Controlling the distribution of structural heterogeneities in severely deformed metallic glass
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in: Materials Science and Engineering A, Jahrgang 752.2019, Nr. 3 April, 02.03.2019, S. 36-42.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Controlling the distribution of structural heterogeneities in severely deformed metallic glass
AU - Bian, X. L.
AU - Zhao, D.
AU - Kim, J. T.
AU - Sopu, Daniel
AU - Wang, Gang
AU - Pippan, Reinhard
AU - Eckert, Jürgen
PY - 2019/3/2
Y1 - 2019/3/2
N2 - To uncover the physical correlation between intrinsic structural heterogeneity and mechanical properties of metallic glasses, we performed high-pressure torsion (HPT) to tailor their microstructure with a rejuvenated state. Nanoindentation results show that the change of mechanical properties results from the convolution of the intrinsic thermal activation process and the structural inhomogeneity in the glassy phase. The spatial heterogeneity induced by severe plastic deformation can markedly operate to reduce the energy barrier for shear transformation zone (STZ) activation and increase the number of STZ events during tensile testing to accommodate the plastic strain, leading to a brittle-to-ductile transition. We highlight that by properly controlling the distribution of structural heterogeneities, one can purposely tune the mechanical performance of metallic glasses.
AB - To uncover the physical correlation between intrinsic structural heterogeneity and mechanical properties of metallic glasses, we performed high-pressure torsion (HPT) to tailor their microstructure with a rejuvenated state. Nanoindentation results show that the change of mechanical properties results from the convolution of the intrinsic thermal activation process and the structural inhomogeneity in the glassy phase. The spatial heterogeneity induced by severe plastic deformation can markedly operate to reduce the energy barrier for shear transformation zone (STZ) activation and increase the number of STZ events during tensile testing to accommodate the plastic strain, leading to a brittle-to-ductile transition. We highlight that by properly controlling the distribution of structural heterogeneities, one can purposely tune the mechanical performance of metallic glasses.
UR - http://www.scopus.com/inward/record.url?scp=85062393602&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2019.02.092
DO - 10.1016/j.msea.2019.02.092
M3 - Article
VL - 752.2019
SP - 36
EP - 42
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
SN - 0921-5093
IS - 3 April
ER -
