Use of Thixoforming as a Manufacturing Method for Metallic Composites
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Use of Thixoforming as a Manufacturing Method for Metallic Composites Hüsnügül Yilmaz Atay1 · David Aišman2 · Hana Jirková2 · Mária Behulova3 · Bohuslav Mašek2 Received: 22 February 2019 / Accepted: 10 July 2019 © The Korean Institute of Metals and Materials 2019
Abstract Thixoforming is one of the members of the family of semi-solid forming processes. It is possible to obtain complex shape of materials by this method and unconventional microstructures can be achieved due to its thixotropic properties. However, in this study thixoforming was used not only as forming method but also as a manufacturing method. Metallic composites were manufactured by a process of integration of powder metallurgy and semi-solid production technique. The mixture of Co72.5B15Si12.5 alloy and Fe powders become partially melted, compressed mechanically in semi-solid state and filled intricate cavities. Without changing alloy structure, it could be possible to reinforce it with Fe powders. Moreover, the final shape of the product could be achieved at the same time. Prior to the process, Co72.5B15Si12.5 alloy obtained in the form of stick was characterized by X-ray diffraction (XRD), scanning electron microscopy–energy dispersive spectroscopy (SEM–EDX), differential thermal analysis-thermogravimetry (DTA-TG), light microscope and micro-hardness machine. The stick was milled to get alloy powders and they were blended with iron. Characterization of the structures of the composite material was performed. It was concluded that the heating process of iron and alloy powders provides the formation of compact metal matrix composites. Keywords Manufacturing · Forming · Thixoforming · Metal matrix composites
1 Introduction Practical applications in metal forming have been made from the ancient centuries for 1000 years. In the prehistorical time, the ductile materials like gold and silver were used to produce thin sheets of valuable metals by cold working. They were hammered with stones and they were attained subtle sheets. Starting with the progression of the rolling mill, the sheet metal production breakthrough was transpired. The first known of a rolling mill was designed by Leonardo. His one of the drawings dated 1480 depicted in Fig. 1. With this drawing, it was described for the first time * Hüsnügül Yilmaz Atay [email protected] 1
Department of Materials Science and Engineering, İzmir Katip Çelebi University, 35620 İzmir, Turkey
2
The Research Centre of Forming Technology, University of West Bohemia, 306 14 Pilsen, Czech Republic
3
Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, 917 24 Trnava, Slovakia
modifying the thickness by making a material pass between two cylindrical rollers with parallel axes [1–3]. In the modern life, forming can be simply defined as fabricating the plastic modification of a shape while keeping the mass and cohesion of the material. Additionally, the modification of a shape is performed with controlled geometry, thus forming differs from defo
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