Disorder trapping and formation of antiphase nanodomains in Ni3Sn: In situ observation and high resolution characterization

SCRIPTA MATERIALIA

卷:193

Article

Zhao, Rijie¹  Yang, Tingting²  Wang, Yeqing¹  Ren, Yang³  Gao, Jianrong¹ 

[1] Northeastern Univ, Key Lab Electromagnet Proc Mat, Minist Educ, Shenyang 110819, Peoples R China

[2] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Hebei, Peoples R China

[3] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

关键词: Intermetallics;    Rapid solidification;    X-ray diffraction;    HAADF;    Antiphase domains;   

DOI  :  10.1016/j.scriptamat.2020.10.037

来源: Elsevier

【 摘 要 】

Rapid solidification of the intermetallic Ni3Sn compound from an undercooled liquid was investigated using time-resolved synchrotron X-ray diffraction. Primary growth of an ordered and a disordered cubic solid was observed in situ at a low and a high undercooling, respectively. The disordered cubic solid was reordered after rapid solidification and experienced a solid-state transformation in cooling. A HRTEM study revealed high density of crystal defects and nanodomains in the transformed matrix. A HAADFSTEM study determined that the nanodomains are antiphase domains with chemical disorder. These observations indicated a possibility of online control of mechanical properties in additively manufactured intermetallics. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free