{"title":"均质流动中金属玻璃的机械记忆和弛豫解耦","authors":"","doi":"10.1016/j.ijmecsci.2024.109661","DOIUrl":null,"url":null,"abstract":"<div><p>Due to the structural information submerged into the meta-stable disordered long-range structure, quantitative prediction of the time-dependent deformation of metallic glasses under mechanical stimuli is a challenging task. Specifically, the present understanding of relaxation behavior, particularly in relation to dynamic heterogeneity and the memory effect in metallic glasses during thermo-mechanical treatment, is yet to be totally understood. Here we study the correlation between the relaxation decoupling and mechanical memory effect in metallic glasses, manifested by non-monotonic variation of activation energy and dynamic heterogeneity during creep and stress relaxation. The strain evolution and energetic state show a memory effect in an aging (recovery)-and-creep procedure. The relaxation decoupling and mechanical memory effect originate from the competition between the formation of fast defects by stress and the transition towards slow defects and their annihilation. The strain evolution is dependent on total loading time and total recovery/aging time rather than their orders. Our results shed light on the deformation and history-dependent behaviors of metallic glasses.</p></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":null,"pages":null},"PeriodicalIF":7.1000,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Mechanical memory and relaxation decoupling of metallic glasses in homogenous flow\",\"authors\":\"\",\"doi\":\"10.1016/j.ijmecsci.2024.109661\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Due to the structural information submerged into the meta-stable disordered long-range structure, quantitative prediction of the time-dependent deformation of metallic glasses under mechanical stimuli is a challenging task. Specifically, the present understanding of relaxation behavior, particularly in relation to dynamic heterogeneity and the memory effect in metallic glasses during thermo-mechanical treatment, is yet to be totally understood. Here we study the correlation between the relaxation decoupling and mechanical memory effect in metallic glasses, manifested by non-monotonic variation of activation energy and dynamic heterogeneity during creep and stress relaxation. The strain evolution and energetic state show a memory effect in an aging (recovery)-and-creep procedure. The relaxation decoupling and mechanical memory effect originate from the competition between the formation of fast defects by stress and the transition towards slow defects and their annihilation. The strain evolution is dependent on total loading time and total recovery/aging time rather than their orders. Our results shed light on the deformation and history-dependent behaviors of metallic glasses.</p></div>\",\"PeriodicalId\":56287,\"journal\":{\"name\":\"International Journal of Mechanical Sciences\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":7.1000,\"publicationDate\":\"2024-08-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Mechanical Sciences\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0020740324007021\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Mechanical Sciences","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0020740324007021","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Mechanical memory and relaxation decoupling of metallic glasses in homogenous flow
Due to the structural information submerged into the meta-stable disordered long-range structure, quantitative prediction of the time-dependent deformation of metallic glasses under mechanical stimuli is a challenging task. Specifically, the present understanding of relaxation behavior, particularly in relation to dynamic heterogeneity and the memory effect in metallic glasses during thermo-mechanical treatment, is yet to be totally understood. Here we study the correlation between the relaxation decoupling and mechanical memory effect in metallic glasses, manifested by non-monotonic variation of activation energy and dynamic heterogeneity during creep and stress relaxation. The strain evolution and energetic state show a memory effect in an aging (recovery)-and-creep procedure. The relaxation decoupling and mechanical memory effect originate from the competition between the formation of fast defects by stress and the transition towards slow defects and their annihilation. The strain evolution is dependent on total loading time and total recovery/aging time rather than their orders. Our results shed light on the deformation and history-dependent behaviors of metallic glasses.
期刊介绍:
The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering.
The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture).
Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content.
In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.