Microstructural Evolution of AZ91 Alloy Containing 3%Ca Prepared by Cooling Slope

Ali Khosravani; Hossein Aashuri; P. Davami; A. Narimannezhad; A. Foroughi; M. Kiani

doi:10.4028/www.scientific.net/SSP.141-143.427

Paper Titles

Melt Conditioned Direct Chill Casting (MC-DC) of Wrought Al-Alloys
p.403

Rheological Behavior of Semi-Solid Slurry of A356 Alloy at High Shear and Cooling Rates
p.409

A New Processing Route for As-Cast Thixotropic Steel
p.415

The MSMT Process for Semi-Solid Slurry Production
p.421

Microstructural Evolution of AZ91 Alloy Containing 3%Ca Prepared by Cooling Slope
p.427

Evaluation of Surface Chemical Segregation of Semi-Solid Cast Aluminium Alloy A356
p.433

Mechanical Analysis of Semi-Solid Metals Shear Deformation during Compression
p.439

A Novel Process for Fabrication of Globular Structure by Equal Channel Angular Pressing and Isothermal Treatment of Semisolid Metal
p.445

Development of Non-Dendritic Microstructure of Aluminum Alloy in Semi-Solid State under Ultrasonic Vibration
p.451

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Microstructural Evolution of AZ91 Alloy Containing 3%Ca Prepared by Cooling Slope

Abstract:

Globulization of the grain refined AZ91 magnesium alloy with Ca on a cooling slope was investigated. Dendritic morphology of the grains was transferred into round and well distributed small particles as a result of grain-refinement effect of Ca in the alloy. Semi-solid holding of the alloy was carried out at different temperatures to improve the spherecity of the globules. Results show that, remelting at 540 °C for 30 min provides the best shape factor for the alloy. The study of coarsening kinetic in this alloy showed lower growth rate alternative other research which used same condition for produce semi-solid billet just in using Ca.