General Poster Session: Advanced Materials
Program Organizers: TMS Administration

Tuesday 5:30 PM
February 25, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr


J-137: Advanced Manufacturing of High Density Reactive Materials: Chris Haines1; Matthew Beyard2; 1US Army CCDC - Army Research Laboratory; 2Office of Naval Research - Code 35
    Conventional casing and warhead materials for small-to-large caliber ammunition are primarily made of steel or other metal alloys. These materials are inert and are generally manufactured using traditional manufacturing technologies (powder metallurgy, extrusion, casting, etc.). Reactive materials are a totally different class of materials typically comprised of combustible metals as constituents. These materials require advanced manufacturing technologies to assure not only safe handling, but also preservation of the stored chemical energy which lead to their enhanced performance. We will discuss three (3) advanced manufacturing strategies being evaluated for realization of fully dense HDRM, namely: Instrumented – Hot Isostatic Pressing (i-HIP), Field Assisted Sintering Technology (FAST), and Cold Spray. We will discuss the technical challenges associated with sintering/consolidation of these materials, and highlight the pros and cons or each of these discreet manufacturing technologies in addressing those challenges.

J-138: Developing Continuous and Multi-step Strain-annealing Processes for Fe-based Amorphous Magnetically-soft Inductor Cores: Nickolaus Bruno1; Ronald Noebe2; Alex Leary2; Vladimir Keylin2; Grant Feichter2; 1South Dakota School of Mines and Technology; 2NASA Glenn Research Center
    The performance of low-carbon emission and high-efficiency hybrid-electric aircraft propulsion systems is controlled through electrical components including filter inductors, transformers, and motor cores. These devices direct and store electromagnetic energy, and their operating efficiency is governed by the structure of soft magnetic alloys that couple internal electromagnetic fields. The research, presented here, includes quantifying pertinent mechanical properties in brittle Fe-based FINEMET-type ribbons for the design of a continuous strain-annealing process. During the process of strain-annealing, we aim to control magnetic coercivity, anisotropy, and relative permeability in advanced FINEMET compounds. Moreover, to reach new relative magnetic permeabilities in Fe-based alloys, we investigate the effect of field-annealing following a continuous strain-annealing process in Fe-2Nb-2Mo-1Cu-15.5Si-7B at. % melt-spun ribbons.

J-139: Effect of Mechanical Alloying Parameters on Fienemet Alloys Processed by Spark Plasma Sintering: Taban Larimian; Rajeev Kumar Gupta1; Varun Chaudhary2; Raju Ramanujan3; 1The University of Akron; 2School of Materials Science & Engineering, Nanyang Technological University; 3Nanyang Technological University
     Finemet (Fe73.5Cu1Nb3Si13.5B9) is an iron-based softmagnetic alloy that has excellent magnetic properties such as high permeability and saturation magnetization as well as low coercivity. The influence of mechanical alloying (MA) parameters and Spark Plasma Sintering (SPS) process on microstructure, mechanical properties and magnetic properties of Finemet alloys is investigated in this research work. Finemet powder was milled for 30, 60, 90, and 120h with ball to powder ratio (BPR) of 10:1 and 15:1. The milled powder was consolidated using the SPS process. Furthermore, coercivity and saturation magnetization as well as microhardness of the samples were measure in order to investigate the role of MA parameters on magnetic and mechanical properties of the alloys. Moreover, microstructure was studied by Scanning Electron Microscop (SEM) analysis and X-ray Diffraction (XRD) was conducted on milled powders as well as sintered alloys in order to investigate the phases present before and after the sintering occurs.

J-140: Influence of Solution Heat Treatment on the Microstructures and Mechanical Properties of TC4 Alloy Prepared by SLM: Shifeng Liu1; Zhichang Zhang1; 1Xi’an University of Architecture and Technology
    TC4 alloy was prepared by Selective Laser Melting (SLM) with near-full 98.7% density. The microstructures of the sample before and after heat treatment were analyzed. The as-deposited sample showed an epitaxial growth along the building direction. Almost all non-equilibrium fine α' phase was found in the sample.After the solution heat treatment of the TC4 alloy sample, the structure is transformed into the equilibrium phase α and roughened into a strip shape. The mechanical properties of TC4 alloy before and after heat treatment were tested.The tensile strength of the as-deposited samples was 1291±20 MPa, and the plastic elongation was 2.2±0.7%. The fractures showed typical patterns of brittle fractures with river-like and stair-like steps. The tensile strength of the sample after heat treatment decreased by about 200 MPa, the elongation increased by about 10%, and the fracture morphology changed into tiny dimples.

J-141: Modelling and Neutron Diffraction Characterization of the Interface Bond Integrity of Spray Formed Dissimilar Steel Clad Systems: Tung Lik Lee1; J. Mi2; S. Ren3; S. Zhao3; J. Fan3; S. Kabra1; P. Grant4; 1UK Research and Innovation (STFC); 2University of Hull; 3Baosteel; 4University of Oxford
     Spray forming of thick dissimilar steel clad tubes can yield optimal combinations of mechanical and functional properties provided by the constituent materials with improved service lives and higher cost efficiency than conventionally cast monolithic components. Although significant progress has been made on the spray forming aspects of clad products, there has been limited progress on understanding how to promote interfacial bonding between the substrate and spray formed cladding important for downstream thermo-mechanical processing. High wear resistance tool steel was spray formed onto mild steel tubes with different substrate and spray temperatures. The interfacial bond integrity was quantitatively assessed by comparing the simulated residual stress distributions across the cladding-substrate interface with neutron diffraction measurements and the differences were used to infer the load transfer behaviour and thus the mechanical integrity of the interface.The link between process parameters and the resulting microstructures, residual stress and integrity of the interface was revealed.