Publication: Effect Of Secondary Plastic Deformation On The Microstructures And Mechanical Properties Of Cast Ai-7Si-Mg Alloy
Date
2014-12
Authors
Thuong, Nguyen Van
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The purpose ofthis research is to study microstructure and hardness of AI-7SiMg alloy under different cooling slope casting conditions and equal channel angular pressing (ECAP). The effect of cooling slope casting method with varying variables, such as pouring temperature (625°C - 640°C - 660°C - 680°C), cooling slope length (150 mm - 250 mru- 350 mm) and cooling slope temperature (room temperature - 200°C - 400°C) and conventional casting method are investigated. The as-cast alloys and as-ECAPed alloys were analyzed based on Differential Scanning Calorimetry, Xray fluorescence, microstructures, hardness, X-ray Diffraction pattern, wear resistance, Secondary Electron Microscope and Energy Dispersive X-ray. Microstructure of conventional cast alloy cast at pouring temperature of 640°C was coarse and almost dendrite the structure. However, uniform, fine and globular microstructure could be obtained from cooling slope casting with pouring temperature range of 625°C - 660°C, cooling slope length range of 150 mm - 350 mm and slope temperature ranging from room temperature to 200°C_ This is due to copious nucleation occurred on slope surface and these nuclei were then detached due to the force convection during pouring process.
Description
Keywords
Effect Of Secondary Plastic Deformation , Properties Of Cast Ai-7Si-Mg Alloy