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タイトル: | Recrystallization Behavior of CoCrCuFeNi High-Entropy Alloy |
著者: | Park, Nokeun Watanabe, Ikuto Terada, Daisuke Yokoyama, Yoshihiko Liaw, Peter K. Tsuji, Nobuhiro https://orcid.org/0000-0002-2132-1327 (unconfirmed) |
著者名の別形: | 辻, 伸泰 |
発行日: | 8-Oct-2014 |
出版者: | Springer US |
誌名: | Metallurgical and Materials Transactions A |
巻: | 46 |
号: | 4 |
開始ページ: | 1481 |
終了ページ: | 1487 |
抄録: | We investigated the recrystallization behavior of a cold-rolled CoCrCuFeNi high-entropy alloy (HEA). Two different face-centered cubic phases having different chemical compositions and lattice constants in the as-cast specimen have different chemical compositions: One phase was the Cu-lean matrix and the other was the Cu-rich second phase. The second phase remained even after a heat treatment at 1373 K (1100 °C) and Cu enriched more in the Cu-rich second phase. The calculated mixing enthalpies of both Cu-lean and Cu-rich phases in the as-cast and heat-treated specimens explained that Cu partitioning during the heat treatment decreased the mixing enthalpy in both phases. In the specimens 90 pct cold rolled and annealed at 923 K, 973 K, and 1073 K (650 °C, 700 °C, and 800 °C), recrystallization proceeded with increasing the annealing temperature, and ultrafine recrystallized grains with grain sizes around 1 μm could be obtained. The microhardness tended to decrease with increasing the fraction recrystallized, but it was found that the microhardness values of partially recrystallized specimens were much higher than those expected by a simple rule of mixture between the initial and cold-rolled specimens. The reason for the higher hardness was discussed based on the ultrafine grain size, sluggish diffusion expected in HEAs, and two-phase structure in the CoCrCuFeNi alloy. |
著作権等: | The final publication is available at Springer via http://dx.doi.org/10.1007/s11661-014-2594-5. The full-text file will be made open to the public on 08 October 2015 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/200193 |
DOI(出版社版): | 10.1007/s11661-014-2594-5 |
出現コレクション: | 学術雑誌掲載論文等 |
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