Observing strain glass transition in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)high entropy alloy with Elinvar effect  

作　　者：Kaichao Zhang Kai Wang Bin Wang Chao Lv Jiaxing Zheng Guanqi Li Yu Fu Wenlong Xiao Qingqing Cai Xutao Nie Yingfeng Shao Huilong Hou Xinqing Zhao 

机构地区：[1]School of Materials Science and Engineering,Beihang University,Beijing 100191,China [2]China Aerodynamics Research and Development Center,Mianyang 621000,China [3]State Key Laboratory of Nonlinear Mechanics,Chinese Academy of Sciences,Institute of Mechanics,Beijing 100190,China [4]Tianmushan Laboratory(Zhejiang Provincial Laboratory for Aviation),Hangzhou 310000,China

出　　处：《Journal of Materials Science & Technology》2024年第1期16-23,共8页材料科学技术（英文版）

基　　金：supported by the National Key Research and De-velopment Program of China(No.2022YFB3800052);the National Natural Science Foundation of China(Nos.12002013,51971009,and 51831006);the Zhejiang Natural Science Foundation(No.LZ23E010004).H.L.Hou also acknowledges the support of the Fundamental Research Funds for the Central Universities(No.501LKQB2020105028);the Opening Fund of the State Key Lab-oratory of Nonlinear Mechanics.

摘　　要：Exploring the phase transition of high entropy alloys(HEAs)with multiple major elements is of great importance for understanding the underlying physical mechanisms.Macroscopic martensitic phase tran-sition has been frequently reported in HEAs,however,nanoscale microstructural phase evolution has not been investigated to the same extent.Herein,we have prepared the Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA and investi-gated the strain glass transition and its associated properties using dynamic mechanical analysis and mi-crostructure characterization.We have found that the elastic modulus in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA deviates from Wachtman’s equation and observed the Elinvar effect in the form of temperature-independent mod-ulus in the temperature range from 150 K to 450 K and frequency-dependence modulus around 220 K.The strain glass transition has been evidenced in Ti_(33)Nb_(15)Zr_(25)Hf_(25)O_(2)HEA by the formation and growth of nano-sized domains during in-situ transmission electron microscopy(TEM)cooling,and substantiated by the broken ergodicity during zero-field-cooling/field-cooling.The strain glass transition is believed to account for the Elinvar effect,where the modulus hardening of nano-sized domains compensates dynam-ically with the modulus softening of the transformable matrix.

关 键 词：High entropy alloys Strain glass transition Elinvar effect Microstructural evolution NANODOMAINS 

分 类 号：TG1[金属学及工艺—金属学]