Morphology of cracks and shear bands in polymer-supported thin film metallic glasses
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In: Materials Today Communications, Vol. 28.2021, No. September, 102547, 09.2021.
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TY - JOUR
T1 - Morphology of cracks and shear bands in polymer-supported thin film metallic glasses
AU - Glushko, Oleksandr
AU - Gammer, Christoph
AU - Weniger, Lisa-Marie
AU - Sheng, Huaping
AU - Mitterer, Christian
AU - Eckert, Jürgen
N1 - Publisher Copyright: © 2021
PY - 2021/9
Y1 - 2021/9
N2 - Here we provide a systematic study of tensile deformation mechanisms in PdSi metallic glasses employing polymer-supported sputter deposited films. Due to the polymer substrate, global strain localization within one critical shear band is inhibited and thus thousands of different shear bands and cracks can be examined within a single tensile sample. Two distinctly different types of shear bands, allowed by the sample geometry, are observed and analyzed. It is shown that crack formation occurs through activation of multiple out-of-plane shear bands leading to local plasticity and neck-like shape of crack edges. The in-plane shear bands, which appear at higher applied strains, typically do not lead to crack formation and can accommodate both applied tensile strain and transverse compressive strain. The mechanism of effective strain hardening through de-activation of in-plane shear bands is demonstrated by means of quasi-in-situ studies. Shear banding is shown to be the fundamental deformation mechanism for different film thicknesses ranging from 25 to 1000 nm. Polymer-supported films represent a unique model material system which enables easy characterization of the tensile behavior of metallic glasses and provides an opportunity to gain new insights into the fundamental mechanisms of shear banding.
AB - Here we provide a systematic study of tensile deformation mechanisms in PdSi metallic glasses employing polymer-supported sputter deposited films. Due to the polymer substrate, global strain localization within one critical shear band is inhibited and thus thousands of different shear bands and cracks can be examined within a single tensile sample. Two distinctly different types of shear bands, allowed by the sample geometry, are observed and analyzed. It is shown that crack formation occurs through activation of multiple out-of-plane shear bands leading to local plasticity and neck-like shape of crack edges. The in-plane shear bands, which appear at higher applied strains, typically do not lead to crack formation and can accommodate both applied tensile strain and transverse compressive strain. The mechanism of effective strain hardening through de-activation of in-plane shear bands is demonstrated by means of quasi-in-situ studies. Shear banding is shown to be the fundamental deformation mechanism for different film thicknesses ranging from 25 to 1000 nm. Polymer-supported films represent a unique model material system which enables easy characterization of the tensile behavior of metallic glasses and provides an opportunity to gain new insights into the fundamental mechanisms of shear banding.
UR - http://www.scopus.com/inward/record.url?scp=85108375112&partnerID=8YFLogxK
U2 - 10.1016/j.mtcomm.2021.102547
DO - 10.1016/j.mtcomm.2021.102547
M3 - Article
VL - 28.2021
JO - Materials Today Communications
JF - Materials Today Communications
SN - 2352-4928
IS - September
M1 - 102547
ER -