List of Speakers SYMPOSIUM: Light Metals for Transportation

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hosted byOctober 27-31, 2013, Montreal, QuebecList of SpeakersRevised: Monday, April 22, 2013SYMPOSIUM:Light Metals for Transportationpunch-die clearances, lubrication, blank dimensions and shapes for both circular pots and rectangular boxes areillustrated. The pioneering multiple draws for very deep cylinders combined with sidewall ironing has made possiblebeverage cans. The problem of earring in anisotropic sheet and the development of hot rolling schedules for isotropic stripis explained. History is traced to iron frying pans and armor.Design of Precipitation Strengthened Al-Sc-Zr-X Alloys Characterized by High-Temperature HardnessID: 73370Type: StudentSpeaker: Matthew Wong, Michigan Technological University, USAAuthor(s): M. Wong, P. SandersPrecipitation hardening for high-temperature applications can be achieved through the addition of small amounts ofscandium and zirconium to nearly-pure aluminum. Designed “mixture” experiments using thermodynamic databases wereutilized to optimize precipitation hardening in Al-Sc-Zr alloy systems through the additions of a fourth alloying element.The strategy was to increase the age hardening response by optimizing the solvus line bordering the single-phase alphaaluminumregion. Samples prepared by arc-melting and isochronal aging were characterized by high-temperaturehardness to quantify precipitation strengthening. Exploration of new low-alloy aluminum systems may introduce improvedhigh-temperature properties and lead to improvements in thermodynamic databases related to Al-Sc-Zr-X alloy systems.Development of Steel/Mg Alloy Multilayered Composite by Reactive Transient Liquid Phase Bonding MethodID: 72573Type: ContributedSpeaker: Shoichi Nambu, The University of Tokyo, JapanAuthor(s): S. Nambu, N. Kyokuta, M. Ojima, J. Inoue, T. KosekiA multilayered composite consisting of ductile steel and Mg alloy was developed in order to achieve novel structuralmaterials having higher specific strength and ductility combination. To produce the composite, the authors developed anew bonding method called reactive transient liquid phase (r-TLP) bonding method, which uses an eutectic melt of Mg-Agfor TLP process and enables to produce a very thin and uniform intermetallic compound layer at interface between steeland Mg alloy through the melt. High bonding strength above the yield strength of Mg alloy was obtained by the r-TLPbonding method. Furthermore, multilayered composite of AISI304 stainless steel and AZ31 Mg alloy was fabricated usingthe r-TLP bonding, and was found to have improved specific strength and ductility combination above 4000 kNm%/kg.Different Effects of Neodymium and Strontium on the High Temperature Oxidation and Ignition Resistance ofPure MagnesiumID: 72661Type: ContributedSpeaker: Deniz Aydin, McGill University, CanadaAuthor(s): D. Aydin, M. PekguleryuzThe high temperature oxidation and ignition behavior of binary Mg-Nd and Mg-Sr alloys were investigated. Differenteffects of Nd and Sr were observed via continuous heating experiments carried out in dry air-flow. The ignitiontemperature (Ti) increased with increasing Sr from 640 oC (of pure Mg) to up to 854 oC at 6 wt% Sr. The change in Tiwas related to the surface segregation of Sr and to the activity of the elements in the surface in the pre-ignition stage. Nd,on the other hand, increased the ignition temperature to only 770 oC at 0.5 wt% Nd with higher amounts of Nd notproducing further increase in Ti. It has been found that the formation of compact MgO-Nd2O3 surface scale on Mg-Ndalloys increases the oxidation and ignition resistance of pure Mg but the surface scale degrades in prolonged exposure.Page 4 of 17
hosted byOctober 27-31, 2013, Montreal, QuebecList of SpeakersRevised: Monday, April 22, 2013SYMPOSIUM:Light Metals for TransportationEffect of Iron and Sr in the evolution of Iron based intermetallic Phases in Al-Si hypoeutectic alloysID: 72811Type: ContributedSpeaker: Sumanth Shankar, McMaster University, CanadaAuthor(s): A. Gorny, J. Manickaraj, S. ShankarThe main aim of the study is to understand the formation of the iron bearing intermetallic phases and the effect of Sraddition on them in the Al-Si hypoeutectic alloys. This study has methodically characterized the iron based intermetallicphases evolving during solidification of the Al-7 wt%Si binary alloy as a function of composition of Fe (0.1,0.2, 0.35,0.5and 0.8 wt%), Sr (0 and 200 ppm) and cooling rates (0.1, 1 and 50 K/s). The samples were analyzed by using the thermaldata obtained during solidification and various microscopy techniques. The Al-Si-Fe intermetallic phase compositionswere analyzed by Energy Dispersive X-Ray Spectrometer (EDX) and it was observed that there is anomalous evolution ofcertain Al-Si-Fe intermetallic phases in both alloys with and without Sr addition. The phases evolving in alloys without Sris different from that with Sr in them.Effect of Texture on Precipitation Kinetics in Aluminum AlloysID: 72373Type: ContributedSpeaker: Kaustubh Kulkarni, IIT Kanpur, IndiaAuthor(s): S. Mishra, N. Gurao, S. Shekhar, K. KulkarniControlling the orientation of precipitates can potentially improve the strength of an alloy in a desired direction.Development of texture through thermomechanical processing can affect the nucleation and growth kinetics ofsemicoherent precipitates that cause age hardening in aluminium alloys. In order to understand the effect of texture onage hardening kinetics, wrought aluminium alloys were thermo-mechanically processed to develop various types oftextures in the alloys. The age hardening treatments are carried out on these alloys at different temperatures and times.Tensile tests were carried out on specimens drawn in different directions with respect to the rolling direction to estimatethe evolution of anisotropy in mechanical properties. A detailed analysis of microstructure as well as bulk and microtexture was carried out to establish a relationship between crystallographic texture and precipitation kinetics. This study isexpected to enable development of processing pathways for controlling the strength of age-hardened alloys in specificdirections.Elevated Temperature Wedge Compression Testing of Precipitation Hardenable Al-Sc-Zr AlloysID: 71649Type: StudentSpeaker: Cameron McNamara, Michigan Technological University, USAAuthor(s): C. McNamara, S. Kampe, P. Sanders, D. SwensonEfficient precipitation strengthening and kinetic stability can be obtained in nearly-pure aluminum through the combinedaddition of fractional percentages of scandium and zirconium. The trialuminide precipitation sequence in these alloys canbe tailored through deformation processing and artificial aging. This work utilizes wedge-shaped compression samples ofcast Al-Sc-Zr as a means to produce a continuous plastic strain gradient to examine the role of deformation onmicrostructural evolution. The samples exhibit a radial distribution of plastic strain, and will be compressed at elevatedtemperatures to facilitate in-situ precipitation. Strengthening is quantified via microhardness mapping and microstructuralobservations; these data will be correlated with a finite element analysis (FEA) of the strain distribution. Thisexperimentation is performed as an analog to controlled rolling, a method of reducing cost in the steel industry throughconcurrent deformation processing and precipitation strengthening. This work is sponsored by the Office of NavalResearch, grant No. N00014-11-10876.Page 5 of 17
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