Two-Step Aging Behaviour of Solution Treated A356 System Alloy

Masahiko Iijima; Tomoya Ozasa; Susumu Ikeno; Kenji Matsuda; Seiji Saikawa

doi:10.4028/www.scientific.net/MSF.941.1083

Paper Titles

Developing Superplasticity in High-Entropy Alloys Processed by Severe Plastic Deformation
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Strain Ratio Effect on the Low Cycle Fatigue Behavior and Microstructure of High-Mn Austenitic Alloy Undergoing the Strain-Induced ε-Martensitic Transformation
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Effect of Sn Content on Heat Resistance of Mg-3%Al-1%Si Alloy for Casting
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Annealing on Anisotropy and Mechanical Properties of an Al-Mg-Si Alloy
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Two-Step Aging Behaviour of Solution Treated A356 System Alloy
p.1083

Cost-Effective Production of High-Property Titanium Alloy from Powder
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Evaluation on Residual Stresses in Thick Titanium Welded Alloys
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Yb: YAG Laser Welding of Aeronautical Alloys
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Relationship between Microstructure and Mechanical Strength of Dental Semiprecious Alloys Subjected to Solution Treatment
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HomeMaterials Science ForumMaterials Science Forum Vol. 941Two-Step Aging Behaviour of Solution Treated A356...

Two-Step Aging Behaviour of Solution Treated A356 System Alloy

Abstract:

Al-7mass%Si-0.3mass%Mg alloy is widely applied to the automotive components, such as road wheel or suspension frame because of having higher ductility and corrosion resistance. Two-step aging behavior of solution treated Al-7mass%Si-0.3mass%Mg system alloy A356 cast into permanent mold and solution treated was investigated by micro-vickers hardness measurement, optical microscopy (OM) and transmission electron microscopy (TEM). The microstructure of as-cast state was consist of primary crystallized α-Al and secondary crystallized eutectic phases. Al-7mass%Si-0.3mass%Mg alloy after casting, the test specimens were heat treated for different pre-aging temperatures at 273K, 348K and 423K for various times after solution treatment at 813K for 36ks. After pre-aging treatment, the test specimens were heat treated for artificial aging at 523K for various times. The peak hardness increased almost the same value when the pre-aging temperature was 273K. On the other hands, positive effect of the final-aging was occurred after pre-aging at 348K and 423K with significantly increasing hardness in the under-aging region. The fine precipitates were observed in the specimen which was final aging at 523K after pre-aging at 348K and 423K.Such a positive effect is considered due to the influence of precipitated phase mainly such as clusters and /or G.P.zone.The present study aims to investigate the effect of pre-aged temperature on final-aged behavior in A356 system alloy.