Origins of strengthening and failure in twinned Au nanowires: Insights from in−situ experiments and atomistic simulations

Xie Z, Shin J, Renner J, Prakash A, Gianola DS, Bitzek E (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Acta Materialia Elsevier

Book Volume: 187

Pages Range: 166-175

DOI: 10.1016/j.actamat.2020.01.038

Abstract

The deformation behavior of ⟨110⟩-oriented twinned Au nanowires (NWs) with multiple longitudinal coherent twin boundaries (CTBs) under tension is studied using in−situ experiments and molecular dynamics (MD) simulations. The twinned NWs show higher yield strength than the single-crystalline NWs with similar diameter. Postmortem observations using electron microscopy and MD simulations show that the presence of CTBs transitions the governing mechanism from twinning-mediated deformation in single-crystalline NWs to strongly localized deformation. MD simulations reveal that the intersection of deposited partial dislocations at the CTB with the free surfaces plays an important role in the transmission of the dislocation, leading to the formation of full dislocations instead of partial dislocations and twinning in the case of single-crystalline NWs. The repeated activation of full dislocation slip leading to localized deformation is furthermore dependent on the relative orientation of surface facets to the activated Burgers vectors. The results of this work enhance the understanding of deformation mechanisms of twinned nano-objects and suggest design strategies for mechanical systems at the nanoscale.

Authors with CRIS profile

Zhuocheng Xie Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Jakob Renner Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Aruna Prakash Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Erik Bitzek Professur für Datenbasierte Materialmodellierung

Additional Organisation(s)

Professur für Datenbasierte Materialmodellierung Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

Plastic deformation, crack nucleation and fracture in lightweight intermetallic composite materials (EXC315 EAM (A3-7)) Exzellenz-Cluster Engineering of Advanced Materials Nov. 1, 2007 - Oct. 31, 2017

Involved external institutions

University of California US United States (USA) (US)

How to cite

APA:

Xie, Z., Shin, J., Renner, J., Prakash, A., Gianola, D.S., & Bitzek, E. (2020). Origins of strengthening and failure in twinned Au nanowires: Insights from in−situ experiments and atomistic simulations. Acta Materialia, 187, 166-175. https://dx.doi.org/10.1016/j.actamat.2020.01.038

MLA:

Xie, Zhuocheng, et al. "Origins of strengthening and failure in twinned Au nanowires: Insights from in−situ experiments and atomistic simulations." Acta Materialia 187 (2020): 166-175.

BibTeX: Download