Nanoindentation loading rate sensitivity of the mechanical behavior of cured isotropic conductive adhesives

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Mechanics of Time-Dependent Materials Pub Date : 2025-02-19 DOI:10.1007/s11043-025-09767-y

Xinkuo Ji, Gesheng Xiao, Zhidan Zhou, Chenfei Song, Huanhuan Lu

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引用次数: 0

Abstract

The mechanical properties of isotropic conductive adhesive (ICA) have received increasing attention due to its widespread application in microelectronic packaging. In this work, the loading and strain rate sensitivity of cured epoxy-based ICA were investigated using nanoindentation. The ICA was prepared and indented under quasi-static and continuous stiffness measurement (CSM) modes under varying loading rates (\(\dot{P}\)) and loading strain rates (\(\dot{P} / P\)). The results demonstrate a loading/strain rate hardening effect on the hardness of ICA. Compared with quasi-static test measurement, the CSM mode seems to be a more effective measurement for the hardness results of ICA. During nanoindentation, a competitive interaction between hardening and softening mechanisms was observed: softening dominated at higher loading strain rates, while hardening prevailed at lower rates. Under both loading modes, creep displacement and creep strain rate increased with strain/loading rate. In addition, the creep displacement rose rapidly during the initial holding time before stabilizing, while the corresponding creep strain rate decreased progressively to a steady-state creep stage.

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来源期刊

Mechanics of Time-Dependent Materials 工程技术-材料科学：表征与测试

CiteScore

4.90

自引率

8.00%

发文量

审稿时长

>12 weeks

期刊介绍： Mechanics of Time-Dependent Materials accepts contributions dealing with the time-dependent mechanical properties of solid polymers, metals, ceramics, concrete, wood, or their composites. It is recognized that certain materials can be in the melt state as function of temperature and/or pressure. Contributions concerned with fundamental issues relating to processing and melt-to-solid transition behaviour are welcome, as are contributions addressing time-dependent failure and fracture phenomena. Manuscripts addressing environmental issues will be considered if they relate to time-dependent mechanical properties. The journal promotes the transfer of knowledge between various disciplines that deal with the properties of time-dependent solid materials but approach these from different angles. Among these disciplines are: Mechanical Engineering, Aerospace Engineering, Chemical Engineering, Rheology, Materials Science, Polymer Physics, Design, and others.