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dc.contributor.authorQiao, Jichao
dc.contributor.authorWang, Yun-Jiang
dc.contributor.authorZhao, L. Z.
dc.contributor.authorDai, L. H.
dc.contributor.authorCrespo Artiaga, Daniel
dc.contributor.authorPelletier, J. M.
dc.contributor.authorKeer, L. M.
dc.contributor.authorYao, Y
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationQiao, J., Wang, Y., Zhao, L., Dai, L., Crespo, D., Pelletier, J., Keer, L., Yao, Y. Transition from stress-driven to thermally activated stress relaxation in metallic glasses. "Physical review B", 21 Setembre 2016, vol. 94, núm. 10.
dc.description.abstractThe short-range ordered but long-range disordered structure of metallic glasses yields strong structural and dynamic heterogeneities. Stress relaxation is a technique to trace the evolution of stress in response to a fixed strain, which reflects the dynamic features phenomenologically described by the Kohlrausch-Williams-Watts (KWW) equation. The KWW equation describes a broad distribution of relaxation times with a small number of empirical parameters, but it does not arise from a particular physically motivated mechanistic picture. Here we report an anomalous two-stage stress relaxation behavior in a Cu46Zr46Al8 metallic glass over a wide temperature range and generalize the findings in other compositions. Thermodynamic analysis identifies two categories of processes: a fast stress-driven event with large activation volume and a slow thermally activated event with small activation volume, which synthetically dominates the stress relaxation dynamics. Discrete analyses rationalize the transition mechanism induced by stress and explain the anomalous variation of the KWW characteristic time with temperature. Atomistic simulations reveal that the stress-driven event involves virtually instantaneous short-range atomic rearrangement, while the thermally activated event is the percolation of the fast event accommodated by the long-range atomic diffusion. The insights may clarify the underlying physical mechanisms behind the phenomenological description and shed light on correlating the hierarchical dynamics and structural heterogeneity of amorphous solids.
dc.publisherAmerican Physical Society
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials
dc.subject.lcshMetallic glasses
dc.subject.lcshAmorphous materials
dc.subject.lcshStress relaxation (Physics)
dc.titleTransition from stress-driven to thermally activated stress relaxation in metallic glasses
dc.subject.lemacVidres metàl·lics
dc.contributor.groupUniversitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
dc.relation.projectidUS/NSFC/11132011, 11402269, 11472287, 51401192, 11572249, 51611130120
dc.relation.projectidChina/National Key Basic Research Program of China/2012CB937500
dc.relation.projectidChina/Natural Science Foundation of Shaanxi Province/ 2016JM5009
dc.relation.projectidChina/The Aeronautical Science Foundation of China/2015ZF53072
dc.relation.projectidChina/National Science Foundation/ State Key Laboratory of Nonlinear Mechanics LNM20151
dc.relation.projectidChina/CAS/SAFEA International Partnership Program for Creative Research
dc.relation.projectidChina/Fundamental Research Funds for the Central Universities/3102015ZY027
dc.relation.projectidChina/Fundamental Research Funds for the Central Universities/3102015BJ(II)JGZ019
upcommons.citation.authorQiao, J., Wang, Y., Zhao, L., Dai, L., Crespo, D., Pelletier, J., Keer, L., Yao, Y.
upcommons.citation.publicationNamePhysical review B

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