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铝箔已被广泛应用于电子工业,现又被用作锂电池正极集流体,因而对于铝箔的力学性能要求也在不断提高。通过表征和研究铝箔的力学性能(弹性模量、屈服强度、断裂强度等),能够为铝箔相关技术的可靠性研究提供必要的数据支持和理论指导,从而使铝箔得到合理和可靠的使用。本文运用微拉伸、纳米压痕和动态力学分析(DMA)实验,分别研究了不同厚度的H18态和O态铝箔的力学性能。结果表明两者的弹性模量均约为30GPa,仅为块材的一半;H18态铝箔材料的断裂强度要明显强于块材,而O态铝箔材料的断裂强度则明显小于块材;此外,H18态铝箔材料的屈服强度明显大于块材,O态铝箔材料的屈服强度与块材相仿。并且,随着厚度的增加,H18态铝箔材料的延伸率显著增大,但是仍远小于块材。通过扫描电子显微镜(SEM)对铝箔材料断裂形貌进行微观分析,发现铝箔的拉伸断裂方式为脆性断裂。
Aluminum foil has been widely used in the electronics industry, is also used as a positive current collector for lithium batteries, which for the mechanical properties of aluminum foil requirements are also rising. By characterizing and studying the mechanical properties of aluminum foil (elastic modulus, yield strength, breaking strength, etc.), it can provide the necessary data support and theoretical guidance for the reliability research of aluminum foil related technologies, so that the aluminum foil can be used reasonably and reliably. In this paper, the mechanical properties of H18 and O-state aluminum foils with different thicknesses were studied by means of micro-stretching, nanoindentation and dynamic mechanical analysis (DMA). The results show that the elastic modulus of both are about 30GPa, which is only half of that of the bulk material. The breaking strength of the H18 aluminum foil is obviously stronger than that of the bulk material, but the breaking strength of the aluminum foil is smaller than that of the bulk material. The yield strength of H18 aluminum foil material is obviously larger than that of bulk material. The yield strength of O-state aluminum foil material is similar to that of bulk material. And, as the thickness increases, the elongation of the H18-state aluminum foil material increases significantly, but is still much smaller than the bulk material. The fracture morphology of aluminum foil was analyzed microscopically by scanning electron microscope (SEM), and the tensile fracture mode of aluminum foil was found to be brittle fracture.