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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.10
- 수록면
- 3,787 - 3,795 (9page)
- DOI
- 10.1007/s12540-020-00740-7
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초록· 키워드
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We investigated the analytic relation between hardness and compressive yield stress using an expanding cavity model (ECM)for nanoporous gold (np-Au). We prepared three np-Au samples with ligament sizes 30.61, 59.36 and 116.33 nm by freecorrosiondealloying and post heat treatment. The indentation contact morphology was examined to estimate the hardnessaccurately from the nanoindentation load-depth curve. Unlike conventional dense metals, the deformation was confined to theprojected contact area, and the center of the residual impression was dominated by densification. The projected contact areaestimated by the Oliver?Pharr method was overestimated, so that a new contact area function was proposed that consideredthe indentation contact morphology of np-Au. It was confirmed that a hardness value taking into account the indentationcontact morphology of np-Au matches well with the hardness derived by direct measurement of the residual impression.
We modeled the ratio of hardness to compressive yield stress for np-Au using an ECM. The scaling factors, which representthe extra strain-hardening in the core in the ECM, were analyzed for np-Au and dense metals. An ECM that better matchesnp-Au is suggested based on the scaling factor resulting from densification beneath the indenter.
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