The influence of Cu content (0, 0.5 and 1 wt%) on the nature of intermetallic phases was carefully investigated in a AlSiMg casting alloy. Four different Cu-bearing phases, with a Cu content ranging from 5% to 30%, were identified by Energy Dispersive Spectroscopy. The Al-Mg-Si-Cu quaternary phase was found coupled to Si particles and the Ө-Al2Cu to brittle β-Al5SiFe phase. Copper modified the stability and the dissolution kinetics of iron-bearing intermetallics (π-Al8FeMg3Si6 and β-Al5SiFe) during solution treatments at 773 and 803 K (500 and 530 °C). In 0% Cu and 0.5% Cu samples, (β+ π) area fraction decreases with time, while it remains almost constant and comparable at the end of two solution treatments in 1% Cu samples. Moreover, the Q-Al5Cu2Mg8Si6 and Mg2Si intermetallic area fraction increased with copper (in 0.5 and 1% Cu samples) especially at the highest temperature of investigation (803 K - 530°C) and slightly decreased with time.

A study of intermetallic phase stability in Al-Si-Mg casting alloy: The role of Cu additions / Cerri, E.; Di Giovanni, M. T.; Ghio, E.. - In: LA METALLURGIA ITALIANA. - ISSN 0026-0843. - 112:7-8(2020), pp. 37-47.

A study of intermetallic phase stability in Al-Si-Mg casting alloy: The role of Cu additions

Cerri E.
;
Ghio E.
2020

Abstract

The influence of Cu content (0, 0.5 and 1 wt%) on the nature of intermetallic phases was carefully investigated in a AlSiMg casting alloy. Four different Cu-bearing phases, with a Cu content ranging from 5% to 30%, were identified by Energy Dispersive Spectroscopy. The Al-Mg-Si-Cu quaternary phase was found coupled to Si particles and the Ө-Al2Cu to brittle β-Al5SiFe phase. Copper modified the stability and the dissolution kinetics of iron-bearing intermetallics (π-Al8FeMg3Si6 and β-Al5SiFe) during solution treatments at 773 and 803 K (500 and 530 °C). In 0% Cu and 0.5% Cu samples, (β+ π) area fraction decreases with time, while it remains almost constant and comparable at the end of two solution treatments in 1% Cu samples. Moreover, the Q-Al5Cu2Mg8Si6 and Mg2Si intermetallic area fraction increased with copper (in 0.5 and 1% Cu samples) especially at the highest temperature of investigation (803 K - 530°C) and slightly decreased with time.
A study of intermetallic phase stability in Al-Si-Mg casting alloy: The role of Cu additions / Cerri, E.; Di Giovanni, M. T.; Ghio, E.. - In: LA METALLURGIA ITALIANA. - ISSN 0026-0843. - 112:7-8(2020), pp. 37-47.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2889643
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