Correlation between mechanical and thermodynamic properties for La-Ce-Ni-Cu-Al high-entropy metallic glasses
Correlation between mechanical and thermodynamic properties for La-Ce-Ni-Cu-Al high-entropy metallic glasses作者机构：Institute of Amorphous Matter Science and School ofMaterials Science and Engineering Hefei University of Technology Hefei 230009 Anhui China
出 版 物：《Journal of Iron and Steel Research International》 (Journal of Iron and Steel Research, International)
年 卷 期：2018年第25卷第6期
页 面：658-665页
核心收录：
学科分类：080701[工学-工程热物理] 08[工学] 0807[工学-动力工程及工程热物理] 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 National Key Research and Development Project of China MOST 973 Program 国家自然科学基金 the Fundamental Research Funds for the Central Universities in China
主 题：High-entropy bulk metallic glass Fracture mechanism Crystallization Avrami exponent Glass-transitionactivation energy
摘 要：The mechanical properties, thermodynamic features and their correlation were studied for La-Ce-Ni-Cu-Al high-entropy bulk metallic glasses （HE-BMGs）. Compressive testing indicated that the HE-BMGs are ductile on a microscopic scale but brittle on a macroscopic scale, because of the low fragility index rn of the HE-BMGs. In the non-isothermal process, the activation energies for glass transition for these HE-BMGs are the lowest of the known HE-BMGs. Large values of the Avrami exponent n imply that the crystallization process proceeded through three-dimensional growth and with an increasing nucleation rate. The activation energy for glass transition （Eg） is almost proportional to the HE-BMG fracture strength, because a higher Eg is required to dislodge the molecules from the glassy configuration for the HE-BMGs with a high strength. The findings provide unambiguous evidence for the correlation between the mechanical and thermodynamic properties.
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