Abstract
The precipitation sequency of two casting alloys, namely the A356 and A357 AlSiMg, and the corresponding composites reinforced by 20% of Al 2 O 3 have been studied by joint DSC and TEM in the underaged T6 state. Being Mg, combined with Si, the main hardening element of such alloys, it's actually interesting to monitor the phase transformations due to both the difference in Mg concentration in the monolithic alloys and to the possible Mg segregation in the composites. It has been verified that the precipitation sequency in the monolithic alloys occurs through the formation of β, β' and Si; a minor Si precipitation is observed in the alloy containing more Mg, due to the lower amount of free Si available. In the corresponding composites, the homogeneous nucleation of β is largely suppressed, and β' precipitates are forming in limited quantity. A higher density of β' is observed in the composite more rich in Mg, and Si particles are present in both the materials.The age hardening response of the materials is discussed in view of the suppression of pre-precipitate solute clustering processes.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
