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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 12/2015

11-09-2015

Precipitation Strengthening in Al-Ni-Mn Alloys

Authors: Yangyang Fan, Kai Huang, Makhlouf M. Makhlouf

Published in: Metallurgical and Materials Transactions A | Issue 12/2015

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Abstract

Precipitation hardening of eutectic and hypoeutectic Al-Ni alloys by 2 to 4 wt pct. manganese is investigated with focus on the effect of the alloys’ chemical composition and solidification cooling rate on microstructure and tensile strength. Within the context of the investigation, mathematical equations based on the Orowan Looping strengthening mechanism were used to calculate the strengthening increment contributed by each of the phases present in the aged alloy. The calculations agree well with measured values and suggest that the larger part of the alloy’s yield strength is due to the Al3Ni eutectic phase, this is closely followed by contribution from the Al6Mn particles, which precipitate predominantly at grain boundaries.
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Footnotes
1
It is assumed that the solidification cooling rate is fast enough that formation of primary O phase is negligible.
 
2
Here the cooling rate ≡ the measured average cooling rate between 1093 K and 913 K (820 °C and 640 °C), which are the pouring temperature and the end of solidification temperature, respectively.
 
3
Samples were soaked at 573 K (300 °C) in an electric box furnace for 100 hours and then pulled at 573 K (300 °C).
 
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Metadata
Title
Precipitation Strengthening in Al-Ni-Mn Alloys
Authors
Yangyang Fan
Kai Huang
Makhlouf M. Makhlouf
Publication date
11-09-2015
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 12/2015
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-015-3119-6

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