A Nanoindentation Study of the Plastic Deformation and Fracture Mechanisms in Single-Crystalline CaFe2As2

Frawley, Keara G.; Bakst, Ian; Sypek, John T.; Vijayan, Sriram; Weinberger, Christopher R.; Canfield, Paul C.; Aindow, Mark; Lee, Seok -Woo

doi:10.1007/s11837-018-2851-y

A Nanoindentation Study of the Plastic Deformation and Fracture Mechanisms in Single-Crystalline CaFe₂As₂

Journal Article · Tue Apr 10 00:00:00 EDT 2018 · JOM. Journal of the Minerals, Metals & Materials Society

DOI:https://doi.org/10.1007/s11837-018-2851-y· OSTI ID:1441005

Frawley, Keara G. ^[1]; Bakst, Ian ^[2]; Sypek, John T. ^[1]; Vijayan, Sriram ^[1]; Weinberger, Christopher R. ^[2]; Canfield, Paul C. ^[3]; Aindow, Mark ^[1]; ^[1]

Univ. of Connecticut, Storrs, CT (United States)
Colorado State Univ., Fort Collins, CO (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States)

In this paper, the plastic deformation and fracture mechanisms in single-crystalline CaFe₂As₂ has been studied using nanoindentation and density functional theory simulations. CaFe₂As₂ single crystals were grown in a Sn-flux, resulting in homogeneous and nearly defect-free crystals. Nanoindentation along the [001] direction produces strain bursts, radial cracking, and lateral cracking. Ideal cleavage simulations along the [001] and [100] directions using density functional theory calculations revealed that cleavage along the [001] direction requires a much lower stress than cleavage along the [100] direction. This strong anisotropy of cleavage strength implies that CaFe₂As₂ has an atomic-scale layered structure, which typically exhibits lateral cracking during nanoindentation. This special layered structure results from weak atomic bonding between the (001) Ca and Fe₂As₂ layers.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1441005

Report Number(s):: IS-J--9667; PII: 2851

Journal Information:: JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 7 Vol. 70; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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