https://scholars.lib.ntu.edu.tw/handle/123456789/598388
標題: | Gradient microstructure and interfacial strength of CoCrFeMnNi high-entropy alloy in solid-state ultrasonic welding | 作者: | Lin J.-Y Lai Z.-H Otsuki T Yen H.-W Nambu S. HUNG-WEI YEN |
關鍵字: | Electron backscattered diffraction;High-entropy alloys;Transmission kikuchi diffraction;Ultrasonic welding;Chromium alloys;Cobalt alloys;Dynamic recrystallization;Entropy;Iron alloys;Manganese alloys;Microstructure;Plastic deformation;Welding;Bonding strength;Discontinuous dynamic recrystallization;Electron back-scattered diffraction;Gradient microstructure;Gradient strength;High entropy alloys;Interfacial strength;Shears strength;Ultrasonic weldings;Diffraction | 公開日期: | 2021 | 卷: | 825 | 來源出版物: | Materials Science and Engineering A | 摘要: | This study investigated the microstructure gradient and interfacial strength of CoCrFeMnNi high-entropy alloy bonded by ultrasonic welding (USW). It was found that bonding occurred after welding for 1.0 s and bonding strength reached about 1500 N (30 MPa of shear strength) after welding for 7.0 s. Such interfacial bonding was featured with the ultrafine microstructure with a grain size of 100–200 nm, which resulted from discontinuous dynamic recrystallization induced by severe plastic strain and a peak temperature of 511 °C. Strain and temperature due to severe plastic deformation in the ultrasonic sliding decreased with increasing distance from the interface. This contributed to a microstructural gradient from discontinuous dynamic recrystallization to continuous dynamic recrystallization and finally dislocation cells. This gradient microstructure was confined to areas within about 2 μm from the interface and showed no solidification defects or transformation of detrimental phases. ? 2021 |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85112005235&doi=10.1016%2fj.msea.2021.141885&partnerID=40&md5=8950916e6625a8f88455a205e206bea7 https://scholars.lib.ntu.edu.tw/handle/123456789/598388 |
ISSN: | 09215093 | DOI: | 10.1016/j.msea.2021.141885 |
顯示於: | 材料科學與工程學系 |
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