Real-time visualization of particle evolution during reactive flux-assisted processing of aluminum melts

SCRIPTA MATERIALIA

卷:201

Article

Reese, C. W.¹  Gladstein, A.¹  Shevchenko, P.²  Xiao, X.³  Shahani, A. J.¹  Taub, A. I.^1,4 

[1] Univ Michigan, Mat Sci & Engn, 2300 Hayward St,HH Dow Bldg,Rm 2062, Ann Arbor, MI 48109 USA

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

[3] Brookhaven Natl Lab, Natl Synchrotron Light Source 2, Upton, NY 11973 USA

[4] Univ Michigan, Mech Engn, Ann Arbor, MI 48109 USA

关键词: Metal matrix composites (mmc);    In situ characterization;    Nucleation and growth;    Synchrotron x-ray radiation;    Carbides;   

DOI  :  10.1016/j.scriptamat.2021.113978

来源: Elsevier

【 摘 要 】

A multi-modal, multi-scale correlative tomography investigation of Al-TiC metal matrix composites processed via flux-assisted reaction synthesis is reported. Synchrotron X-ray microradiography is utilized to visualize the reaction and particle evolution in real-time. Changes in particle diameter and areal number density suggest that the process is nucleation-rather than growth-dominated. At 950 degrees C, the bulk of the reaction takes place in a relatively short time span of less than 600 s. The microstructure is imaged at higher resolution in 2D (scanning electron microscopy) and 3D (synchrotron X-ray nanotomography), revealing the formation of carbide particles with a hexagonal platelet morphology. We propose that the morphology arises due to the incorporation of Si impurities during the experiment. It is expected that the correlative tomography workflow and analysis may guide future metal matrix composite (MMC) processing strategies. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free