[Kovove materialy - Metallic materials]
    Mon - January 25, 2021 - 14:18 No. of hits : 1227820 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 58 (2020), Issue 5

Microstructure and fracture mechanism of Cu-Y2O3 composite
vol. 58 (2020), no. 5, pp. 363 - 369

This work aimed to examine the structure of Cu-Y2O3 composite, analyse the fracture mechanism, and propose the model of fracture. The in-situ tensile test in SEM was used for direct observation of the process of deformation and fracture. Microscopic analysis revealed that Cu matrix grains are spherical with a mean diameter of ∼ 500 nm. EDX and selected area electron diffraction confirmed the presence of Y2O3 particles. Particles can be divided, according to the size, into two categories: smaller A (up to 20 nm) and more significant B (20–100 nm). The in-situ tensile test in SEM showed that the first cracks were created on the particle-matrix interfaces and in the triple point. Subsequent coalescence was observed, and we assumed that the cracks propagate along the grain boundaries. The fracture surface has a transcrystalline ductile character. Based on the in-situ observations and analysis, we proposed the model of fracture mechanism.

Key words
Cu composite, Y2O3, high-resolution scanning transmission electron microscopy (HRSTEM), structure, fracture mechanism

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.

Article abstracts updated: 2021-01-15 08:18      
Articles in press revised: 2020-10-30 12:09     
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