2019年12月9日
Deformation microstructures and strength of face-centered cubic high/medium entropy alloys
IOP Conference Series: Materials Science and Engineering
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- 巻
- 580
- 号
- 開始ページ
- 012053
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(国際会議プロシーディングス)
- DOI
- 10.1088/1757-899X/580/1/012053
In this study we report the deformation microstructures and strength of medium entropy alloys (MEAs) and high entropy alloys (HEAs), which are defined as alloys composed of four or less, and five or more principal elements, respectively, with (near-) equi-atomic concentrations. The friction stress (fundamental resistance to dislocation motion in the crystal lattice) and Hall-Petch relationship of various MEAs (CoCrFeNi, CoCrNi, etc.), taken as subsystems of the equi-atomic CoCrFeMnNi HEA, were precisely measured at room temperature. Experimental values of the friction stresses were found to fit with a theoretical model proposed by Toda-Caraballo et al. very well, which indicates that the strength of the alloys is closely related to a heterogeneously distorted crystal lattice. At the same time, values of the average lattice distortion in the alloys were found to be comparable to those in some dilute alloys, contradicting the belief that "severe" lattice distortion is a reason for the higher strength than in dilute systems. Finally, a strengthening mechanism due to element-element interactions was proposed as an additional mechanism in FCC HEAs and MEAs.
- リンク情報
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- DOI
- https://doi.org/10.1088/1757-899X/580/1/012053
- 共同研究・競争的資金等の研究課題
- 高・中エントロピー合金の系統的比較による高濃度固溶体合金の本質的特徴の解明
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85078089087&origin=inward 本文へのリンクあり
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85078089087&origin=inward
- ID情報
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- DOI : 10.1088/1757-899X/580/1/012053
- ISSN : 1757-8981
- eISSN : 1757-899X
- SCOPUS ID : 85078089087