https://scholars.lib.ntu.edu.tw/handle/123456789/598352
標題: | Verification of the ability of Cu to dissolve in BCC δ in a δ-γ Solid Solution above 1200 °C and boosting δ nano-hardness in Cu-containing PHSS | 作者: | Hsueh C.-H Sun Y.-H Tsao T.-C Li C.-L Liu J.-H HUNG-WEI YEN Hsueh C.-H JER-REN YANG Wang S.-H Yeh J.-W Chang H.-Y CHUN-HWAY HSUEH |
關鍵字: | Dual phases;Nanoindentation;Precipitation;Stainless steels;Transmission electron microscopy (TEM);Quenching;Solid solutions;Stainless steel;Dual phase;Dual phasis;Excess vacancy;Highest temperature;Nano Hardness;Nano indentation;Nano precipitations;Stabiliser;Thermodynamics calculations;Transmission electron microscopy;High resolution transmission electron microscopy | 公開日期: | 2022 | 卷: | 211 | 來源出版物: | Scripta Materialia | 摘要: | Because Cu is an austenite γ stabilizer, it is thought that Cu only dissolves in the FCC γ phase but not in the BCC δ when Cu-containing PHSS are treated in a dual δ-γ solid solution at high temperature. However, the nano precipitation of Cu in the allotriomorphic δ found upon quenching from 1295°C. To study this unexpected phenomenon, thermodynamic calculations were performed. The predicted solubilities of Cu in the γ and δ at 1295°C were 3.52 and 1.99 wt%. Consequently, quenching the solid solution from 1295 to 25°C results in the ultra-supersaturation of Cu in the δ. The vacancy concentration in the δ solution was estimated to change from 1024 vac./m3 at 1295°C to105 vac./m3 at 25°C; quenching yields excess vacancies. Thus, Cu-rich nanoparticles precipitate in the δ matrix through the interdiffusion of the ultra-supersaturated Cu and excess vacancies. ? 2022 Acta Materialia Inc. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85122566561&doi=10.1016%2fj.scriptamat.2022.114505&partnerID=40&md5=e9f9338c9c6085e06131d02cf49965b5 https://scholars.lib.ntu.edu.tw/handle/123456789/598352 |
ISSN: | 13596462 | DOI: | 10.1016/j.scriptamat.2022.114505 |
顯示於: | 材料科學與工程學系 |
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