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Deformation and Cracking in Ge–Sb–Se Chalcogenide Glasses During Indentation
Author(s) -
Varshneya Arun K.,
Mauro Daniel J.,
Rangarajan Badri,
Bowden Bradley F.
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01365.x
Subject(s) - brinell scale , materials science , indentation , composite material , borosilicate glass , cracking , ternary operation , elastic modulus , deformation (meteorology) , brittleness , chalcogenide , nanoindentation , vickers hardness test , mineralogy , metallurgy , geology , microstructure , alloy , computer science , programming language
Deformation and cracking behavior of Ge–Sb–Se binary and ternary chalcogenide glasses of varying average covalent coordination number, 〈 r 〉, was studied by indenting with Vickers and Brinell microindenters using static and recording machines, and subsequent analysis using a non‐contact profilometer. Vickers‐produced cracks were the smallest around the GeSe 4 composition (〈 r 〉=2.4) after unloading, hence the indentation toughness was a maximum and the brittleness a minimum at 〈 r 〉=2.4. Brinell‐created pond (crater) depth, the mound (pile‐up) height, and the radial fractures originating from the mounds displayed minima in the binaries, presumably due to maximized elastic recovery around 〈 r 〉=2.4. Consequently, Brinell hardness computed from the unloaded depth ( H BD ) showed a maximum around GeSe 4 . The maximized elastic recovery around GeSe 4 is consistent with Phillips' optimized connectivity arguments. GeSe 4 resembles the “anomalous” SiO 2 glass for deformation and cracking behavior. Surprisingly, many of the extrema were nearly non‐existent in the ternary glasses. The apparent contrast to the binary glasses is not understood.