Yonsei University

Dong Hyun Bae

Hun Sik Kang

Won Tae Kim

Do Hyang Kim

Eun Soo Park

Daniel J Sordelet

Min Ha Lee

HyunJoo Choi

Jin Kyu Lee

Seong Hoon Yi

Hyun Joo Choi

There are a composite material including an aluminum-based matrix and a device adopting the same. The composite material including an aluminum-based matrix may include an aluminum-based matrix including a plurality of grains, wherein each of the grains has a plurality of sub-grains; and a self-organized phase present at a sub-grain boundary between the plurality of sub-grains, wherein the self-organized phase has a band structure and includes a solid solution of aluminum and a non-metal element. The sub-grains and the self-organized phase coming into contact with the sub-grains may form a substantially coherent interface. A plurality of dislocations spaced apart from each other may be provided along the coherent interface.

Composite material including aluminum-based matrix and device adopting the same

According to one embodiment of the present invention, a cast alloy material is provided. The cast alloy material includes a matrix metal and an alloy element, wherein oxide particles in a nanometer scale are decomposed in the matrix metal, so that a new phase including a metal element that is a component of the oxide particles and the alloy element forms a band or network structure, wherein the metal element and the alloy element have a relationship of a negative heat of mixing, and wherein oxygen atoms formed by decomposition of the oxide particles are dispersed in the matrix metal and do not form an oxide with the matrix metal.

Alloy material in which are dispersed oxygen atoms and a metal element of oxide-particles, and production method for same

Disclosed is a method of manufacturing a metal matrix composite in which oxide nanoparticles are dispersed. Metal matrix composite powders in which oxide nanoparticles are dispersed are prepared. Gibbs free energy of the oxide nanoparticles is greater than that of an oxide of a metal matrix. A bulk processed material is manufactured from the composite powders through hot forming or a cast material is manufactured by inputting the composite powder into a molten base metal and then rapidly stirring a resultant mixture. The bulk processed material or the cast material is heat-treated so that atoms of the metal matrix and atoms of the oxide nanoparticles mutually diffuse. Oxygen atoms originating from the oxide nanoparticles are diffused and dispersed in the metal matrix.

Oxygen atom-dispersed metal matrix composite and method of manufacturing the same

A method of manufacturing a metal material is provided. The method includes steps of manufacturing a metal material in which oxygen atoms are dispersed, and forming a protective coating on a surface of the metal material by using an anode oxidation treatment, wherein the oxygen atoms in the metal material are supplied to the surface of the metal material during the anode oxidation treatment, so that the metal material and the protective coating are interface-bonded to each other substantially without pores therebetween or without an interface layer in which pores are formed, thereby improving corrosion resistance, as compared to a protective coating formed on a surface of a metal material in which oxygen atoms are not dispersed.

Metal material having protective coating and method for manufacturing the same

The present invention provides a preparation method of a metal matrix composite. The method comprises the following steps of: 1) pulverizing a solid carbon material to a micrometer size; 2) plastic deforming a metal matrix powder and dispersing the pulverized nanometer-sized carbon material into the metal matrix powder during the plastic deformation; 3) integrating the metal/carbon nano-material composite powder obtained in step 2) by using a hot forming process; and 4) heat treating the integrated bulk material at a predetermined temperature to form a composite having a metal-carbon nanophase, a metal-carbon nanoband formed by growth of the metal-carbon nanophase, or a metal-carbon nano-network structure formed by self-coupling of the metal-carbon nanoband.

Metal matrix composite, and preparation method thereof

A ductile particle-reinforced amorphous matrix composite characterized in that ductile powder is dispersed into amorphous matrix and the mixture is plastically worked to be consolidated and a method for manufacturing the same are provided. The amorphous powder includes any alloy, which can be produced in the form of amorphous structure and which is selected from the group consisting of Ni-, Ti-, Zr-, Al-, Fe-, La-, Cu- and Mg-based alloys. The method for manufacturing a ductile particle-reinforced amorphous matrix composite, the method comprising steps of preparing a mixture consisting of amorphous powder and ductile powder, obtaining a billet by compacting the mixture in a hermetically sealing condition, and plastic working the mixture by processing the billet at the temperature in the super-cooled liquid region of the amorphous alloy.

Ductile particle-reinforced amorphous matrix composite and method for manufacturing the same

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.

Growing community of inventors

Seoul, South Korea

Dong Hyun Bae