A strategy for designing stable nanocrystalline alloys by thermo-kinetic synergy

作     者：H.R.Peng B.S Liu F.Liu H.R.Peng;B.S Liu;F.Liu

作者机构：State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an710072China School of Materials and Chemical EngineeringXi’an Technological UniversityXi’an710021China Analytical and Testing CenterNorthwestern Polytechnical UniversityXi’an710072China 

基　　金：financial support from the National Key R&D Program of China(Nos.2017YFB0703001,2017YFB0305100) the National Natural Science Foundation of China(Nos.51134011,51431008) the Research Fund of the State Key Laboratory of Solidification Processing(Nos.117-TZ-2015,159QP-2016) the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(No.CX201826) 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第36卷第8期

页      码：21-31页

摘      要：Aiming to design stable nanocrystalline(NC)materials,so far,it has been proposed to construct nanostructure stability maps in terms of thermodynamic parameters,while kinetic stabilization has seldom been considered,despite the synergy of thermodynamics and ***,the thermodynamically stabilized NC materials may be easily subjected to grain growth at high temperatures due to the weakly kinetic *** from the thermo-kinetic synergy,a stabilization criterion is proposed as a function of intrinsic solute parameters(*** activation energy for bulk diffusion and the segregation enthalpy),intrinsic solvent parameters(*** intrinsic activation energy for GB migration and the GB energy)and processing parameters(*** grain size,the temperature and the solute concentration).Using first-principles calculations for a series of combinations between fifty-one substitutional alloying atoms as solute atoms and Fe atom as fixed solvent atom,it is shown that the thermal stability neither simply increases with increasing the segregation enthalpy as expected by thermodynamic stabilization,nor monotonically increases with increasing the activation energy for bulk diffusion as described by kinetic *** combination of thermodynamic and kinetic contributions,the current stabilization criterion evaluates quantitatively the thermal stability,thus permitting convenient comparisons among NC materials involved by various combinations of the solute atoms,the solvent atoms,or the processing *** of this thermo-kinetic stabilization criterion has been tested by current experiment results of Fe-Y alloy and previously published data of Fe-Ni,Fe-Cr,Fe-Zr and Fe-Ag alloys,etc.,which opens a new window for designing NC materials with sufficiently high thermal stability and sufficiently small grain size.

主 题 词：Thermo-kinetic Synergy Criterion Thermal stability Nanocrystalline materials 

学科分类：07[理学] 070205[070205] 08[工学] 080501[080501] 0805[工学-能源动力学] 0702[理学-物理学类] 

核心收录：

D　O　I：10.1016/j.jmst.2019.11.006

馆 藏 号：203880652...