Characterization of Minerals, Metals and Materials: Characterization of Polymers and Composites II
Sponsored by: TMS Extraction and Processing Division, TMS: Materials Characterization Committee
Program Organizers: Jian Li, CanmetMATERIALS; Mingming Zhang, Baowu Ouyeel Co. Ltd; Bowen Li, Michigan Technological University; Sergio Monteiro, Instituto Militar de Engenharia; Shadia Ikhmayies; Yunus Kalay, Middle East Technical University; Jiann-Yang Hwang, Michigan Technological University; Juan Escobedo-Diaz, University of New South Wales; John Carpenter, Los Alamos National Laboratory; Andrew Brown, Devcom Arl Army Research Office
Thursday 2:00 PM
February 27, 2020
Room: Theater A-4
Location: San Diego Convention Ctr
Session Chair: Jeongguk Kim, Korea Railroad Research Institute; Zhiwei Peng, Central South University
2:00 PM Cancelled
Unravel the Structure of a Ti-TiB-TiC Intergrowth Phase: a Coupled Ab-initio/HRTEM Investigation: Qi An1; Lujun Huang1; Shaolou Wei2; Atieh Moridi3; Lin Geng1; 1Harbin Institute of Technology; 2Massachusetts Institute of Technology; 3Cornell University
As typical reinforcers to improve the mechanical performances and physicochemical stability of metallic alloys, TiC and TiB have demonstrated promising engineering application and stimulated broad research interest. Especially in titanium alloys, due to technological importance, appreciable effort has been devoted to optimizing their volumetric content and thereby spatial distribution, however, leaving behind the corresponding interfacial structure and property less explored and elusive. In this presentation, by exploiting a TiB+TiC reinforced Ti-alloy as a model system, we report a unique Ti-TiB-TiC intergrowth structure. With the aid of ab-initio modelling and high-resolution transmission electron microscopy (HRTEM), we will demonstrate that the interfacial characteristics of this Ti-TiB-TiC intergrowth phase can be quantitatively revealed. We will systemically discuss: (i) what kind of crystallographic orientation relation presents? (ii) what are the interfacial defect configurations? and (iii) what thermodynamic/kinetic parameters dominate the formation of this unique structure?
2:20 PM
Particle Size Effects on Mechanical Properties of Polymer Bonded Composites for Non-hazardous High Explosive Surrogates: Matthew Herman1; Amanda Duque1; John Yeager1; 1Los Alamos National Laboratory
Non-hazardous surrogates for high explosive (HE) materials, commonly known as “mocks,” are used in situations where the handling of actual HE is impractical or unnecessary. Conventionally, mock materials are manufactured to match only one or two properties of interest for a given HE, limiting their utility as proxies for materials research. Previous efforts to identify a suitable thermal and mechanical mock material for HMX explosive resulted in the selection of 5-lodo-2’-deoxyuridine (IDOX) which has superior properties to current mocks. To match the compressive strength and elastic modulus of HMX plastic bonded explosive (PBX) an investigation of IDOX particle size distribution dependence in formulated mock materials verse mechanical properties was conducted. Additionally, the selected particle size distributions were investigated for their batch to batch reproducibility and a pressing study to determine process/property relationships between the new mock PBX and the conditions under which it is pressed. LA-UR-19-26015
2:40 PM
Modeling and Characterization of Reflection, Absorption, and Scattering in Polycrystalline Materials: Meir Shachar1; Gottlieb Uahengo1; Elias Penilla1; Matthew Duarte1; Yasuhiro Kodera1; Javier Garay1; 1University of California, San Diego
Explaining in-line transmission data from polycrystalline transparent ceramics is challenging because reflection, absorption, and scattering losses occur simultaneously. Ideally, reflection losses reveal information about the material’s surface and average refractive index, absorption losses reveal the material’s energy levels, and scattering losses reveal the material’s microstructure. However, interpretation of transmission data is obscured by the inability to differentiate between the types of losses. Two methods are explored for decoupling reflection, scattering, and absorption in materials that have all three loss types. The first method is a least-squares fitting approach which models transmission losses. The second method is a characterization technique which uses angle-dependent transmission to measure scattering and reflection losses. The advantages and limitations of these methods are explored. Both methods are applied to measured spectroscopy data on multiple material systems (ruby, zirconia, terbia, etc.) and their extracted absorption cross-sections are shown.
3:00 PM Cancelled
Characterization of Brazilian Peat, Clay and Diatomite Blends for Use as Organic Compounds Adsorbents: Tatiana Costa1; Francisco Valenzuela-Diaz2; Maria das Graças Da Silva-Valenzuela2; Jéssica Arjona2; 1Universidade De Sao Paulo; 2USP
Nowadays, the use of low-cost adsorbents, such as peat, appears like a good strategy concerning environmental protection. This material has been described as an important alternative because of its good performance and abundance worldwide. The objective of this study was to characterize peatlands sample of a reservoir located in the northern of Espirito Santo state, Brazil. The sample as received was combined in a mix by addition of clay (MMT) and diatomite (DIA) in different fractions to generate blends of different compositions. These different blends were analyzed to be applied as hydrocarbon spills adsorbents. The obtained mixtures were characterized by XRD, SEM and TGA, also were verify the degree of decomposition and ash content of them. To identify the blend with higher sorption capacity were performed the sorption tests on ASTM F726-99 and F716-26152 standards.
3:20 PM Break
3:35 PM
Microstructure Dependent Thermal Conductivity Measurement of Zircaloy-4 Using an Extended Raman Thermometry Method: Hao Wang1; Abhijeet Dhiman1; Vikas Tomar1; 1Purdue University
In this work, by introducing a thin silicon coating on the sample surface, the Raman thermometry method was extended to metallic sample measurements. A heat transfer model for samples with a thin coating layer was derived. Combining this heat transfer model with the Raman thermometry method, experiments were performed to measure localized spatially resolved thermal conductivity of zircaloy-4 samples.The local thermal conductivity values showed increase with increase in grain size. Nanoindentation based elastic modulus maps showed the exact same location specific variation as the microstructure dependent thermal conductivity variation indicating a possibility that room temperature thermal conductivity in zircaloy-4 is phonon dominated.
3:55 PM
Preparation and Characterization of Modified Polymer Fibers Membrane with β-cyclodextrin and its Adsorption Properties: Aiying Zhang1; Xiang Wang1; Jiale Yang1; Ning Gao1; Zengguo Feng2; 1School of Materials Science and Engineering, Beijing Institute of Technology; 2Beijing Institute of Technology
β-cyclodextrin (β-CD) can form a unique host-guest inclusion complex with organic molecules due to the suitable cavity size and specific molecular recognition. It can be used as an adsorption material to purify the polluted water. However, the well water solubility of β-CD restricts its in-depth application in water systems. Therefore, it is considered that β-CD can be introduced into an electrospun fibers membrane with relatively high specific surface area to synergize the advantage of the cyclodextrin and the electrospun membrane to acquire an easily removable composite adsorbent. Herein, the axial polyacrylonitrile fibers membrane and the coaxial fibers membrane of polyvinylidene fluoride@ polystyrene, containing β-CD were prepared by using the method of electrospinning respectively. Adsorption capacity of organic molecules of the functionalized fibers membrane were investigated. Further analysis demonstrated that remarkable adsorption capacity towards organic molecules was ascribed to the formation of inclusion complexes with β-CD to some extent.
4:15 PM Cancelled
Fabrication of Ultra-high Molecular Weight Polyethylene Membrane and Evaluation of Physical Characteristics for Wastewater Treatment: Shanshan Xie1; Zhangfu Yuan1; Yuantao Shi1; 1University of Science and Technology, Beijing
A porous tubular-type ultrahigh molecular weight polyethylene (UHMWPE) membrane with good filtration effect for turbid circulating water was designed and prepared. The physical-chemistry properties such as surface microstructure and tensile strength of tubular-type UHMWPE membrane were investigated. UHMWPE membrane consists of agglomerated particles with diameters of 127-229 um. The UHMWPE membrane has a porous structure with pore diameter of 40-152 μm, which can enhance the permeability of UHMWPE membrane. The accumulation and distribution of oxide scale particles in UHMWPE membrane after having been used for 5 years were also analyzed. Oxide scale particles are mainly accumulated on the surface layer of UHMWPE membrane. And the fouling layer is about 2.052 mm. The accumulation of oxide scale particles decreases with the increase of distance from the inner surface of the UHMWPE membrane. The accumulation is about 0.96% at L=0.342 mm, and the accumulation is about 0.36% at L=2.052 mm in the UHMWPE membrane. UHMWPE membrane exhibits excellent antifouling property for long-term use.