Nanotwin formation in Ni-Mo-W alloys deposited by dc magnetron sputtering

SCRIPTA MATERIALIA

卷:186

Article

Valentino, Gianna M.¹  Shetty, Pralav P.²  Chauhan, Ankur¹  Krogstad, Jessica A.²  Weihs, Timothy P.³  Hemker, Kevin J.^1,3 

[1] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA

[2] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

[3] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

关键词: Sputtering;    Nanoindentation;    Hardness;    Nanotwins;    Deposition rate;   

DOI  :  10.1016/j.scriptamat.2020.05.031

来源: Elsevier

【 摘 要 】

Nanotwinned metals and alloys have an attractive suite of properties, but the formation of the underlying nanostructure is generally dependent on the alloy chemistry and processing conditions. This study was undertaken to investigate the effect of deposition rate on nanotwin formation in sputter deposited Ni84Mo11W5 that possess ultrahigh strength and stability. Deposition rates of 0.5-2.3 nm/s were examined and the grain size, texture, twin spacing and hardness were characterized. Minimal variations in the underlying nanostructure and attendant hardness were observed, elucidating a wide processing window and the importance of chemistry on the formation of nanotwins in this alloy. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free