On the shear modulus and thermal effects during structural relaxation of a model metallic glass:Correlation and thermal decoupling

作     者：Hongbo Zhou Vitaly Khonik Gerhard Wilde Hongbo Zhou;Vitaly Khonik;Gerhard Wilde

作者机构：Institute of Materials PhysicsUniversity of MuensterWilhelm-Klemm Str.10Muenster 48149Germany Department of General PhysicsVoronezh State Pedagogical UniversityLenin Str.86Voronezh 394043Russia 

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

年 卷 期：2022年第103卷第8期

页      面：144-151页

核心收录：

学科分类：0806[工学-冶金工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：financial support by German Research Foundation under the grant No.W11899/29-1 the China Scholarship Council for its financial support the financial support from Russian Science Foundation under the grant No.20-62-46003(measurements of the shear modulus and discussion on the results) 

主　　题：Bulk metallic glass In-situ shear modulus Thermal properties Relaxation Interstitialcy theory 

摘      要：Pd_(40)Ni_(40)P_(20)(at.%)samples with different enthalpy states were fabricated through high-pressure torsion or sub-Tg annealing of the as-cast ***,the underlying structural relaxation was studied by in-situ shear modulus measurements and modulated differential scanning *** results show that high-pressure torsion leads to shear modulus softening and an increase of the nonreversible exothermic enthalpy,indicating a significant structural rejuvenation,while sub-Tg annealing causes shear modulus hardening and a decrease of the nonreversible exothermic *** reversible endothermic effect which can reflect the fractional change of supercooled liquid with temperature was found to be almost identical for all samples,and independent of deformation or thermal *** total heat flow can be well correlated with the shear modulus within the framework of interstitialcy ***,we demonstrate that the structural relaxation below Tg decouples into internal stress relaxation andβ-*** addition,this work indicates that the processes ofα-relaxation andβ-relaxation in the metallic glass are of similar structural origin but occur on different spatial scales.