The Investigation of Plastic Behavior by Discrete Dislocation Dynamics for Single Crystal Pillar at Submicron Scale

This thesis transports you to a wonderful and fascinating small-scale world and tells you the origin of several new phenomena. The investigative tool is the improved discrete dislocation-based multi-scale approaches, bridging the continuum modeling and atomistic simulation. Mechanism-based theoretical models are put forward to conveniently predict the mechanical responses and defect evolution. The findings presented in this thesis yield valuable new guidelines for microdevice design, reliability analysis and defect tuning.

Autorentext

Education:

Sep. 2005-Jul. 2009, BS in School of Material Science and Engineering, Shandong University

Sep. 2009-Jan. 2015, PhD in Department of Engineering Mechanics, Tsinghua University

Prizes and Awards:

[1] Excellent Doctoral Dissertation, Tsinghua University 2015

[2] "Gao Tian" Scholarship, Second Prize, Tsinghua University 2010,2014 (Twice)

[3] Youth Outstanding Paper Award, Beijing Society of Theoretical and Applied Mechanics, 2015

[4] Excellent graduates in Shandong Province, Shandong Province 2009

[5] Excellent student in Shandong Province, Shandong Province 2007,2008 (Twice) [6] National Scholarship, China 2007 [7] President Scholarship, Shandong University 2007

[8] Top Ten League Member, Shandong University 2007

[9] Prominent student in summer practice, Shandong University 2007

[10] Excellent student cadre, Shandong University 2006,2007,2008 (Thrice)

[11] Student Scholarship, First prize, Shandong University 2006,2007,2008 (Thrice)

Publications:

[1] YN Cui, ZL Liu, Z Zhuang. Theoretical and numerical investigations on confined plasticity in

micropillars. Journal of the Mechanics and Physics of Solids, 2015, 76: 127-143

[2] YN Cui, ZL Liu, ZJ Wang, Z Zhuang. Atypical dislocation behavior under low amplitude cyclic loading: experiment, simulation and theoretical model. Journal of the Mechanics and Physics of Solids, (accepted) [3] YN Cui, ZL Liu, Z Zhuang. Quantitative investigations on dislocation based discrete-continuous model

of crystal plasticity at submicron scale. International Journal of Plasticity , 2015, 69, 54-72 [4] YN Cui, P Lin, ZL Liu, Z Zhuang. Theoretical and numerical investigations of single arm dislocation source controlled plastic flow in FCC micropillars. International Journal of Plasticity, 2014, 55, 279-292

[5] YN Cui, ZL Liu, Z Zhuang. Dislocation Multiplication by Single Cross Slipfor FCC at Submicron Scales. Chinese Physics Letters, 2013, 30(4), 046103 [6] ZJ Wang, QJ Li, YN Cui, ZL Liu, E Ma, J Li, J Sun, Z Zhuang, M Dao, ZW Shan, S Suresh. Cyclic

deformation leads to defect healing and strengthening of small-volume metal crystals. Proceedings of the

National Academy of Sciences. 2015, 112(44) 13502-13507

[7] P Lin, ZL Liu, YN Cui, Z Zhuang. A stochastic crystal plasticity model with size-dependent and

intermittent strain bursts characteristics at micron scale. Heal submicron-sized Al single crystal through

low amplitude cyclic loading. International Journal of Solids and Structures, 2015, 69-70, 267-276

[8] JQ Hu, ZL Liu, YN Cui, ZJ Wang, ZW Shan, Z Zhuang. Sensitive material behavior: theoretical model

and experiment for compression collapse of gold particles at submicron scale, Journal of Applied

Mechanics, 2014, 81, 091007 [9] Z Zhuang, YN Cui, Y Gao, ZL Liu. Advances in discrete dislocation mechanism on submicro crystal atypical plasticity. Advances in Mechanics, 2011 (Chinese Journal)

[10] YN Cui, Y Gao, ZL Liu, Z Zhuang. Developing multi-scale model to study atypical crystal plastic

behavior, Advances in Heterogeneous Material Mechanics ICHMM-2011, DEStech Publications, 730-737.

(International conference)

[11] YN Cui, et al. Investigation of single arm source controlled plastic flow in FCC micropillar by discrete

dislocation dynamics and theoretical analysis. WCCM XI 2014 (International conference)