Mechanically alloyed nanocomposites

With the presentation of a theory of liquid alloys, we have now assembled all the necessary tools for the ab initio construction of an alloy phase diagram.

Alloy Phase Diagrams

Recent progress and future challenges on the use of high performance magnetic nano-adsorbents in environmental applications

Mixed-valent iron [Fe(II)-Fe(III)] minerals such as magnetite and green rust have received a significant amount of attention over recent decades, especially in the environmental sciences. These mineral phases are intrinsic and essential parts of biogeochemical cycling of metals and organic carbon and play an important role regarding the mobility, toxicity, and redox transformation of organic and inorganic pollutants. The formation pathways, mineral properties, and applications of magnetite and green rust are currently active areas of research in geochemistry, environmental mineralogy, geomicrobiology, material sciences, environmental engineering, and environmental remediation. These aspects ultimately dictate the reactivity of magnetite and green rust in the environment, which has important consequences for the application of these mineral phases, for example in remediation strategies. In this review we discuss the properties, occurrence, formation by biotic as well as abiotic pathways, characterization t...

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Magnetite and Green Rust: Synthesis, Properties, and Environmental Applications of Mixed-Valent Iron Minerals

Nanostructured metallic transition metal carbides, nitrides, phosphides, and borides for energy storage and conversion

A new method for the identification and quantification of magnetite-maghemite mixture using conventional X-ray diffraction technique.

Magnetic iron oxide nanoparticles prepared by electrical wire explosion for arsenic removal

Hydrogen absorption–desorption characteristics of Ti(0.22 + X)Cr(0.28 + 1.5X)V(0.5 − 2.5X) (0 ≤ X ≤ 0.12) alloys

Microstructure and mechanical properties of (Ti,W)C–Ni cermet prepared using a nano-sized TiC–WC powder mixture

In this experiment, we carried out a two-step deoxidation process to obtain Ti ingots with low oxygen concentration from commercial Ti powder. The first step was to primarily reduce oxygen in Ti powder using Ca and the second was to melt the deoxidized Ti powder in Ar atmosphere with added hydrogen using a vacuum arc melting system. We used two types of raw Ti powder, one with a high oxygen concentration of 5,600ppm and average powder size of 35µm, and the other with 2,200ppm and 115µm. The high oxygen of 5,600ppm in the Ti powder was reduced to approximately 1,460ppm by the two-step process of melting after deoxidizing the Ti powder with Ca at 973K. On the other hand, in the case of the Ti powder with low oxygen of 2,200ppm, the Ti ingot with low oxygen of 600ppm could be prepared by the twostep process of melting after deoxidizing at 1,103K. The Vickers hardness and c/a value of Ti ingots decreased as the oxygen concentration decreased. [doi:10.2320/matertrans.M2012004]

Chang-Yul Suh

Papers

A new method for the identification and quantification of magnetite-maghemite mixture using conventional X-ray diffraction technique.

Magnetic iron oxide nanoparticles prepared by electrical wire explosion for arsenic removal

Hydrogen absorption–desorption characteristics of Ti(0.22 + X)Cr(0.28 + 1.5X)V(0.5 − 2.5X) (0 ≤ X ≤ 0.12) alloys

Microstructure and mechanical properties of (Ti,W)C–Ni cermet prepared using a nano-sized TiC–WC powder mixture

Deoxidation of Ti Powder and Preparation of Ti Ingot with Low Oxygen Concentration