Medium-range order dictates local hardness in bulk metallic glasses
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In: Materials today, Vol. 44.2021, No. April, 04.2021, p. 48-57.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Medium-range order dictates local hardness in bulk metallic glasses
AU - Nomoto, Keita
AU - Ceguerra, Anna V.
AU - Gammer, Christoph
AU - Li, Bosong
AU - Bilal, Huma
AU - Hohenwarter, Anton
AU - Gludovatz, Bernd
AU - Eckert, Jürgen
AU - Ringer, Simon P.
AU - Kruzic, Jamie J.
N1 - Publisher Copyright: © 2020 Elsevier Ltd
PY - 2021/4
Y1 - 2021/4
N2 - Bulk metallic glasses (BMGs) are materials with outstanding strength and elastic properties that make them tantalizing for engineering applications, yet our poor understanding of how their amorphous atomic arrangements control their broader mechanical properties (hardness, wear, fracture, etc.) impedes our ability to apply materials science principles in their design. In this work, we uncover the hierarchical structure that exists in BMGs across the nano- to microscale by using nanobeam electron diffraction experiments. Our findings reveal that local hardness of microscale domains decreases with increasing size and volume fraction of atomic clusters with higher local medium range order (MRO). Furthermore, we propose a model of ductile phase softening that will enable the future design of BMGs by tuning the MRO size and distribution in the nanostructure.
AB - Bulk metallic glasses (BMGs) are materials with outstanding strength and elastic properties that make them tantalizing for engineering applications, yet our poor understanding of how their amorphous atomic arrangements control their broader mechanical properties (hardness, wear, fracture, etc.) impedes our ability to apply materials science principles in their design. In this work, we uncover the hierarchical structure that exists in BMGs across the nano- to microscale by using nanobeam electron diffraction experiments. Our findings reveal that local hardness of microscale domains decreases with increasing size and volume fraction of atomic clusters with higher local medium range order (MRO). Furthermore, we propose a model of ductile phase softening that will enable the future design of BMGs by tuning the MRO size and distribution in the nanostructure.
UR - http://www.scopus.com/inward/record.url?scp=85099304796&partnerID=8YFLogxK
U2 - 10.1016/j.mattod.2020.10.032
DO - 10.1016/j.mattod.2020.10.032
M3 - Article
AN - SCOPUS:85099304796
VL - 44.2021
SP - 48
EP - 57
JO - Materials today
JF - Materials today
SN - 1369-7021
IS - April
ER -
