Metal-Matrix Composites: Advances in Processing, Characterization, Performance and Analysis: Techniques Related to Metal-based Composite Materials
Sponsored by: TMS Structural Materials Division, TMS: Composite Materials Committee
Program Organizers: Srivatsan Tirumalai; Pradeep Rohatgi, University of Wisconsin; Simona Hunyadi Murph, Savannah River National Laboratory
Wednesday 8:30 AM
March 2, 2022
Room: 256B
Location: Anaheim Convention Center
Session Chair: Tirumalai Srivatsan, The University of Akron
8:30 AM Invited
Effects of Oxide Ceramic Addition on Biocompatibility of Titanium: Sushant Ciliveri1; Indranath Mitra1; Susmita Bose1; Amit Bandyopadhyay1; 1Washington State University
Porous metal coatings on Ti metal implants play a vital role in surrounding bone tissue integration and enhance osseointegration at the surface of the implants, thus, reducing patient recovery time. At the same time, infection prevention at the implant site is of prime importance to reduce the possibility of revision surgery. The inorganic phase of the bone contains macro-nutrients in trace elements such as Mg2+, Si4+, etc., which play a vital role in bone formation and remodeling. The addition of SiO2 and MgO in trace amounts into porous Ti surface coating is expected to promote angiogenesis and osteogenesis, enhancing tissue integration, regeneration, and osseointegration in vivo beyond what bulk Ti material can offer. Copper is known to have antibacterial properties. It is expected that the addition of copper in trace amounts would help prevent primary and secondary infections on the implant surface without causing cytotoxicity in vivo.
8:55 AM Invited
Micro-scale In-situ Mechanical Testing and Nano-CT Characterization of Directed Energy Deposited Hybrid Al/Al3Ni Composite Foam Materials: Baolong Zheng1; Xin Wang1; Dongxu Liu1; Lizhi Sun1; Enrique Lavernia2; Julie Schoenung1; 1University of California, Irvine; 2National Academy of Engineering
A hybrid Al+Al3Ni composite foam was synthesized in situ via directed energy deposition (DED) of Ni-coated Al6061 powder, in the absence of a foaming agent. During DED processing, the Ni coating reacted with the Al matrix, resulting in the simultaneous formation of a fine dispersion of Al3Ni intermetallic compounds, and a high-volume fraction of pores. The microstructure evolution was characterized with electron microscopy (SEM, TEM), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS). The distribution and fraction of pores and Al3Ni phases in as-deposited foams were identified with X-ray computed tomography (XCT). We also used focused ion beam to prepare micron-sized pillars containing pores and Al3Ni intermetallic phases in the Al matrix, and evaluated the mechanical behavior in micro-compression. The deformation behavior of the pores, Al3Ni and the Al matrix was observed and was used to interpret the balance of enhanced strength and ductility of this hybrid Al+Al3Ni metallic foam.
9:20 AM Invited
Modification of Bi2Te3 Nanowires-based Composites for Enhanced Flexible Thermoelectric Films: Jaeyun Moon1; Matthew Pusko1; 1University of Nevada Las Vegas
Recent developments in wearable electronics and the Internet of Things (IoT) have stimulated research interests in light-weight, flexible, renewable, and sustainable energy-harvesting sources, consequently, flexible thermoelectric (TE) devices having simplicity and high practicability. In this talk, the modification of Bi2Te3 nanowires (NWs) - carbon nanotubes (CNTs) composite films for flexible TE devices will be discussed. The composites were optimized, providing better thermoelectric properties and improved flexibility and durability, by means of oxidizing the CNTs with concentrated acids. CNTs were treated with various acids to purify CNTs and improve the interface with inorganic nanowires, resulting in enhancing TE performance of the flexible composite films. The oxidation method also could assist in the debundling of the CNTs, beneficial for uniformly dispersed interface in the composites. In addition, tailoring dimension of Bi2Te3 nanowires by means of altering certain aspects of the synthesis conditions potentially improves TE performance of the composite films.
9:40 AM Invited
Vapor-phase Infiltration Synthesis of Functional Organic-inorganic Hybrid Nanocomposites: Chang-Yong Nam1; 1Brookhaven National Laboratory
Vapor-phase infiltration (VPI) is an organic-inorganic hybridization technique derived from atomic layer deposition (ALD), where vapor-phase inorganic precursors infiltrate into the matrix of organic templates, such as polymer thin films and patterns, to form target organic-inorganic hybrids. The synthesized hybrid can feature various unique materials properties and functionalities not observed in conventional materials. The subsequent, selective removal of organic matrix also leads to the generation of designed inorganic nanostructures that can be integrated into functional devices. In this talk, I will showcase our recent efforts that demonstrate the realization of unique hybrid material properties by VPI (e.g., the highest capacity to store/release elastic mechanical energy) and the integration of VPI-derived metal oxide nanostructures into optical sensors.
10:00 AM Break
10:15 AM
Insights into Salt-flux Reaction Synthesis Using Synchrotron-based 3D Nanotomography: Aaron Gladstein1; Jonathan Goettsch1; Caleb Reese1; Ashwin Shahani1; Alan Taub1; 1University of Michigan
Metal matrix composites (MMCs) are the future of materials in the transportation and aerospace industries due to their possibility of overall weight reduction by improving strength, wear resistance and high temperature tensile properties. Creating the reinforcement of MMCs via in-situ methods lead to enhanced matrix-particle bonding, particle size distribution, and reduction in contamination as compared with ex-situ processes, and therefore improved mechanical properties. This research focuses on MMCs made using salt-flux reaction synthesis, a process which creates carbides (e.g. TiC) via a redox reaction between the metal melt and a metal-bearing flux (e.g. K2TiF6), then the liberated metal reacts with carbon to precipitate carbides in the melt. Particle morphology of this method is highly dependent on processing conditions, such as matrix composition. Nanotomography was performed at the synchrotron at Brookhaven National Lab to visualize the 3D morphology of the formed carbides under varying Si loading in an Al matrix.