Effect of pre-deformation on structure and dynamic relaxation behavior of a Zr-based bulk metallic glass

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids Pub Date : 2025-06-09 DOI:10.1016/j.jnoncrysol.2025.123672

Aasma Tabassum , Wei Xiong , Baoan Sun , Ying Liu , Jing Tao Wang

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Abstract

This study investigates the effects of cold rolling deformation on the structure, free volume, and dynamic relaxation behaviors of a Zr-based bulk metallic glass (BMG). Subsequently, the relaxation enthalpy, free volume, and relaxation behavior of shear bands were extracted using the mixing principle. The results indicate that the relaxation enthalpy and free volume reach 5.09±0.67 kJ/mol and 0.92±0.12 % for the 80 % thickness reduction samples, indicating significant rejuvenation introduced by pre-existing shear bands. The HV hardness of the shear band is just 355±16, about 31.7 % lower than undeformed glassy regions, demonstrating dramatic structural softening in shear regions. The shear band’s relaxation enthalpy and free volume are ∼7.877 kJ/mol and ∼1.42 %. The β relaxation intensity in 80 % deformed samples increases ∼44 % compared to as-cast samples. Moreover, for the shear band, this relaxation intensity almost improves by 80 % respectively, when compared to the as-cast samples.

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预变形对zr基大块金属玻璃结构和动态弛豫行为的影响

研究了冷轧变形对zr基大块金属玻璃（BMG）的结构、自由体积和动态弛豫行为的影响。随后，利用混合原理提取了剪切带的松弛焓、自由体积和松弛行为。结果表明：厚度减小80%的试样的弛豫焓和自由体积分别达到5.09±0.67 kJ/mol和0.92±0.12%，表明剪切带引入了明显的回复性；剪切带的HV硬度仅为355±16，比未变形的玻璃区低约31.7%，显示出剪切区明显的结构软化。剪切带的松弛焓和自由体积分别为~ 7.877 kJ/mol和~ 1.42%。与铸态试样相比，80%变形试样的β弛豫强度提高了~ 44%。此外，与铸态试样相比，剪切带的松弛强度分别提高了近80%。

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来源期刊

Journal of Non-crystalline Solids 工程技术-材料科学：硅酸盐

CiteScore

6.50

自引率

11.40%

发文量

576

审稿时长

35 days

期刊介绍： The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.