Metal-Matrix Composites: Advances in Analysis, Measurement and Observations: NanoComposites [Nanoscale + Nanoreinforcements]
Sponsored by: TMS Structural Materials Division, TMS: Composite Materials Committee
Program Organizers: Srivatsan Tirumalai; William Harrigan, Gamma Alloys; Simona Hunyadi Murph, Savannah River National Laboratory
Monday 2:00 PM
March 15, 2021
Room: RM 32
Location: TMS2021 Virtual
Session Chair: Tirumalai Srivatsan, University of Akron
2:00 PM Keynote
A Study Aimed at Understanding the Use of Nanomaterial-treated Filters for the Uptake of Heavy Metals from Water Sources: Simona Hunyadi Murph1; 1Savannah River National Laboratory
Hybrid nanoscale architectures often exhibit improved physical and chemical properties over their single-component counterparts, and hence are potentially useful in a broader range of applications. This presentation will summarize recent advances in the design, fabrication and characterization of hybrid metal-metal oxide nano-architectures for energy storage, environmental stewardship and catalytic applications.
2:40 PM Invited
Strengthening Effects of Multi-walled Carbon Nanotubes and Graphene Nanoplatelets Reinforced in Nickel Matrix Nanocomposites: Amit Patil1; Tushar Borkar1; 1Cleveland State University
Multi-walled carbon nanotubes (MWCNT) reinforced nickel matrix nanocomposites (Ni-CNT), and Graphene nanoplatelet (GNP) reinforced nickel matrix nanocomposites (Ni-GNP) are fabricated using two different types of ball milling techniques. Dry milling and wet milling processing routes are utilized to achieve the dispersion of MWCNT/GNP in the nickel matrix, and the nanocomposites are consolidated using Spark plasma sintering (SPS) technique. Ni-CNT/GNP powder with varying weight percentage is milled for up to 12 hours to investigate the effect on the microstructure, grain size, and dispersion of MWCNT/GNP in the nickel matrix. Ni-CNT/GNP nanocomposites exhibited enhanced improvement in the mechanical properties in comparison with pure nickel. Mechanical properties of the composites are evaluated to understand the effects of MWCNT/GNP dispersion on the strength of the composites. The applicability of the micromechanical models in predicting the strengthening effect of the reinforcement in the matrix is analyzed.
3:10 PM
Influence of Tungsten Nanopowders on Enhancing the Aging Behavior of a Copper-chromium Alloy: Gongcheng Yao1; Shuaihang Pan1; Xiaochun Li1; 1University of California Los Angeles
Cu-Cr alloys are a class of high-strength high-conductivity Cu alloys. However, limited by the Cu-Cr phase diagram, the strength of Cu-Cr alloys by precipitation-hardening has reached a certain limit. Suitable nanoparticles incorporating into Cu-Cr alloys, i.e. nano-treating, are expected to modify the aging behavior and further improve their properties. In this study, Cu-Cr alloy containing tungsten (W) nanoparticles was cast. The aging behavior of the nano-treated Cu-Cr and Cu-Cr counterparts is assessed. W nanoparticles accelerate the precipitation, leading to a significant reduction in the peak-aging time. Besides, the microhardness of the nano-treated Cu-Cr is increased over Cu-Cr after 45-min aging. Cold rolling can further enhance the microhardness of the nano-treated Cu-Cr. Moreover, the nano-treated sample exhibits improved thermal stability. Thus, nano-treating the Cu-Cr alloy by W nanoparticles is promising to break the limits of current Cu-Cr alloys.
3:30 PM Invited
In situ Atomic Study of Spontaneous Nanocrystallization of Intermetallic for Interconnection of High-power and Flexible Electronics: Ying Zhong1; Chunqing Wang2; Sungho Jin3; 1University of South Florida; 2Harbin Institute of Technology; 3University of California at San Diego
A new phase-transformation-induced path to spontaneous formation of extreme nanograin structure is reported. In-situ-heating-mode-microscopy exhibited a substantial grain-growth of Cu6Sn5. During cooling, the grain-growth continued, but it spontaneously switched to grain-refinement mode on phase transformation through ~180 °C from η-Cu6Sn5 to η’-Cu6Sn5, ending up with an extremely small nanograin size of ~2.5 nm. The cooling cycling always restores the nanograin size regardless of thermal exposure history, making this to be the first demonstration to stabilize the nanograin with its own spontaneous behavior. The Young’s Modulus was significantly reduced by ~×3, and the elongation was remarkably increased by ~×8 to ~9%. Nano-Cu6Sn5 interconnection can be obtained at lower temperature than the working temperature, preventing the damage of the flexible substrates and supporting high-power electronics. This work will also inspire other researchers to create many additional sub-4 nm type nanocrystalline intermetallicsand more interesting functions which were difficult to gain before.
4:00 PM Invited
Correlation of Fine Scale Microstructure and Mechanical Properties of Copper-alumina Nanocomposites: Ramasis Goswami1; 1Naval Research Laboratory
Al2O3 and B4C have considerably high compressive strength and considerable efforts have been made to manufacture metal matrix composites (MMCs) to enhance the mechanical properties by adding various volume fractions of B4C or Al2O3 powder to achieve higher homogeneity of ceramic particles in the matrix. Here we present the recent development of MMCs with B4C processed in the solid state. In all cases, the composites show higher hardness as compared to the base metals and alloys. We present the microstructure and interfacial characteristics of the composites using x-ray diffraction (XRD) and transmission electron microscopy (TEM), and demonstrate that the formation of interfacial phase during sintering improves interface cohesion and mechanical properties significantly.
4:30 PM
Influence of Sintering on the Development of Alumina Toughened Nanocomposites: Conventional Versus Microwave: Kunjee Meena1; Srivatsan Tirumalai2; 1Indian Institute of Technology Roorkee; 2University of Akron
In this study, the physical, mechanical properties and microstructural behaviors of 3 mol % Yttria-Stabilized-Zirconia (3YSZ) matrix reinforced with 10 vol.% of alumina were investigated. The composites were developed separately through Conventional Sintering (1600 °C, 5 °C/min and held for 6 hours) and Microwave Sintering (1600 °C, 25°C/min and held for 1 hours) under pressure-less condition. The powders were compacted using a uni-axial cold isostatic pressure of 200 MPa. The relative density, average grain size, microhardness and fracture toughness of conventional sintered samples and microwave sintered samples were found to be (98.16±0.15, 600 nm, 16.81±0.7GPa and 4.9 MPa m1/2) and (99.29±0.10, 421 nm, 19.65±0.5GPa and 5.2 MPa m1/2), while the thermal conductivity was found to be 2.3 W/mK and 2.6 W/mK, respectively. A uniform microstructure was observed in both the sample. The microwave sintered samples were observed superior results compared to conventional sintered samples, which may be more useful in the field of the thermal barrier coatings and dental applications.