دراسة خواص الزحف للمواد المتراكبھ ذات أساس (Al-Mg-Si) مقواة بدقائق من كربید السلیكون

Abstract

The aim of this work is to study the deformation behavior of (Al-Mg-Si) alloy reinforced with silicon carbide at elevated temperature under creep.In this research both matrix-alloy and composite material were preparedusing stir-cast technique. The cast specimens were deformed using rollingprocess and then heat treatment was done for both matrix alloy andcomposite material Creep test were done at (١١٠،٢٤٠،٣٢٠) ºC used stresses(٩,٧, ١٩,٤) MPa for master alloy and stresses (٣٨,٤, ٥٧,٧) MPa for compositematerial.The composite material reveals lower steady state creep rate than matrixalloy especial at low temperature so it is possible to conclude that compositematerial has better creep resistance than matrix alloy.Scanning electron microscope result of fracture section showed that voidare formed near silicon carbide and near second phase which indicates thatthe failure in composite material began by forming voids which connecttogether to form cracks which expended leading to failure.