Crystallization Kinetics of ZrxTiNiCuBe High-Entropy Bulk Metallic Glasses

被引：0

作者：

Wang, Yanfang ^{[1
]}

He, Yaru ^{[1
]}

Hu, Fangyu ^{[1
]}

Shi, Zhiqiang ^{[1
]}

机构：

[1] China Univ Petr East China, Sch Mat Sci & Engn, Qingdao 266580, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2024年 / 53卷 / 11期

关键词：

high entropy bulk metallic glass alloys (HE-BMGs); crystallization dynamics; non-isothermal crystallization; isothermal crystallization; crystallization activation energy; MECHANICAL-PROPERTIES; RESEARCH PROGRESS; TI; CO; BEHAVIOR; ER;

D O I：

10.12442/j.issn.1002-185X.20230588

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Non-equiatomic ZrxTiNiCuBe (x-1.5, 2, 2.5, 3, 3.5, at%) high-entropy bulk metallic glasses (HE-BMGs) were prepared by copper mold casting method, and the crystallization kinetics was studied by differential scanning calorimeter (DSC) under both non-isochronal and isothermal conditions. The non-isothermal crystallization kinetics of ZrxTiNiCuBeHE-BMGs show a multiple-stage process. The characteristic temperatures increase with the increase in the heating rate, showing obvious kinetics effects. The activation energy calculated by the Kissinger equation shows. an order of E-g>E-x>E-pl, indicating that overcoming the energy barrier for the rearrangement is more difficult than atoms nucleation process and the grain growth process of crystallization. The activation energy of crystallization event is in the order of ExEyEs, demonstrating the non-isothermal crystallization processing is from easy to difficult. The activation energy increases and then decreases with the increase in Zr content. Zr2TiNiCuBe HE-BMG has a larger activation energy and better thermal stability than others. Isothermal crystallization shows a single exothermic behavior after different incubation periods. As isothermal temperature increases, incubation time decreases rapidly and the width of exothermic peak decreases markedly. The crystallization volume fraction (x) vs time (1) curves are typical "S" type. With the decrease in isothermal temperature, the x vs 1 curves become gentle, indicating that the process of crystallization slows down. The local crystallization activation energy for isothermal processing was calculated using the Arrhenius formula. With the increase in Zr content, the local crystallization activation energy gradually decreases and the thermal stability decreases. The Avrami exponent obtained by the Johnson-Mehl-Avrami (JMA) equation is between 1.5 and 2.5, indicating that the isothermal crystallization mechanism is mainly a diffusion-controlled growth process with a nucleation rate decrease.

引用

页码：3224 / 3232

页数：9