신소재공학과

Seminar

Extra Form
Date 20190528

■ Title: Severe Lattice Distortion in Medium-entropy FCC Single-phase Alloys

 

 Speaker:  Prof. Seok Su Sohn (Dept. of MSE, Korea Univ.)

 

■ Date and time:  5/28(Tue) 16:00

 

■ Venue:  Applied Engineering Building (W1) 1st Floor, Multimedia Lecture Room

 

 Host :  Prof. Kibum Kang

  

 Abstract :   

 

Severe lattice distortion is a core effect in the design of multi-principal element alloys with the aim to enhance yield strength, a key indicator in structural engineering. Yet, the yield strength values of medium- and high-entropy alloys investigated so far do not substantially exceed those of conventional alloys owing to the insufficient utilization of lattice distortion. Here, based on a combined theoretical and experimental approach, I’ll introduce that the degree of lattice distortion is indeed a key parameter in controlling strengthening mechanisms for the design of hitherto unexplored ultrastrong medium-entropy single-phase alloys. Vanadium (V) is exploited as a very efficient element in a disordered VCoNi solid solution alloy. It is demonstrated that a wide fluctuation of the atomic bond distances in such alloys, i.e., severe lattice distortion, improves both yield stress and its sensitivity to grain size. Due to this enhanced Hall-Petch dependency, the VCoNi alloy could present 1.3 GPa of yield strength at 1mm of average grain size. In addition, the dislocation-mediated plasticity effectively enhances the strength–ductility relationship by generating nanosized dislocation substructures due to massive pinning.


List of Articles
No. Category Subject Author Date Views
Notice Regular 6/4 (Tue) Prof. SangBum Kim (Dept. of MSE, SNU) ADMINI 2019.05.31 477
» Regular 5/28 (Tue) Prof. Seok Su Sohn (Dept. of MSE, Korea Univ.) ADMINI 2019.05.24 446
Notice Regular 5/21 (Tue) Emeritus Prof. Joong Keun Park (Dept. of MSE, KAIST) ADMINI 2019.05.17 454
Notice Regular 5/17 (Tue) Prof. Su-Hyun Gong (Dept. of Physics, Korea Univ.) ADMINI 2019.05.10 950
Notice Special 5/7 (Tue) Prof. Dr. -ing. Dierk Raabe (MPIE) ADMINI 2019.04.30 763
Notice Regular 4/30 (Tue) Prof. Min Hyuk Park (School of MSE, Pusan National Univ.) ADMINI 2019.04.25 547
Notice Regular 4/23 (Tue) Prof. Seungwu Han (Dept. of MSE, SNU) ADMINI 2019.04.19 308
298 Special [KI 목요세미나] 1/6 (목) 11:00 민범기 교수 (KAIST 기계공학전공) Administrator 2011.11.04 8143
297 Regular 2/8 (화) 16:00 유필진 교수 (성균관대학교 화학공학부) Administrator 2011.11.04 10180
296 Regular 2/15 (화) 김광수 박사 (삼성전기 중앙연구소) Administrator 2011.11.04 9860
295 Special [KCC Open Seminar] 2/23 (수) 12:00 최민기 교수 (KAIST 생명화학공학과) Administrator 2011.11.04 9354
294 Regular 2/22 (화) 16:00 김성준 교수 (서울대학교 전기공학부) Administrator 2011.11.04 10184
293 Special 2/25 (금) Dr. Georg J. Schmitz (ACCESS e.V. at the RWTH Aachen University) Administrator 2011.11.04 7582
292 Regular 3/15 (화) 황인석 상무 (LG화학 기술연구원) Administrator 2011.11.04 10148
291 Special [KCC Open Seminar] 3/23 (수) 12:00 김필한 교수 (KAIST 나노과학기술대학원) Administrator 2011.11.04 9442
290 Regular 3/22 (화) 최성율 박사 (한국전자통신연구원 그래핀연구센터) Administrator 2011.11.04 9868
289 Regular 4/5 (화) 박준석 박사 (삼성전자종합기술원 Display Device Lab.) Administrator 2011.11.04 9852
288 Regular 4/26 (화) 김광수 박사 (삼성전기 중앙연구소) Administrator 2011.11.04 9638
287 Special 4/8 (금) Prof. Zhang Xing (Tsinghua Univ.) Administrator 2011.11.04 7422
286 Regular 4/19 (화) 남기태 교수 (서울대학교 재료공학부) Administrator 2011.11.04 10488
285 Special 4/27 (수) Prof. I-Wei Chen (Dept. of Materials Science and Engineering, University of Pennsylvania) Administrator 2011.11.04 7298
284 Special [KINC 세미나] 5/11 (수) 16:00 이관형 박사 (Department of Mechanical Engineering, Columbia University) Administrator 2011.11.04 9699
283 Regular 5/3 (화) 정현석 교수 (국민대학교 신소재공학부) Administrator 2011.11.04 10034
282 Special [WCU 세미나] 5/12 (목) 16:00 윤웅찬 교수 (부산대학교 화학과) Administrator 2011.11.04 9052
281 Regular 5/17 (화) 박종남 교수 (울산과학기술대학교 친환경에너지공학부) Administrator 2011.11.04 10058
280 Special [WCU-FS 사업단 세미나] 6/7 (화) 조정대 박사 (한국기계연구원) Administrator 2011.11.04 13731
279 Special 6/9 (금) 이기석 박사 (서울대학교 재료공학과) Administrator 2011.11.04 9195
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