Impression creep properties of hypoeutectic Al-Si alloys with scandium additions
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Publication Details
Author list: Seensattayawong P., Pandee P., Limmaneevichitr C.
Publisher: Elsevier
Publication year: 2018
Volume number: 5
Issue number: 3
Start page: 9440
End page: 9446
Number of pages: 7
ISSN: 2214-7853
eISSN: 2214-7853
Languages: English-Great Britain (EN-GB)
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Abstract
The present work pertains to an improvement of high temperature stability of age hardenable hypoeutectic Al-Si alloy. Addition of scandium (Sc) was attempted to modify the microstructure and to improve the high temperature stability of the hypoeutectic Al-Si alloy. The high temperature stability was determined by impression creep techniques. The tests were performed at temperature 250ฐC and applied stresses in the range of 160 to 200 MPa for dwell times up to 3000 seconds. The results showed that the creep strength of the hypoeutectic Al-Si alloys was improved. For all loads, hypoeutectic Al-Si alloy with 0.4 wt% Sc had the lowest creep rates and thus the highest creep resistance among all materials tested. This may be attributed to the possible microstructural changes, solute enrichment of the matrix and pinning of the grain boundaries by the fine precipitates. ฉ 2017 Elsevier Ltd. All rights reserved.
Keywords
High temperature stability
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