The Natural and Artificial Aging Response of Semi-Solid Metal Processed Alloy A356

Heinrich Möller; Gonasagren Govender; Waldo Stumpf

doi:10.4028/www.scientific.net/SSP.141-143.737

Paper Titles

Microstructure and Mechanical Properties of Rheo-Extruded AZ31 Mg Alloy
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Influence of Parameters during Induction Heating Cycle of 7075 Aluminium Alloys with RAP Process
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Fatigue Behavior of Semi-Solid Cast Aluminum: A Critical Review
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Fabrication of Rheological Material of A356 Aluminum Alloy by Electromagnetic Stirring through Vacuum Pump
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The Natural and Artificial Aging Response of Semi-Solid Metal Processed Alloy A356
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Effects of Thixoforming Defects on the Stress-Strain Curves of Aluminum Structural Parts for Automobile
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Symmetry Behavior of Thixoextruded AZ31 Mg Alloy
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Anodizing of A356 T6 Alloys Obtained by Sub-Liquidus Casting
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Effect of Volume Fraction Solid and Injection Speed on Mechanical Properties in New Type Semi-Solid Injection Process
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The Natural and Artificial Aging Response of Semi-Solid Metal Processed Alloy A356

Abstract:

The heat treatment cycles that are currently applied to semi-solid processed components are mostly those that are in use for dendritic casting alloys. These heat treatments are not necessarily the optimum treatments for non-dendritic microstructures. For rheocast alloy A356, it is shown that natural aging prior to artificial aging causes the time-to-peak-hardness to be longer compared to the time when only artificial aging is used. Furthermore, a hardness plateau is maintained during artificial aging at 180oC between 1 and 5 hours without any prior natural aging. A natural aging period as short as 1 hour results in a hardness peak (rather than a plateau) to be reached during artificial aging after 4 hours at 180oC.