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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2024.3
- 수록면
- 726 - 734 (9page)
- DOI
- 10.1007/s12540-023-01530-7
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초록· 키워드
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The study investigates that a high-entropy alloy based on AlCoCrFeNi is mechanically alloyed (MA) for 40 h with 1 wt%Y2O3dispersed and then consolidated through vacuum hot pressing (VHP). In VHP, three temperatures are used for consolidation:800 °C, 900 °C, and 1000 °C. Microanalysis of the powder aggregate formed by MA revealed the presence ofmostly face-centered cubic (FCC) and body-centered cubic (BCC) phases, along with a metastable AlFe4O12Y3garnet phase.
The enthalpy of mixing Y and Al induced the development of the garnet phase. In addition, after the consolidation of thepowder sample at different temperatures, microstructural investigations indicated that the FCC and BCC phases generatedduring MA were stable owing to sluggish diffusion. By contrast, the garnet phase generated during the MA dissociated intoan intermetallic phase based on Yttrium. The slower heating rates associated with VHP (in comparison to the rapid heatingrates associated with spark plasma sintering) may be responsible for the dissociation of the garnet phase. The sample sinteredat 1000 °C exhibited a bimodal grain distribution, with grain sizes ranging from 100 to 800 nm, as determined by transmissionelectron microscopy. In addition, this sample had the highest measured hardness of 1353 ± 20 Hv.
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