Microstructural heterogeneity evolution of Zr-based bulk metallic glass during nanoindentation creep

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

Journal of Non-crystalline Solids Pub Date : 2025-01-23 DOI:10.1016/j.jnoncrysol.2025.123407

Bowen Li , Guangkai Liao , Kaikai Cao , Zhenyan Xie , Bin Li , Zili Wang , Yuejun Liu

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引用次数: 0

Abstract

The creep behavior and micro-mechanisms of Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 bulk metallic glass (Zr-BMG) were investigated at room temperature using nanoindentation technology under different loading rates and peak loads (holding loads). The creep stress was calculated using the work-of-indentation, the creep stress-time curve was fitted and analyzed by combining the Kohlrausch-Williams-Watts (KWW) equation, the activation volume formula, and the generalized Maxwell model, revealing the dynamic evolution of microstructural heterogeneity, flow units, relaxation time spectra, and activation energy spectra. The results show that as the peak load and loading rate increase, the stress drop magnitude increases, exhibiting a typical stress relaxation phenomenon. The activation energy is closely related to the internal microstructural heterogeneity, the more significant the microstructural heterogeneity, the lower the required activation energy, making flow units more easily activated. This study provides important experimental evidence and theoretical support for a deeper understanding of the creep behavior and micro-mechanical mechanisms of metallic glass.

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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.