Hypereutectic aluminum-silicon alloy 390 offers properties akin to composite material exhibiting outstanding wear characteristics, excellent high temperature strength, a high modulus of elasticity and a low thermal expansion coefficient. These properties make 390 a promising candidate for heavy wear conditions. Liquid casting with 390, however, poses several problems thus making semi-solid processing an attractive alternative. In this study, a motorcycle sprocket was semi-solid metal (SSM) cast with A390. The resulting mechanical behaviour and wear resistance was promising for parts that will undergo heavy wear applications. Use of this alloy in semi-solid production should prove to be an attractive alternative for automotive engineers. The goal of the project was to examine whether semi-solid cast alloy A390 would be a suitable process to produce a motorcycle drive sprocket. Currently the sprocket is produced from semi-solid cast 357, but the teeth need be chromium plated to provide adequate wear resistance. Sprockets have been semi-solid metal cast from alloy A390. Dimensional measurements indicated that the A390 casting obtained the crucial dimensional requirements of the sprocket. Examination of the microstructure revealed a very uniform distribution of relatively fine (10 to 40 micron) primary silicon particles. In addition, the SSM cast A390 sprockets contained essentially no porosity. Measurements of the mechanical properties indicated that the SSM cast A390 sprockets have sufficient strength to meet requirements required in service. The fatigue and wear resistance of the sprockets wa not measured, but information from the literature indicated that the A390 sprockets might meet the requirements of the part. Additional testing would be required to fully evaluate the fatigue and wear performance of the semi-solid cast A390 sprockets.
Semi-solid processing of aluminum alloy A390
Flüssig-fest-Prozeß für die Aluminiumlegierung A390
2002
7 Seiten, 9 Bilder, 2 Tabellen, 5 Quellen
Conference paper
English
AlSi-Legierung , Aluminiumlegierung , Autoindustrie , Bruchdehnung , Dehngrenze , Elastizitätsmodul , Gusslegierung , Maßgenauigkeit , mechanische Eigenschaft , Mikrogefüge , Schwingfestigkeit , thermischer Ausdehnungskoeffizient , Thixocast-Verfahren , übereutektische Legierung , Verfahrensparameter , Verschleißwiderstand , Zugfestigkeit
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