Work

Self-organized columnar Zr0.7Ta0.3B1.5 core/shell-nanostructure thin films

Year: 2020

Type: article

Abstract: We recently showed that Zr1−xTaxBy thin films have columnar nanostructure in which column boundaries are B-rich for x < 0.2, while Ta-rich for x ≥ 0.2. Layers with x ≥ 0.2 exhibit higher hardness and, simultaneously, enhanced toughness. Here, we determine the atomic-scale nanostructure of sputter-deposited columnar Zr0.7Ta0.3B1.5 thin films. The columns, 95 ± 17 Å, are core/shell nanostructures in which 80 ± 15-Å cores are crystalline hexagonal-AlB2-structure Zr-rich stoichiometric Zr1−xTaxB2. The shell structure is a narrow dense, disordered region that is Ta-rich and highly B-deficient. The cores are formed under intense ion mixing via preferential Ta segregation, due to the lower formation enthalpy of TaB2 than ZrB2, in response to the chemical driving force to form a stoichiometric compound. The films with unique combination of nanosized crystalline cores and dense metallic-glass-like shells provide excellent mechanical properties.

Source: Surface and Coatings Technology

DOI: 10.1016/j.surfcoat.2020.126237

Authors: Babak Bakhit, Justinas Palisaitis, Per O.Å. Persson, Björn Alling, Johanna Rosen, Lars Hultman, Ivan Petrov, J.E. Greene, Grzegorz Greczynski

Institutions: Linköping University, National Taiwan University of Science and Technology, University of Illinois Urbana-Champaign

Language: English

Topic: Metal and Thin Film Mechanics

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,950

Funders: Stiftelsen för Strategisk Forskning, VINNOVA, Carl Tryggers Stiftelse för Vetenskaplig Forskning, Linköpings Universitet, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Uppsala Universitet, ÅForsk, Stiftelsen Åforsk, University of Illinois at Urbana-Champaign

Awards: G1005022168, G1359564889, G1696766764, G193668846, G2091841777, G2156986825, Novel Strategy for Low-Temperature High-Rate Deposition of Dense and Stress-free Refractory Thin Films; The Boride Opportunity, G3216485538, G3312411, G416557497, G4466992459, G4732377757, Understanding the emergence of large scale coherence in turbulent flows, G5115785472, G54318935, G5434537738, G5649509635, G5886853806, G5994267272, Materials design - New magnetic nanolaminates, superstructures, and ultrathin layers, from first principles and advanced thin film synthesis, G6482051867, G6495831551, A paradigm shift in thin film growth by magnetron sputtering: towards metal-ion-controlled process, G6732668590, Theory for Disoredered Magnetic Materials at High Temperature, G712881263, G7578213928, G806207984, Svenskt Centrum för jonstrålebaserad Materialanalys, G821004061, G823452614, G829065313, Strategiska utmaningar för beräkningsbaserad legeringsteori, G8650407843, G913268369

OpenAlex ID: W3045740094

FWCI: 1.656

Cites: 73

Cited by: 15

Related to: 10