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Chang-Soo Kim, Dirk Lehmhus, James Njuguna, Muralidharan Paramsothy, and Meisha Lei Shofner are the guest editors for the Composite Materials Committee, a joint committee of the TMS Functional Materials Division (FMD) and the TMS Structural Materials Division (SMD); and coordinators of the topic Futuristic Nanomaterials and Composites: Part II in this issue.
Iron Selenide (Fe25Se75) powders have been synthesized by mechanical alloying from pure elemental Fe and Se powders in a high-energy planetary ball mill. Morphological, compositional, structural and thermal changes during milling have been analyzed by scanning electron microscopy coupled to energy dispersive x-ray analysis, x-ray diffraction (XRD) and differential scanning calorimetry (DSC). With...
This article reviews in situ mechanical testing of crystalline nanowires in scanning and transmission electron microscopes, focusing on bottom–up synthesized, single-crystalline nanowires. Major experimental methods including resonance, bending, tension and buckling are summarized. In addition to commonly encountered experimental issues, deformation mechanisms learned from the in situ nanomechanical...
In this study, the effect of micro- and nano- particles on continuous and discontinuous dynamic recrystallization (DDRX) of nanostructured interstitial free (IF) steel was investigated. Microstructural observations were performed by scanning transmission electron microscopy. It was found that minimum and maximum final grain size obtained for nanocomposite and pure steel was 55 nm and 95 nm, respectively,...
Neutron and heavy ion irradiations generally induce voids in metallic materials, and continuous radiations typically result in void swelling and mechanical failure of the irradiated materials. Recent experiments showed that nanovoids in nanotwinned copper could act as sinks for radiation-induced Frank loops, significantly mitigating radiation damage. In this paper, we report on structural evolution...
Temperature-induced variation in magnetic properties for cobalt-based metallic glass was investigated. The formation of metastable nanocrystalline phases prior to complete devitrification and their effect on magnetic properties for Co72B19.2Si4.8Cr4 metallic glass was studied. The nature, shape, and distribution of the intermediate nanocrystalline phases were characterized using transmission electron...
The aim of this paper is to highlight the unique capabilities of electron backscattered diffraction-assisted trace analysis during in situ SEM mechanical testing of metals in order to get a better understanding of plasticity at the microscale. The technique allows for the direct observation of different deformation mechanisms, such as slip and twinning activity, at the microscale. Moreover, and contrary...
Synergistic effects of nanoclay (NC) and carbon nanotube (CNT) as a physical and chemical hybrid on the properties of epoxy matrix were studied. The chemical hybrid of CNT-NC (CNC) was synthesized by high-temperature decomposition of methane on NC supports. The formation of CNTs on the NC surface was confirmed by transmission electron microscopy, scanning electron microscopy (SEM) and Raman spectroscopy...
The potential of the evolving technology known as integrated computational materials engineering (ICME) is acknowledged by many stakeholders. Good progress has been made in computational tools for both the understanding of the material behavior and the understanding of the structural behavior. Several examples illustrate the potential of a tighter integration between both sciences. Industry is still...
The influence of the slag thickness on macrosegregation and transition zone (TZ) width of electroslag remelting (ESR) dual alloy ingot was investigated. To produce a dual alloy ingot, an electrode, constituted by a CrMoV bar and a NiCrMoV alloy bar, was remelted by using the ESR process. The slag thickness ranged from 50 mm to 70 mm. The results indicate that the slag temperature and melt rate first...
The incorporation of small volume fractions of nanoscale graphitic particles into varied base materials has been explored across fields ranging from automotive to aerospace to commercial plastics, with the goal of utilizing their enhanced thermal conductivity, electrical conductivity or mechanical strength. Percolation theory has emerged as a useful tool to aid in mapping and predicting the enhancement...
The effects of Pr doping on the structural, morphological, optical and non-linear optical properties have been investigated. X-ray diffraction and Raman analysis reveals the formation of highly c-axis-oriented films with hexagonal wurtzite structure of ZnO. Atomic force microscopy and scanning electron microscopy images reveal the formation of grains with well-defined grain boundaries. The Pr-doped...
The aim of this work was to determine the effect of melt-pouring temperature Tm and inoculant (cobalt aluminate—CoAl2O4) concentration in the prime coat of the shell mold on the macro- and microstructure of the IN713C superalloy. The results show that cobalt aluminate is an effective modifier of the IN713C superalloy, which causes refinement of the equiaxed grains (EX) and a reduction of...
Sheet-like precursors of NiO and Ag/NiO with different Ag contents were synthesized by a facile and easily controlled hydrothermal method. The NiO and Ag/NiO composite nanosheets were prepared by calcination of the corresponding precursors at 400°C for 3 h. The as-synthesized samples were characterized by thermogravimetric analysis, x-ray diffraction, transmission electron microscopy, and scanning...
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