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비정질 합금의 전단띠 내부 구조변화 해석을 통한 소성의 이해
이창면,박경원,이병주,심재혁,이재철,Lee, Chang-Myeon,Park, Kyoung-Won,Lee, Byeong-Joo,Shim, Jae-Hyeok,Lee, Jae-Chul 한국재료학회 2009 한국재료학회지 Vol.19 No.5
The effect of the initial packing structure on the plasticity of amorphous alloys was investigated by tracing the structural evolution of the amorphous solid inside a shear band. According to the molecular dynamics simulations, the structural evolution of the amorphous solids inside the shear band was more abrupt in the alloy with a higher initial packing density. Such a difference in the structural evolution within the shear band observed from the amorphous alloys with different initial packing density is believed to cause different degrees of shear localization, providing an answer to the fundamental question of why amorphous alloys show different plasticity. We clarify the structural origin of the plasticity of bulk amorphous alloys by exploring the microstructural aspects in view of the structural disordering, disorder-induced softening, and shear localization using molecular dynamics simulations based on the recently developed MEAM (modified embedded atom method) potential.
구석본(Seok-Bon Koo),전준미(Jun-Mi Jeon),이창면(Chang-Myeon Lee),허진영(Jin-Young Hur),이홍기(Hong-Kee Lee) 한국표면공학회 2018 한국표면공학회지 Vol.51 No.4
The self-annealing which leads evolution of microstructure in copper electroplating layers at room temperature occurs after forming deposition layer. During the process, crystal orientation, size and sheet resistance of plating layer change. Lastly, it causes the change of physical and mechanical characteristics such as a tensile strength of plating layer. In this study, the variation of incorporated impurities, microstructure and sheet resistance of copper plating layer formed by electroplating are measured with and without inorganic additives during the self-annealing. In case of absence of inorganic additives, the copper layer presents strong total intensity of incorporated impurities. During the self-annealing, such width of reduction was significant. Moreover, microstructure and crystal size are increased while the tensile strength is decreased noticeably. On the other hand, in the presence of inorganic additives, there is no observable distinction in the copper plating layer. According to the observation on movements of the incorporated impurities in electrodeposition copper layer, within 12 hours the impurities are continuously shifted from inside of the plating layer to its surface after as-deposited electroplating. Within 24 hours, except for the small portion of surface layer, it is considered that most of the microstructure is transformed.
비정질 합금의 중주기배열구조 및 이 구조가 소성에 미치는 역할: 분자동력학적 연구
이창면 ( Chang Myeon Lee ),이미림 ( Mi Rim Lee ),이광렬 ( Kwang Ryeol Lee ),강경한 ( Kyung Han Kang ),이병주 ( Byeong Joo Lee ),이재철 ( Jae Chul Lee ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.2
The local structural states of amorphous alloys have been depicted previously via short-range orders (SROs). However, the concept of SROs alone is inadequate and sometimes insufficient to explain the structure-property relation of the amorphous alloys. In this study, we propose new types of medium-range building structures that affect the mechanical properties, plasticity in particular. Using a combination of molecular dynamics simulations and the Voronoi tessellation method, we demonstrate a three-dimensional configuration of icosahedral medium-range orders (I-MROs) and elucidate how these icosahedral orders evolve by the application of shear deformation. It was observed that the structural stability of the icosahedral orders relies largely on how they are linked via percolation and this linking is explained in detail.
논문 : 비정질 합금의 자유부피 생성기구: 분자동력학적 고찰
이창면 ( Chang Myeon Lee ),박경원 ( Kyoung Won Park ),이병주 ( Byeong Joo Lee ),심재혁 ( Jae Hyeok Shim ),이재훈 ( Jae Hoon Lee ),이재철 ( Jae Chul Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2008 대한금속·재료학회지 Vol.46 No.11
This study examined the creation mechanism of free volume during homogeneous deformation induced by the elastostatic compression at room temperature. Experiments demonstrated that amorphous alloys subjected to the elastostatic compression underwent structural disordering, during which densely packed polyhedra breakdown to form new, loosely packed ones, resulting in the creation of excess free volume. A combination of experiments and molecular dynamics simulations are used to explore fundamental issues on how free volume is created during elastostatic compression.
무전해 동 도금을 위한 초음파 적용 주석-은-팔라듐 활성화 공정에 대한 연구
이창면(Chang-myeon Lee),허진영(Jin-young Hur),이홍기(Hong-kee Lee) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.6
An ultrasound-assisted Sn-Ag-Pd activation method for electroless copper plating was presented in this study. With this activation process, it was shown that the fine catalyst particles were homogeneously distributed with high density on the entire specimen. In addition, it was observed that incubation period occurred during the electroless plating step was decreased owing to the absorption of Ag which holds high catalytic activity. Resulting from the refinement and high densification of catalyst, the defect-free gap-fill was achieved within the 20x nm trench
무전해 구리 도금액에서 착화제가 접합력에 미치는 영향에 대한 고찰
이창면(Chang-myeon Lee),전준미(Jun-Mi Jeon),허진영(Jin-young Hur),이홍기(Hong-kee Lee) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.4
The primary purpose of this research is to investigate how much the complexing agent in electroless Cu electrolytes will affect adhesion strength between copper film and Ta diffusion barrier for Cu interconnect of semiconductor. The adhesion strength using rochelle’s salt as complexing agent was higher than the case of using EDTA-4Na. Effect of complexing agent on adhesion strength and electrical resistivity was studied in crystal structural point of view.
비정질 합금의 소성에 미치는 조성분리 원소의 역할 : 실험 및 전산모사 연구
박경원,이창면,사인영,이병주,이재철,Park, Kyoung-Won,Lee, Chang-Myeon,Sa, In-Young,Lee, Byeong-Joo,Lee, Jae-Chul 한국재료학회 2009 한국재료학회지 Vol.19 No.2
A series of experiments demonstrated that an addition of Ag into $(Cu_{0.5}Zr_{0.5})_{100-x}Ag_{x}$ amorphous alloys alters the plasticity of the alloys in a systematic manner. Energy dispersive x-ray spectroscopy (EDS) conducted on the $(Cu_{0.5}Zr_{0.5})_{100-x}Ag_{x}$ alloys exhibited the presence of compositional modulation, indicating that compositional separation had occurred. The presence of compositional modulation was also validated using a combined technique of molecular dynamics and Monte Carlo simulation. In this study, the effect of Ag on the compositional separation in $(Cu_{0.5}Zr_{0.5})_{100-x}Ag_{x}$ bulk amorphous alloys was investigated to understand the role played by the phase-separating element on the plasticity of the amorphous alloys.