Kinetics study and fragility of (Cu50Zr43Al7)98Y2 bulk metallic glass

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Mehdi Malekan, Alireza Jalali
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Abstract

Crystallization transformation kinetics and fragility of (Cu50Zr43Al7)98Y2 bulk metallic glass (BMG) were investigated at non-isothermal and isothermal conditions by differential scanning calorimetry. Activation energies for the BMG were calculated for the glass transition, onset crystallization, and crystallization peak using various methods of non-isothermal analysis. Results suggested that atomic rearrangement during glass transition is more complex than crystallization, and growth poses greater challenges than nucleation. Isothermal analysis conducted in the supercooled liquid region provides evidence of crystallization being controlled by diffusion, with a calculated mean Avrami exponent of 2.2. Additionally, the findings of fragility studies and kinetic studies demonstrated a strong correlation with the glass-forming ability (GFA), thereby validating the high GFA of the BMG analyzed in this study. Thus, this research results provide a detailed understanding of the complex crystallization kinetics, thermal behavior, and GFA of (Cu50Zr43Al7)98Y2 BMG, emphasizing its potential in materials science applications.

(Cu50Zr43Al7)98Y2 块状金属玻璃的动力学研究和脆性
通过差示扫描量热法研究了 (CuZrAl)Y 块状金属玻璃 (BMG) 在非等温和等温条件下的结晶转变动力学和脆性。利用各种非等温分析方法计算了 BMG 在玻璃化转变、开始结晶和结晶峰时的活化能。结果表明,玻璃化转变过程中的原子重排比结晶更为复杂,生长比成核面临更大的挑战。在过冷液体区域进行的等温分析表明,结晶受扩散控制,计算得出的平均阿夫拉米指数为 2.2。此外,脆性研究和动力学研究的结果表明与玻璃形成能力(GFA)密切相关,从而验证了本研究分析的 BMG 具有较高的 GFA。因此,本研究成果提供了对(CuZrAl)Y BMG 复杂结晶动力学、热行为和 GFA 的详细了解,强调了其在材料科学应用中的潜力。
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来源期刊
Thermochimica Acta
Thermochimica Acta 化学-分析化学
CiteScore
6.50
自引率
8.60%
发文量
210
审稿时长
40 days
期刊介绍: Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes
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