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Yonsei University

Seong Hoon Yi

Won Tae Kim

Eun Soo Park

Dong Hyun Bae

Do Hyang Kim

Disclosed is a quasicrystalline phase-reinforced Mg-based metallic alloy with high warm and hot formability, and making method thereof. The metallic alloy comprises a composition of Mg&mdash;1&tilde;10 at % Zn&mdash;0.1&tilde;3 at % Y, in which a two-phase region consisting of a quascrystalline phase and a magnesium-based solid solution phase exists. Constituting a matrix structure, the Mg-based solid solution phase (&agr;&mdash;Mg) is formed as a primary solid phase upon solidification. The quasicrystalline phase serves as a second phase and forms, together with the Mg-based solid solution phase, a eutectic phase, thereby reinforcing the matrix. The materials obtained through the hot rolling or extrusion of the cast alloy have an increased volume % of the second phase and thus show significantly increased strength.

Quasicrystalline phase-reinforced Mg-based metallic alloy with high warm and hot formability and method of making the same

An apparatus for ventilating spacious public rooms, workshops, industrial halls, underground parking lot and the like spaces, which apparatus comprises a damper having a plurality of shutters attached by a ring to inner surface of tubular body so as to radially move a series of shutters from shut position to opened position. The apparatus further comprises a nozzle having a plurality of guide vanes which occur swirls in jet as well as in injected ventilation air supplied to the rooms. With this arrangement, the apparatus is effective for obtaining a precise adjustment of supply air with minimum air resistance, non-turbulent, and protecting dwelling zones against undesirable thermal air streams or undesirable radiation.

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Seoul, South Korea

Seong Hoon Yi