2017 Technical Division Student Poster Competition: Extraction and Processing Division (EPD) Graduate Students
Sponsored by: TMS Extraction and Processing Division, TMS Functional Materials Division, TMS Light Metals Division, TMS Materials Processing and Manufacturing Division, TMS Structural Materials Division
Program Organizers: TMS Administration

Monday 5:00 PM
February 27, 2017
Room: Hall B1
Location: San Diego Convention Ctr

SPG-1: Additive Manufacturing of Clay Modified with Electric Arc Furnace Steel Dust (EAF Dust): Edisson Ordoņez1; Henry Colorado1; 1Universidad de Antioquia
    This investigation summarizes results from additive manufacturing (AM) of kaolinite clay modified with electric arc furnace steel dust (EAF dust), following the extrusion freeforming (EFF) method. Electric arc furnace (EAF) dust is a hazardous waste available in millions of tons generated by the metallurgical industry. The main goal in this research is to study the use in AM of kaolinite clays modified with EAF dust. Different samples fabricated from clays were built with different water to clay ratios (W/C) and Waste contents between 0.0 and 10.0%. Cylinders for compression tests were printed, then for one day in open air at room temperature, and thereafter exposed to 1100°C for 2 hours in air atmosphere. Materials characterization was conducted with scanning electron microscopy, x-ray diffraction, and other performance tests.

SPG-2: Application of Zr and Ti as Anode Material in Metal-Air Batteries at Elevated Temperatures: Seyed Amirhossein Saeidi1; Emilio Ramirez1; Daniel Mumm1; 1University of California at Irvine
    High energy density of metal-air batteries makes them promising charge storage devices. First principle and statistical mechanic calculations predict that, at temperature as high as 800 ⁰C, Zr and Ti can shuttle oxygen atoms in and out of their hcp crystal structure reversibly as long as x in ZrOx and TiOx is less than 0.5. In this work, we investigate the discharge capacity, reversibility, open circuit voltage and kinetics of Zr and Ti-air batteries at 800 ⁰C. The results of this work show the power of first principal calculations in predicting the properties of materials and how they can help to make new engineering materials.

SPG-3: Beneficiation of Ancylite: Hao Cui1; Corby Anderson1; 1Colorado School of Mines
    Since ancyite, a rare earth strontium carbonate, is a potentially commercial rare earth mineral, this study will provide a comprehensive understanding for surface chemistry of ancylite and indicate a flowsheet for ancylite separation.

SPG-4: Investigation Phase Transformation Route in Mn-Al Alloys: Ozgun Acar1; Ayse Genc1; Yunus Kalay1; Ilkay Kalay2; 1Middle East Technical University; 2Cankaya University
    Mn-Al alloys have a metastable ferromagnetic tau phase which makes them potential candidates for RE-free I magnet applications. This metastable phase forms from a high-temperature epsilon phase as discussed in the literature. Different theories were claimed in terms of the phase transformation sequence of Mn-Al alloys. In this study, the formation of metastable tau phase and its relation with composition was investigated by DSC and in-situ HEXRD at ALBA Synchrotron Source. The effect of epsilon prime phase on the formation of tau phase and the stable phases were discussed in details.

SPG-5: On the Microstructure of Magnesium Alloy AZ91/SiC Metal Matrix Composites: Seyedeh Nooshin Mortazavi1; 1Chalmers University of Technology
    In this research, we analyzed the microstructure of cast magnesium (Mg) alloy AZ91-based metal matrix composites (MMCs). SiC particles were used to reinforce the material investigated. Using various types of analytical tools such as electron energy-loss spectroscopy (EELS) in the transmission electron microscope (TEM). We found several intermetallic particles and reaction products such as Mg hydride (MgH2), MgO, Al2MgC2, Mg2C3, Al4C3, and AlC2. Of these, the hydride phase and one of the carbides (AlC2) have never been reported to form in the microstructure of Mg-based MMCs. Such an precise characterization of the MMCs' microstructure are of great technological/scientific importance for understanding the properties of these class of materials.

SPG-6: SiMn Reduction with Comilog Ore: Trine Larssen1; 1Norwegian University of Science and Technology
    The reduction of manganese oxide (MnO) and silica (SiO2) in the silicomanganese process were investigated with charges based on Comilog ore. The empirical activation energy of MnO from two different SiMn slags between 1500 and 1725◦C were estimated in CO atmosphere at ambient pressure. The produced amount of metal at each evaluated temperature were compared and used to describe Arrhenius plots, which showed that limestone (calcite) has a retarding effect on the reduction of MnO. However, since the difference was small and the charges did not contain the same amounts of raw materials, it was believed that the difference was due to other factors influencing the kinetics, as viscosity or amounts of trace elements. The impact of trace elements were evident when small amounts of iron sulphide were added into the system.

SPG-7: Single Phase Cementite Synthesizes by Mechanical Alloying: Ahmed Al-Joubori1; C. Suryanarayana1; 1University of Central Florida
    Mechanical alloying of Fe-C elemental powder blends was carried out in a high-energy SPEX shaker mill to study phase evolution as a function of milling time. The results of the investigation show that MA can be successfully used for milling of pure Fe and C to synthesize nanocrystalline pure Fe3C with good mechanical properties. In the early stages of milling, supersaturated solid solution of Fe(C) had formed composition and 0.26 wt.% in Fe-7.0 wt.% C composition, and this transformed to Fe and Fe3C phases after 5 h of milling. Sintering of the powders at 600 °C and 70 MPa for 15 min using spark plasma sintering led to fabrication of nanocrystalline bulk steel. A single phase bulk Fe3C, with a very high hardness value 907 HV, could also be produced. Annealing the Fe-7.0 wt.% C sample led to decomposition of Fe3C to -Fe and reduced the hardness value.

SPG-9: Trace Elements Analysis of Ultrahigh-purity Gallium by Direct and Indirect Method: Kyungjean Min1; David Johnson1; Kevin Trumble1; 1Purdue University
    The impurity concentration of Ga should be controlled below 1 ppb to realize electron mobility of 100 million cm2/Vs in GaAs/AlGaAs heterostructure grown in MBE. To determine the impurity concentration in Ga for the heterostructure growth, Inductively Coupled Plasma Mass Spectrometry (ICP-MS) has been performed, which has a theoretical detection limit of sub-parts per trillion (ppt). However, the analysis by ICP-MS had limitations due to the dissolution limit of Ga in the liquid sample, spectral interference and matrix effect. The matrix Ga extraction using an organic solvent is used to overcome the limitations and obtain lower detection limit. Ga extraction method with Methyl ethyl ketone is discussed. In addition, the indirect method of electrical resistivity measurement of Ga is discussed as a complementary method to ICP-MS analysis.