TY - JOUR
T1 - Evolution of residual stress and interface coherency and their impact on deformation mechanisms in Al/Ti multilayers
AU - Wang, Wenbo
AU - Izadi, Sina
AU - Mraied, Hesham
AU - Deng, Chuang
AU - Cai, Wenjun
N1 - Publisher Copyright:
© The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2023.
PY - 2024/3
Y1 - 2024/3
N2 - Hardness of nanostructured metallic multilayers (NMMs) are often understood from their dependence on individual layer thickness (h), yet little is known about the impacts exerted by other microstructural factors. In this work, the effects of residual stress and interface coherency on the deformation mechanisms of Al/Ti NMMs with h = 2.5–52 nm were studied via experiments and molecular dynamics simulations. The residual stress was found to be tensile in Ti layers and compressive in Al layers in general, both of which tended to increase with decreasing h. Tensile stress of more than 2 GPa were measured in the Ti layers at h < 10 nm. Such high stress was related to the more coherent interfaces at small h, as confirmed by transmission electron microscopy analysis. Finally, molecular dynamics simulations showed that at h = 2.5 nm, the coherent interfaces were more effective barriers to dislocation initiation and transfer than the incoherent ones.
AB - Hardness of nanostructured metallic multilayers (NMMs) are often understood from their dependence on individual layer thickness (h), yet little is known about the impacts exerted by other microstructural factors. In this work, the effects of residual stress and interface coherency on the deformation mechanisms of Al/Ti NMMs with h = 2.5–52 nm were studied via experiments and molecular dynamics simulations. The residual stress was found to be tensile in Ti layers and compressive in Al layers in general, both of which tended to increase with decreasing h. Tensile stress of more than 2 GPa were measured in the Ti layers at h < 10 nm. Such high stress was related to the more coherent interfaces at small h, as confirmed by transmission electron microscopy analysis. Finally, molecular dynamics simulations showed that at h = 2.5 nm, the coherent interfaces were more effective barriers to dislocation initiation and transfer than the incoherent ones.
UR - http://www.scopus.com/inward/record.url?scp=85170363082&partnerID=8YFLogxK
U2 - 10.1007/s10853-023-08908-3
DO - 10.1007/s10853-023-08908-3
M3 - Article
AN - SCOPUS:85170363082
SN - 0022-2461
VL - 59
SP - 4748
EP - 4758
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 12
ER -