lower symmetry, for example, hexagonal close packed (HCP) metals, such as Mg, Zr, Ti, and Be, and their alloys. The formation of deformation twins in this class of metals is a multiscale event, and can be divided into nucleation, propagation, and growth stages. In this lecture, we present a series of recent experimental and modeling studies that aim to obtain a physical picture of deformation twinning at intermediate scales, where the structure of groups of defects, crystals, and grain boundaries play a profound role. We will report on findings regarding twin embryo formation, twin lamella thickening and multiplication, and twin transmission across grain boundaries. Some interesting effects of plastic anisotropy in slip and local crystal neighborhoods will be discussed.
IRENE J. BEYERLEIN
Department of Mechanical Engineering, Materials Department,
University of California, Santa Barbara CA 93106-5050
email: beyerlein@engineering.ucsb.edu
(a) Professional Preparation:
(b) Appointments:
(c) Products i: 5 publications relevant to the proposal (total over 260):
[1] M. Lentz, M. Risse, N. Schaefer, W. Reimers, and I.J. Beyerlein, “Strength and ductility with {1011}-{1012} double twinning in a magnesium alloy” Nature Communications, 7 (2016) 11068.
[2] I. J. Beyerlein and J. R. Mayeur, “Mesoscale investigations for the evolution of interfaces in plasticity”, Current Opinion in Solid State & Materials Science, 19 (2015) 203-211.
[3] I. J. Beyerlein, M. J. Demkowicz, A. Misra, and B. P. Uberuaga, “Defect-Interface Interactions”, Progress in Materials Science, 74 (2015) 125-210.
[4] J. R. Mayeur, I. J. Beyerlein, C. A. Bronkhorst, and H. M. Mourad, “Incorporating interface affected zones into crystal plasticity”, International Journal of Plasticity, 65 (2015) 206-225.
[5] I. J. Beyerlein, J. R. Mayeur, S. J. Zheng, N. A. Mara, J. Wang, and A. Misra, “Emergence of table interfaces under extreme plastic deformation”, Proc National Academy of Sciences, 111 (2014) 4386-4390.
(c) Products ii: 5 other publications:
[1] W. Z. Han, M. J. Demkowicz, N. A. Mara, E. Fu, S. Sinha, A. D. Rollett, Y. Wang, J. S. Carpenter, I. J. Beyerlein, and A. Misra, “Design of radiation tolerant materials via interface engineering”, Advanced Materials, 25 (2013) 6975-6979.
[2] I. J. Beyerlein, J.A. Caro, M. J. Demkowicz, N.A. Mara, A. Misra, and B. P. Uberuaga, “Radiation-Damage-Tolerant Nanomaterials”, Materials Today, 16 (2013) 443-449.
[3] S. J. Zheng, I.J. Beyerlein, J. S. Carpenter, K. Kang, J. Wang, W. Z. Han, and N. A. Mara. “High strength and thermally stable bulk nanolayered composites due to twin-induced interfaces”, Nature Communications 4 (2013) 1696.
[4] I. J. Beyerlein, J. Wang, and R. F. Zhang, "Interface-dependent nucleation in nanostructured layered composites", Appl. Phys. Lett. Materials, 1 (2013) 032112.
[5] I. J. Beyerlein and C. N. Tomé, “A probabilistic twin nucleation model for hcp polycrystalline metals” Proc. Royal Soc. A 466 (2010) 2517-2544.
(d) Synergistic activities:
2014–present: Editor, Acta Materialia
2014–present: Editor, Scripta Materialia
2011–present: Associate Editor, Journal of Engineering Materials and Technology (American Society for Mechanical Engineers).
2008–present: Advisory Board Member, International Journal of Plasticity.
2004–present: Editorial Board Member, Modeling and Simulation in Materials Science and Engineering.
2016: National Science Foundation STEM ADVANCE scholarship, University of New Hampshire
2013: Los Alamos National Laboratory Distinguished Postdoc Mentor Award
2013: International Journal of Plasticity Young Researcher Award
2012: Los Alamos National Laboratory Fellow’s Prize for Research
