Mass transport in a highly immiscible alloy on extended shear deformation
作者机构：Physical and Computational Sciences DirectoratePacific Northwest National Laboratory902 Battelle BoulevardRichlandWA 99354USA Energy and Environmental DirectoratePacific Northwest National Laboratory902 Battelle BoulevardRichlandWA 99354USA Material Science and Engineering ProgramUniversity of CaliforniaRiversideCA92521USA Colorado School of Mines1500 Illinois St.GoldenCO 8040USA Department of Materials Science and EngineeringNorth Carolina State UniversityRaleighNC27695-7907USA State Key Laboratory of Powder MetallurgyCentral South Uni-versityChangsha 410083China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第134卷第3期
页 面：197-208页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：supported by the Laboratory Directed Research and Development(LDRD) Solid Phase Processing Science Initiative(SPPSi) The ab initio calculations were performed using PNNL Institutional Computing(PIC) service PNNL is a multiprogram national laboratory operated by Battelle Memorial Institute for the U.S. Department of Energy(DOE)
主 题：Tribology Immiscible alloys Nanostructures Shear deformation Forced mixing Atom probe
摘 要：Forced mixing to a single-phase or supersaturated solid solution(SSS)and its prerequisite microstructure evolution in immiscible systems has been a focus of research for fundamental science and practical *** the formation of SSS by shear deformation could enable a material design beyond conventional equilibrium microstructure in immiscible ***,a highly immiscible Cu-50 at.%Cr binary alloy(mixing enthalpy of∼20 kJ mol^(−1))was employed to investigate the microstructure evolution and localized tendencies of SSS during severe shear *** results demonstrate the dislocation mediated microstructural refinement process in each phase of the binary alloy and the mechanisms associated with localized solute supersaturation as a function of shear *** grain refinement in the softer Cu phase occurs owing to the strain localization driving the preferential dynamic *** grain refinement of the Cr phase,however,is enabled by the progressive evolution of grain lamination,splitting,and fragmentation as a function of shear *** solute supersaturation is found to be strongly dependent on the local environments that affect the dislocation activity,including the level of microstructure refinement,the interfacial orientation relationship,the mechanical incompatibility,and the localized preferential phase *** initio simulations confirm that it is more favorable to oxidize Cr than Cu at incoherent Cu/Cr interfaces,limiting the mass transport on an incoherent *** results unveil the mechanism underpinning the non-equilibrium mass transport in immiscible systems upon severe deformation that can be applied to produce immiscible alloys with superior mechanical properties.
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