公开(公告)号：US20220098714A1

公开(公告)日：2022-03-31

申请号：US17486998

申请日：2021-09-28

Applicant: Seoul National University R&DB Foundation

Inventor： Eun Soo PARK ,  Geun Hee YOO ,  Kook Noh YOON ,  Ji Young KIM ,  Wook Ha RYU

IPC: C22C45/10 ,  B22D19/00 ,  F16H49/00 ,  B22D21/02

Abstract: Disclosed is a gear including a resettable metallic glass. The gear of the present disclosure includes, as a base material, a resettable metallic glass, wherein the resettable metallic glass includes at least one metal element selected from each of (a) the group consisting of Ti, Zr, and Hf and (b) the group consisting of Fe, Co, Ni, Cu, and Zn, and further includes at least one metal element to maximize the complexity in the thermodynamic enthalpy of mixing among constituent elements, thereby including multiple resetting cores in various atomic-scale cluster forms in an amorphous matrix, leading to a structure with maximized structural complexity.

公开(公告)号：US20210395864A1

公开(公告)日：2021-12-23

申请号：US17070051

申请日：2020-10-14

Applicant: Seoul National University R&DB Foundation

Inventor： Eun Soo PARK ,  Kook Noh YOON ,  Jung Soo LEE ,  Geun Hee YOO ,  Ji Young KIM

IPC: C22C19/07 ,  C22C1/10

Abstract: The present disclosure provides a cobalt-based alloy having self-healing property. The cobalt-based alloy has composition as below: [[CoaTibCr100-a-b]1-0.01cSc]1-0.01dHd (57≤a≤92.5 at. %, 6≤b≤33 at. %, a+b

公开(公告)号：US20210147954A1

公开(公告)日：2021-05-20

申请号：US16996773

申请日：2020-08-18

Applicant: Seoul National University R&DB Foundation

Inventor： Eun Soo PARK ,  Kook Noh YOON ,  Min Seok KIM ,  Sang Jun KIM ,  Jeong Won YEH

IPC: C21D9/00 ,  C22C38/30 ,  C22C38/38

Abstract: The present disclosure provides The present disclosure provides a resettable alloy having a resetting mechanism introduced thereinto through simplr resetting treatment, thereby prolonging the lifespan of materials, and a manufacturing method for the same. The resettable alloy comprises a body-centered tetragonal(BCT)-face-centered cubic(FCC) dual structure comprising: BCT martensite phase matrix; and FCC austenite phase present within the matrix, wherein the FCC phase is formed by selective segregation of component elements and can be repetitively reset through metastable reversible phase transformation.

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.

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)