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    HIGH-ENTROPY ALLOY FOAM AND MANUFACTURING METHOD FOR THE FOAM
    4.
    发明申请
    HIGH-ENTROPY ALLOY FOAM AND MANUFACTURING METHOD FOR THE FOAM 审中-公开

    公开(公告)号：US20200165705A1

    公开(公告)日：2020-05-28

    申请号：US16743031

    申请日：2020-01-15

    Applicant: Seoul National University R&DB Foundation

    Inventor： Eun Soo PARK ,  Kooknoh YOON ,  Khurram YAQOOB ,  Je In LEE ,  Jin Yeon KIM

    IPC: C22C1/08 ,  C22C3/00 ,  C22C30/02 ,  B22D25/00

    Abstract: The present invention relates to a HEA foam prepared by selective dissolution of a second phase within a two-phase separating alloy comprising the HEA and a manufacturing method thereof. The manufacturing method of the HEA foam of the present invention has the effect of preparing a novel HEA foam, which was not available in the past, by leaving only a first phase after manufacturing a two-phase separating alloy comprising a first phase by HEA, wherein at least 3 metal elements act as a common solvent. Furthermore, the HEA foam of the present invention has a structure, wherein pores are distributed inside the HEA, in which at least 3 metal elements act as a common solvent. By adding a functional characteristic of low heat conductivity, etc., to the existing high strength characteristic of HEA, the HEA foam of the present invention can exhibit a complex effect by the combination of the two particular effects, thereby being capable of exhibiting excellent physical characteristics.

    Metallic glass composites with controllable work-hardening capacity
    5.
    发明申请
    Metallic glass composites with controllable work-hardening capacity 审中-公开

    公开(公告)号：US20170101702A1

    公开(公告)日：2017-04-13

    申请号：US15287693

    申请日：2016-10-06

    Applicant: Seoul National University R&DB Foundation

    Inventor： Eun Soo PARK ,  Wookha RYU ,  Hyun Seok OH ,  Jinwoo KIM ,  So Yeon KIM

    IPC: C22C45/10

    CPC classification number: C22C45/10 ,  C22C1/002 ,  C22C45/001

    Abstract: 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 (Vf) of the second phase due to constant correlation between the physical properties (absorbed energy Eta, a phase transformation temperature TMs, or a hardness H2nd) of a metastable B2 second phase precipated in the metallic glass matrix and the absorbed energy (Epa,V) by work-hardening per unit volume fraction of the second phase in the metallic glass matrix.

    BCC DUAL PHASE REFRACTORY SUPERALLOY WITH HIGH PHASE STABILITY AND MANUFACTURING METHOD THEREFORE
    7.
    发明申请
    BCC DUAL PHASE REFRACTORY SUPERALLOY WITH HIGH PHASE STABILITY AND MANUFACTURING METHOD THEREFORE 有权

    公开(公告)号：US20210301375A1

    公开(公告)日：2021-09-30

    申请号：US16996787

    申请日：2020-08-18

    Applicant: Seoul National University R&DB Foundation

    Inventor： Eun Soo PARK ,  Sang Jun Kim ,  Ji Young Kim ,  Hyun Seok Oh ,  Kook Noh Yoon

    IPC: C22C30/00 ,  C22C1/02 ,  C22C21/00

    Abstract: Disclosed are a BCC dual phase refractory superalloy with high phase stability and a manufacturing method therefor, the alloy comprising one or more of Ti, Zr, and Hf as Group 4 transition metals, one or more of Na and Ta as Group 5 transition metals, and Al, and having a structure of a BCC phase, wherein the BCC phase is composed of a disordered BCC phase and an ordered BCC phase, and wherein the ordered BCC phase is formed by allowing Al, which is a BCC phase forming element, to be soluted in an area of the BCC phase where the contents of the Group 5 transition metals are more than those of the Group 4 transition metals, so that the present disclosure provides a BCC dual phase refractory superalloy with high phase stability, characterized in that when a BCC dual phase with the ordered BCC phase and the disordered BCC phase separated from each other is formed by aging, the aging condition is precisely controlled through the apex temperature (Tc) of the BCC phase miscibility gap, expressed by (Equation 1) below. Tc(K)=881.4+331.7*x+546.7*y+893.0*x*z (provided that, 0≤x≤1, 0≤y≤0.2, 0≤x+y≤1, and 0≤z≤1)  (Equation 1)

    COMPLEX CONCENTRATED SOFT MAGNETIC AMORPHOUS ALLOYS WITH MULTI-COMPLEX QUENCHED-IN NUCLEI AND MANUFACTURING METHOD THEREOF
    9.
    发明公开
    COMPLEX CONCENTRATED SOFT MAGNETIC AMORPHOUS ALLOYS WITH MULTI-COMPLEX QUENCHED-IN NUCLEI AND MANUFACTURING METHOD THEREOF 审中-公开

    公开(公告)号：US20240240296A1

    公开(公告)日：2024-07-18

    申请号：US18413467

    申请日：2024-01-16

    Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION

    Inventor： Eun Soo PARK ,  Wookha RYU ,  Kyungjun KIM ,  Kook Noh YOON ,  Wan KIM

    IPC: C22C45/02 ,  C22C33/00 ,  H01F1/153

    CPC classification number: C22C45/02 ,  C22C33/003 ,  H01F1/15308

    Abstract: The present disclosure relates to a complex concentrated soft magnetic amorphous alloy with multi-complex quenched-in nuclei and a method for manufacturing the same, and more specifically, to a complex concentrated soft magnetic amorphous alloy which exhibits low coercivity while improving glass forming ability through the design of configurational entropy control complex alloying composition of a first main element group (Fe, Co, Ni), which determines the degree of magnetization as ferromagnetic metallic elements, a second alloying element group (B, Si, P, C), which facilitates amorphous formation, and a third cluster element group (Ca, Cu, Ag), which forms multi-complex quenched-in nuclei, and a method for manufacturing the same.
    The complex concentrated soft magnetic amorphous alloy developed in the present disclosure is characterized by having an excellent switching effect in which the alloy is easily magnetized and demagnetized when a magnetic field is applied and removed by implementing low coercivity. In addition, the present disclosure provides guidelines for alloy development to develop a new alloy with excellent functionality realized by applying a complex concentrated alloy design method to amorphous alloy design. In addition, the present disclosure has presented a step of performing a precise heat treatment based on the (time)-(temperature)-(transformation) curve measurement of the manufactured complex concentrated soft magnetic amorphous alloy, thereby presenting a method capable of effectively controlling an amorphous structure control that has been optimized through the existing trial and error method based on the prediction.

    BCC DUAL PHASE REFRACTORY SUPERALLOY WITH HIGH PHASE STABILITY AND MANUFACTURING METHOD THEREFORE
    10.
    发明申请
    BCC DUAL PHASE REFRACTORY SUPERALLOY WITH HIGH PHASE STABILITY AND MANUFACTURING METHOD THEREFORE 有权

    公开(公告)号：US20230058823A1

    公开(公告)日：2023-02-23

    申请号：US17965103

    申请日：2022-10-13

    Applicant: Seoul National University R&DB Foundation

    Inventor： Eun Soo PARK ,  Sang Gun KIM ,  Ji Young KIM ,  Hyun Seok OH ,  Kook Noh YOON

    IPC: C22C30/00 ,  C22C21/00 ,  C22C1/02

    Abstract: Disclosed are a BCC dual phase refractory superalloy with high phase stability and a manufacturing method therefor, the alloy comprising one or more of Ti, Zr, and Hf as Group 4 transition metals, one or more of Na and Ta as Group 5 transition metals, and Al, and having a structure of a BCC phase, wherein the BCC phase is composed of a disordered BCC phase and an ordered BCC phase, and wherein the ordered BCC phase is formed by allowing Al, which is a BCC phase forming element, to be soluted in an area of the BCC phase where the contents of the Group 5 transition metals are more than those of the Group 4 transition metals, so that the present disclosure provides a BCC dual phase refractory superalloy with high phase stability, characterized in that when a BCC dual phase with the ordered BCC phase and the disordered BCC phase separated from each other is formed by aging, the aging condition is precisely controlled through the apex temperature (Tc) of the BCC phase miscibility gap, expressed by (Equation 1) below. Tc(K)=881.4+331.7*x+546.7*y+893.0*x*z  (Equation 1) (provided that, 0≤x≤1, 0≤y≤0.2, 0≤x+y≤1, and 0≤z≤1)

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