MATEC Web Conf.
Volume 326, 2020The 17th International Conference on Aluminium Alloys 2020 (ICAA17)
|Number of page(s)||7|
|Published online||05 November 2020|
Quench Sensitivity and Phase Transformation Kinetics of AlSi7MnMg High Pressure Vacuum Die Casting
1 Department of applied science, University of Quebec at Chicoutimi, Saguenay, QC, Canada, G7H 2B1
2 Arvida Research and Development Centre, Rio Tinto, Saguenay, QC, Canada, G7S 4K8
* Corresponding author: firstname.lastname@example.org
The quench sensitivity of an AlSi7MnMg alloy in high-pressure vacuum die (HPVD) casting was investigated by time-temperature-transformation and time-temperature-property diagrams with an interrupted quench technique. The quench sensitive temperature range of the alloy is from 260 to 430 °C and its nose temperature is 350 °C. The mechanical strength versus cooling rates of the HPVD casting was predicted using quench factor analysis method and veriﬁed by experimental results. The critical cooling rate is 6 °C/s to remain 95% of the maximal mechanical strength. The coefﬁcients k2 - k5, related to the nucleation and precipitation kinetics of TTP curves, and phase transformation diagrams were determined. The precipitation of Mg2Si phase in the castings was observed during isothermal treatment using transmission electron microscope. Moreover, the quench sensitivity and kinetics of the phase transformation of AlSi7MnMg alloy and AlSi10MnMg alloys were compared. It reveals that the quench sensitivity and phase transformation rate of the former are lower than that of the latter.
© The Authors, published by EDP Sciences, 2020
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