Seoul National University

Lg Electronics Inc.

Wookha Ryu

Eunsoo Park

Jinwoo Kim

Byeongchul Lee

Bumdong Sa

Eun Soo Park

Jein Lee

Eunsoo Yang

Hyun Seok Oh

Kooknoh Yoon

Geun Hee Yoo

So Yeon Kim

There are provided metallic glass matrix composites with controllable work-hardening capacity. In more detail, there are provided metallic glass matrix composite with controllable work-hardening capacity capable of having significantly excellent toughness due to a metastable second phase precipitated in-situ in a metallic glass matrix by polymorphic phase transformation during a solidification process without a separate synthetic process, and capable of controlling work-hardening capacity by measuring physical properties of a second phase and adjusting a volume fraction (V) of the second phase due to constant correlation between the physical properties (absorbed energy E, a phase transformation temperature T, or a hardness H) of a metastable B2 second phase precipated in the metallic glass matrix and the absorbed energy (E) by work-hardening per unit volume fraction of the second phase in the metallic glass matrix.

Metallic glass composites with controllable work-hardening capacity

A lubricating layer having wear resistance and reliability on the wear resistance, and a compressor including a lubricating layer are provided. The compressor may include a lubricating layer coated on a frictional portion between a rotational shaft and a bearing. The lubricating layer may include at least one metal phase selected from a group consisting of Titanium (Ti); and Copper (Cu), Cobalt (Co), Nickel (Ni), and Zirconium (Zr), and may be a composite structure of amorphous and nanocrystalline materials.

Compressor

Disclosed is an AMS process using a water-leachable alloy that reacts with water and dissolves, and a porous metal manufactured using the same. An AMS precursor including element groups that are selected in consideration of the relationship of heat of mixing with the water-leachable alloy composition to be subjected to the AMS process is immersed in the alloy melt, thus manufacturing a bi-continuous structure alloy. The bi-continuous structure alloy is subjected to dealloying using water, thus manufacturing the porous metal. The water-leachable alloy is a Ca-based alloy having high reactivity to water and high oxidation resistance at high temperatures, and a dealloying process thereof is performed using only pure water, unlike a conventional dealloying process performed using a toxic etching solution of a strong acid/strong base. The metal porous body has high elongation, a large surface area, and low thermal conductivity.

Water-leachable alloy-melt-swapping process and porous metal manufactured using the same

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Gyeongsan, South Korea

Wookha Ryu