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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Cast Shop Technology: Fundamentals of Aluminum Alloy Solidification Joint Session
Presentation Title Effects of Microstructure on Hot Cracking Behavior in Al-Zn-Mg-Cu Alloys
Author(s) David Richard Gildemeister
On-Site Speaker (Planned) David Richard Gildemeister
Abstract Scope An apparatus was developed to cast simulated ingot butts under conditions representative of solidification in commercial-scale DC ingots. The development of the as-cast microstructures of two distinct Al-Zn-Mg-Cu alloys were compared in an effort to determine the reasons for disparate hot-cracking behavior. Metallographic analysis was performed which generated an extensive collection of BSE and EDX map images which were processed using an automated image analysis technique. It was found that solidification rate, zinc and magnesium concentration, as well as silicon and iron concentrations affect the quantity, scale, and constitution of the eutectic structures and porosity. The disparate cracking behavior between the alloys examined was described and explained by the difference in each alloy’s ability to accommodate the strain resulting from solidification.
Proceedings Inclusion? Planned: Light Metals


An Investigation on Si Refinement Mechanism of Hypereutectic Al-Si via Applying Ultrasonic Vibrations
Effective Nanoparticles Feeding Treatment in Casting of A356/ZrO2 Nano-reinforced Composite
Effects of Microstructure on Hot Cracking Behavior in Al-Zn-Mg-Cu Alloys
Homogenization Treatment of High-strength Aluminum Alloy with Casting Processes
Impact of Inlet Flow On Macrosegregation Formation Accounting for Grain Motion and Morphology Evolution in DC Casting Of Aluminium
In-situ Study of Solidification Kinetics of Al-Cu and Al-Ce Alloys with Application of Neutron Diffraction
Observations of Microhardness and Segregation in Al-Zn and Zn-Al Specimens with Columnar-to-Equiaxed Grain Transition
Quantifying Effects of Grain Refiner Addition on Fe-rich Intermetallics Solidification of Al-Si-Cu Alloys Using In Situ Synchrotron X-ray Tomography

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