Thixoextrusion of A357 aluminium alloy
The aim of this work is to attempt the application of A357 Al-Si-Mg cast alloy in the thixoextrusion process, evaluating the different forming parameters effect. Thixoextrusion offers several advantages compared with traditional hot-extrusion such as lower pressure, minor friction forces, higher material fluidity and longer tool life. This type of semisolid process requires high solid fraction (0.7＜fs＜1) materials because of its low solidification rate. Aluminium alloy A357 is a commercial cast alloy characterized by high strength, ductility and corrosion resistance. It is commonly used for cast production of automotive components and it is also suitable for semi-solid process, due to its wide range of solidification. A357 aluminium alloy was used as a feedstock for thixoextrusion in order to investigate thixoformability at high solid fraction. A357 alloy with high solid fraction (＞0.85) is less sensitive to temperature drops and allows more stable material flow at higher speeds. To know the forming parameters that improve the mechanical properties of thixoextruded parts, some extrusion tests were carded out. The results were used as the main criteria for assessing the thixoforming viability of the A357 alloy.
thixoextrusion A357 aluminium alloy solid fraction semi-sold
A. FORN G. VANEETVELD J. C. PIERRET S. MENARGUES M. T. BAILE M. CAMPILLO A. RASSILI
Light Alloys and Surfaces Treatment Design Centre (CDAL), Universitat Politècnica de Catalunya (UPC) ThixoUnit, University of Liège, 4, Boulevard de Colonster, 4000 Liège, Belgium
国际会议
北京
英文
1005-1009
2010-09-16（万方平台首次上网日期，不代表论文的发表时间）