List of Speakers SYMPOSIUM: Light Metals for Transportation

hosted byOctober 27-31, 2013, Montreal, QuebecList of SpeakersRevised: Monday, April 22, 2013SYMPOSIUM:Light Metals for TransportationSignificant efforts have been made by materials scientists and metallurgists to understand the underlying physics involvedin solidification of aluminum alloys to predict shrinkage porosities. Very few previous models for shrinkage predictionconsider the pore formation based on a nucleation and growth basis. The objective of this study was to develop acomprehensive model that can predict shrinkage porosities that are forming during solidification of A356 castings. Themodel utilizes a stochastic approach and takes into consideration the Niyama criterion as well as the nucleation potentialfor formation of pores. Therefore, it can predict the random nature of pore formation during casting solidification.Correlations between the predictions and the pore amount were developed. For this model, literature validation wasprovided for an A356 alloy plate casting. Further validation was performed for a bar geometry cast in a silica sand mold.The model predictions match reasonably well with the experimental measurements.Mechanical Strength at the Interface of a Steel Insert Embedded in an Aluminium Permanent Mold CastingID: 68622Type: ContributedSpeaker: Franco Chiesa, Centre de Métallurgie du Québec (CMQ), CanadaAuthor(s): F. Chiesa, J. Grenier, N. Giguère, F. LanicotAn aluminium skate-board truck including two steel inserts was poured in a permanent mold and the metallurgicalcharacteristics at the interface were investigated. No chemical interaction between the aluminium near-eutectic AlSi13alloy and the steel rods was observed. The mechanical adherence at the aluminium-steel interface was measured forinsert preheating temperatures of 150°C and 350°C. Preheating the insert to a higher temperature was found to enhancethe adherence of the aluminium casting to the steel insert. By modeling filling and solidification, it was possible todetermine the thermal conditions all along the interface. It was found that the adherence increased from 6 to 14 MPawhen the local solidification time at the interface increased from 3s to 15s.Meso-mechanical Modelling on Ridging or Roping of Aluminium AlloysID: 70964Type: StudentSpeaker: Ling Qin, KU Leuven, BelgiumAuthor(s): L. Qin, M. Seefeldt, P. Van HoutteAluminium alloys for automobile body panel application often show a specific type of band-shaped surface rougheningupon stretching, called “ridging” or “roping”. Extensive research has indicated that the evolving surface roughness profilesare related to surface texture patterning. This work presents a ‘Moving window’ method for detecting such texturepatterning based on EBSD orientation maps. The measured EBSD map can be subdivided by the moving window, withinwhich the orientation information is selected to represent the local texture. Then, the full constraint Taylor crystal plasticitymodel is used to simulate the Lankford coefficient (also called r-value) based on texture. By varying the size of the movingwindow in the transverse direction, the texture patterning in terms of the Lankford coefficient can be studied. Two sampleswith different roping tendency are studied in this work.Microstructure and Natural Hardening of AlMg5Si2Mn Casting AlloyID: 70977Type: ContributedSpeaker: Kostiantyn Mykhalenkov, National Technical University of Ukraine "KPI", UkraineAuthor(s): K. Mykhalenkov, V. Boyko, T. Link, N. KorzhovaThe as-cast and heat treated structure of permanent mould and high pressure die castings of the AlMg5Si2Mn alloy hasbeen investigated by differential scanning calorimetry, microhardness measurements, transmission electron microscopyand energy dispersive X-ray analysis. Inside the a-Al grains curved plate-like precipitates were detected for both alloys.Page 9 of 17