Competing mechanisms between dislocation and phase transformation in plastic deformation of single crystalline yttria-stabilized tetragonal zirconia nanopillars

Citation data:

Acta Materialia, ISSN: 1359-6454, Vol: 120, Page: 337-347

Publication Year:
2016
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Repository URL:
http://scholarsmine.mst.edu/matsci_eng_facwork/1559; https://works.bepress.com/mohsenzaeem/85; http://arxiv.org/abs/1607.03141
DOI:
10.1016/j.actamat.2016.08.075
Author(s):
Zhang, Ning; Asle Zaeem, Mohsen
Publisher(s):
Elsevier BV; Elsevier Ltd
Tags:
Materials Science; Crystalline Materials; Dislocations (Crystals); Molecular Dynamics; Nanostructures; Phase Transitions; Plastic Deformation; Yttria Stabilized Zirconia; Yttrium Alloys; Competing Mechanisms; Compressive Loading; Crystallographic Orientations; Plastic Deformation Mechanisms; Single-Crystalline; Tetragonal to Monoclinic Phase Transformations; Uni-Axial Compression; Yttria Stabilized Tetragonal Zirconias; Zirconia; Crystalline Materials; Dislocations (Crystals); Molecular Dynamics; Nanostructures; Phase Transitions; Plastic Deformation; Yttria Stabilized Zirconia; Yttrium Alloys; Competing Mechanisms; Compressive Loading; Crystallographic Orientations; Plastic Deformation Mechanisms; Single-Crystalline; Tetragonal to Monoclinic Phase Transformations; Uni-Axial Compression; Yttria Stabilized Tetragonal Zirconias; Zirconia; Condensed Matter - Materials Science; Materials Science and Engineering; Numerical Analysis and Scientific Computing
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article description
Molecular dynamics (MD) is employed to investigate the plastic deformation mechanisms of single crystalline yttria-stabilized tetragonal zirconia (YSTZ) nanopillars under uniaxial compression. Simulation results show that the nanoscale plastic deformation of YSTZ is strongly dependent on the crystallographic orientation of zirconia nanopillars. For the first time, the experimental explored tetragonal to monoclinic phase transformation is reproduced by MD simulations in some particular loading directions. Three distinct mechanisms of dislocation, phase transformation, and a combination of dislocation and phase transformation are identified when applying compressive loading along different directions. The strength of zirconia nanopillars exhibits a sensitive behavior depending on the failure mechanisms, such that the dislocation-mediated deformation leads to the lowest strength, while the phase transformation-dominated deformation results in the highest strength.