Abnormal crystallization in Al86Ni6Y 4.5Co2La1.5 metallic glass induced by spark plasma sintering

Li, X, Yan, M, Schaffer, G and Qian, M 2013, 'Abnormal crystallization in Al86Ni6Y 4.5Co2La1.5 metallic glass induced by spark plasma sintering', Intermetallics, vol. 39, pp. 69-73.


Document type: Journal Article
Collection: Journal Articles

Title Abnormal crystallization in Al86Ni6Y 4.5Co2La1.5 metallic glass induced by spark plasma sintering
Author(s) Li, X
Yan, M
Schaffer, G
Qian, M
Year 2013
Journal name Intermetallics
Volume number 39
Start page 69
End page 73
Total pages 5
Publisher Elsevier
Abstract Abnormal crystallization was observed in Al86Ni6Y4.5Co2La1.5 metallic glass powder at about 20 °C below its glass transition temperature (Tg, 271.5 °C) during spark plasma sintering (SPS). The crystallization product, identified to be a hexagonal-structured Al5Co2 phase, was not detected in the same powder when annealed in a differential scanning calorimeter (DSC). Nor was it detected in other Al-based metallic glasses of similar compositions which were annealed around their Tg temperatures by conventional heating. SPS is effective to introduce a unique nanometric intermetallic phase in the amorphous matrix. The abnormal crystallization is attributed to the high applied pressure and non-thermal effects of SPS.
Subject Materials Engineering not elsewhere classified
Keyword(s) A. Intermetallics
B. Glasses
metallic
B. Phase transformation
C. Sintering
DOI - identifier 10.1016/j.intermet.2013.03.013
Copyright notice © 2013 Elsevier Ltd. All rights reserved
ISSN 0966-9795
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