The high temperature fatigue behaviour of secondary AlSi7Cu3Mg alloys has been investigated. The alloy has been solubilized and aged for different times to obtain the age-hardening profile. The peak hardness is reached at 180 °C after 4 h ageing treatment. Further, the hardness stabilizes showing a plateau in the range between 5 and 10 hours of ageing treatment. The heat treatment leads to a complete dissolution of Cu-rich phases, spheroidization of eutectic Si particles and precipitation inside the α-Al matrix. Several fatigue tests have been carried out on selected heat-treated specimens both at room and elevated temperatures (200 and 300 °C). The obtained results show how the fatigue strength decreases with increasing the testing temperature
High Temperature Fatigue Behaviour of Secondary AlSi7Cu3Mg Alloys
De Mori, Alessandro
Writing – Original Draft Preparation
;Timelli, GiulioWriting – Review & Editing
;
2019
Abstract
The high temperature fatigue behaviour of secondary AlSi7Cu3Mg alloys has been investigated. The alloy has been solubilized and aged for different times to obtain the age-hardening profile. The peak hardness is reached at 180 °C after 4 h ageing treatment. Further, the hardness stabilizes showing a plateau in the range between 5 and 10 hours of ageing treatment. The heat treatment leads to a complete dissolution of Cu-rich phases, spheroidization of eutectic Si particles and precipitation inside the α-Al matrix. Several fatigue tests have been carried out on selected heat-treated specimens both at room and elevated temperatures (200 and 300 °C). The obtained results show how the fatigue strength decreases with increasing the testing temperature
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