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Through-Thickness Microstructures and Yield Strength Enhancement for AZ31 Mg Sheets Treated by Ultrasonic Nanocrystal Surface Modification
초음파 미세 표면 냉간단조법(UNSM)을 적용한 AZ31 마그네슘 판재의 단면 미세조직 및 강도 향상 효과 분석
Myungsung Kang, Joo-Hee Kang, Hyeonuk Park, Jun-Hyung Kim, Young-Sik Pyoun, Minjae Baek, Dong Jun Lee, Seung Jin Lee, Sanghu Park, Hong Moule Kim, Sung Hyuk Park, Yoon Suk Choi
강명성, 강주희, 박현욱, 김준형, 편영식, 백민재, 이동준, 이승진, 박상후, 김홍물, 박성혁, 최윤석
Korean J. Met. Mater. 2022;60(3):169-179.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.169

Abstract
An ultrasonic nanocrystal surface modification (UNSM) technique was applied to a 1-mm thick AZ31 magnesium sheet. UNSM is a relatively new surface modification technique in which a hard, hemispherical tip (2.38 mm in diameter) strikes the surface at an ultrasonic frequency to induce plastically deformed gradient microstructures and deep compressive..... More

                        
Formation of Surface-Wrinkled Metal Nanosheets via Thermally Assisted Nanotransfer Printing
열보조 나노 전사 프린팅을 통한 금속 박막의 표면 주름 나노패턴 형성 방법
Tae Wan Park, Woon Ik Park
박태완, 박운익
Korean J. Met. Mater. 2021;59(12):880-885.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.880

Abstract
Nanopatterning methods for pattern formation of high-resolution nanostructures are essential for the fabrication of various electronic devices, including wearable displays, high-performance semiconductor devices, and smart biosensor systems. Among advanced nanopatterning methods, nanotransfer printing (nTP) has attracted considerable attention due to its process simplicity, low cost, and great pattern resolution. However,..... More

                        
A Study on the Effects of Surface Energy and Topography on the Adhesive Bonding of Aluminum Alloy
Gilho Kang, Wonjong Choi
Korean J. Met. Mater. 2021;59(8):567-574.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.567

Abstract
The bonding properties of adhesives are mainly affected by surface roughness, topography and chemical adsorption. In this paper, we studied the effects of surface pretreatment of Al 2024-T3 (bare) in terms of surface roughness, topography and surface free energy. Surface pre-treatment included solvent cleaning, FPL etching, PAA and CAA treatment...... More

                        
Effects of JGB Additives on the Microstructures and Electrical Properties of Electroplated Copper Foil
JGB 첨가제에 의한 동박의 미세구조변화와 전기적 특성
Tae-Gyu Woo, Il-Song Park
우태규, 박일송
Korean J. Met. Mater. 2021;59(6):404-411.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.404

Abstract
Extremely thin film high quality copper foil is required to ensure high performance in electronics and slimness in secondary batteries. During the electroplating of copper foil, Janus Green B(JGB) and Collagen were introduced as additives to the electrolytes to study their effects. The structural and electrical properties of the electroplated..... More

                           Cited By 1
Initial Behavior of Additives and Mechanical Properties of Copper Foils on High Current Density
고전류밀도에서의 첨가제 초기 거동 및 동박의 기계적 특성
Tae-Gyu Woo, Jong-Jae Park, Il-Song Park
우태규, 박종재, 박일송
Korean J. Met. Mater. 2021;59(5):304-313.   Published online 2021 Apr 6
DOI: https://doi.org/10.3365/KJMM.2021.59.5.304

Abstract
In this study, we studied the surface and mechanical properties of multiple additives as well as the initial plating properties of individual additives. With the individual additive groups, copper crystals tended to converge at a stage above the critical amount of additive. When chloride ions were added, large crystals formed..... More

                           Cited By 1
Nucleation and Growth-Controlled Morphology Evolution of Cu Nanostructures During High-Pressure Thermal Evaporation
Eunji Lee, Woomi Gwon, Sangwoo Ryu
Korean J. Met. Mater. ;59(2):135-141.   Published online 2021 Jan 27
DOI: https://doi.org/10.3365/KJMM.2021.59.2.135

Abstract
The formation of porous material structures has been widely investigated for the development of high-performance energy materials, catalysts, and chemical sensing devices. Various nanoporous structure fabrication methods are based on wet-chemical processes, which require precise control of the process parameters. Physical vapor deposition such as thermal evaporation utilizes high vacuum..... More

                           Cited By 1
Effect of Electrode Patterning on Melting Behavior and Electrode Degradation in Resistance Spot Welding of A6014-T4 Alloy
A6014-T4 합금 소재의 저항 점 용접 시 용융 거동 및 전극 열화에 미치는 전극 패터닝 효과
Hyun-Uk Jun, Jae-Hun Kim, Jae Won Kim, Eun-Kyung Lee, Yang-Do Kim, Changwook Ji
전현욱, 김재훈, 김재원, 이은경, 김양도, 지창욱
Korean J. Met. Mater. 2020;58(12):863-874.   Published online 2020 Dec 4
DOI: https://doi.org/10.3365/KJMM.2020.58.12.863

Abstract
In this study, the effects of electrode surface design on the resistance spot weldability and degradation of the electrode following resistance spot welding (RSW) of aluminum 6014-T4 alloy were investigated. A new patterning method that can be produced through repetitive pressurization was applied to the electrode, producing a lattice-like pattern..... More

                           Cited By 4
Facile Synthesis of ZnO Thin Films at Low Temperatures Using an Additive-Free Electrochemical Oxidation Method
Euije Jo, Dongwan Kim, Jae-Young Leem
Korean J. Met. Mater. 2020;58(9):645-652.   Published online 2020 Aug 13
DOI: https://doi.org/10.3365/KJMM.2020.58.9.645

Abstract
Because of their simplicity and low equipment costs, various oxidation methods can be used to create metal oxides, but they still require long processing times and/or high temperatures. In this study, a new electrochemical oxidation (ECO) method, which oxidizes metal in DI water with a constant flowing current to both..... More

                        
Carburizing Behavior of AISI 4115 Steel According to the Flow Rates of Acetylene in Vacuum Carburizing
AISI 4115 강의 진공 침탄 시 아세틸렌 유량에 따른 침탄 거동
Gi-hoon Kwon, Kyoungil Moon, Young-Kook Lee, Minsu Jung
권기훈, 문경일, 이영국, 정민수
Korean J. Met. Mater. 2020;58(9):617-625.   Published online 2020 Aug 13
DOI: https://doi.org/10.3365/KJMM.2020.58.9.617

Abstract
The vacuum carburizing behavior of AISI 4115 steel according to acetylene flow rates (1, 5, 10, 20, 30, 40, and 50 sccm) and temperatures (900, 950, and 1000 oC) was quantitatively investigated through microstructure, carbon concentration and hardness analyses. As the acetylene flow rate increased, the penetration rate of carbon..... More

                        
Improvement of Wear Resistance in Laser Shock-Peened Copper Contacts
Donghyuck Jung, Changkyoo Park, Eun-Joon Chun, Yoon-Jun Kim
Korean J. Met. Mater. 2020;58(8):560-565.   Published online 2020 Jul 27
DOI: https://doi.org/10.3365/KJMM.2020.58.8.560

Abstract
This study investigated the influence of laser shock peening without coating (LSPw/oC) on the degradation of copper electrical contacts. A theoretical calculation of the plastic-affected depth (PAD) induced by LSPw/oC was performed, based on the laser-induced plasma pressure along with the Hugoniot elastic limit of our LSPw/oC experimental conditions. The..... More

                           Cited By 3
Design of Ultrawide Bandwidth Electromagnetic Wave Absorbers with Square Patch Frequency Selective Surfaces with Different Geometries
Tian Liu, Sung-Soo Kim
Korean J. Met. Mater. 2020;58(5):326-333.   Published online 2020 Apr 20
DOI: https://doi.org/10.3365/KJMM.2020.58.5.326

Abstract
A reliable and efficient numerical method is presented for the design of broadband absorbers, fabricated by layering two square patch-frequency selective surfaces (SP-FSS) with different geometries on a grounded dielectric substrate. The circuit parameters of the inductance and capacitance of the SP-FSS were retrieved using the strip wire conductor model...... More

                           Cited By 2
Measurement of Intrinsic Hardness of Deposited Chromium Thin Films by Nanoindentation Method and Influencing Factors
나노인덴테이션 방법으로 크롬 박막의 고유경도를 측정하는 방법과 영향 인자
Young-Joon Kang, Ju-Hwan Baeg, Hyun Park, Young-Rae Cho
강영준, 백주환, 박현, 조영래
Korean J. Met. Mater. 2020;58(3):207-215.   Published online 2020 Mar 5
DOI: https://doi.org/10.3365/KJMM.2020.58.3.207

Abstract
Materials with very small dimensions exhibit different physical and mechanical properties compared to their bulk counterparts. This becomes significantly important for the thin films that are widely used as components in micro-electronics and functional materials. In this study, a chromium (Cr) thin film was deposited on a silicon (Si) wafer..... More

                           Cited By 2
Influence of Alloy Content on Microstructure and Corrosion Resistance of Zn-based Alloy Coated Steel Product
Zn계 합금도금재의 미세구조 및 내식성에 미치는 합금 조성 변화 영향
Jae-Won Lee, Sung-Jin Kim, Min-Suk Oh
이재원, 김성진, 오민석
Korean J. Met. Mater. 2020;58(3):169-174.   Published online 2020 Mar 5
DOI: https://doi.org/10.3365/KJMM.2020.58.3.169

Abstract
The effects of alloy composition on the coating structure and corrosion resistance of hot-dip Znbased alloy coated steel products were investigated. Zn-based alloy coating layers with different Al and Mg compositions were fabricated using a batch-type galvanizing simulator. Various intermetallic compounds including Zn, Zn/MgZn2 binary eutectic, Zn/Al binary eutectoid and..... More

                           Cited By 2
Study on the Selective Surface Modification of Injection Mold Steels by Laser Materials Processing: Relationship Between AlN Formation and Surface Hardening During Laser Nitriding
레이저 가공 기반 사출 금형강의 선택적 표면 개질 연구: 레이저 나이트라이딩에 따른 AlN 형성 및 경화 거동
Eun-Joon Chun, Changkyoo Park, Wonah Park
천은준, 박창규, 박원아
Korean J. Met. Mater. 2020;58(1):32-40.   Published online 2019 Dec 12
DOI: https://doi.org/10.3365/KJMM.2020.58.1.32

Abstract
Laser surface heat treatment and laser nitriding processes were applied using selective surface modification techniques to investigate phase transformation, microstructural evolution, and surface hardening behaviors for two types of plastic injection mold steels, AISI 1045 and P21. During laser surface heat treatment, a 245% hardness increase compared to that of..... More

                           Cited By 4
Effect of Surface Roughness on the Formation of Nano-to-Mirco Patterns Using Pattern Transfer Printing
나노-마이크로 패턴의 형성에 미치는 기판의 표면 거칠기 영향
Tae Wan Park, Myunghwan Byun, Hyunsung Jung, Woon Ik Park
박태완, 변명환, 정현성, 박운익
Korean J. Met. Mater. 2020;58(1):26-31.   Published online 2019 Dec 12
DOI: https://doi.org/10.3365/KJMM.2020.58.1.26

Abstract
The ability to form high quality nano-/micro- patterns is very important for the nanofabrication of high-density electronic devices. However, remaining challenges have yet to be resolved, including low quality roughness, low pattern resolution, and the highly complex process. In this study, we suggest a novel and simple method for creating..... More

                        
Microwave Absorbing Properties of Carbonyl Iron Particle Composites with Frequency Selective Surface
주파수 선택 표면이 부착된 카보닐 철 분말 복합재의 전파흡수특성
Han-Shin Cho, Sung-Soo Kim
조한신, 김성수
Korean J. Met. Mater. 2019;57(11):741-746.   Published online 2019 Nov 5
DOI: https://doi.org/10.3365/KJMM.2019.57.11.741

Abstract
With the increased use of diverse electronics in the high frequency spectrum, high-performance absorbing and shielding materials are needed to ensure electromagnetic compatibility. Microwave absorbance of polymer composites of carbonyl iron powders with frequency selective surface (FSS) is investigated, focusing on the frequency of 5.8 GHz. Composite sheets were prepared..... More

                           Cited By 2
Optimization of the CMP Process with Colloidal Silica Performance for Bulk AlN Single Crystal Substrate
Hyo Sang Kang, Joo Hyung Lee, Jae Hwa Park, Hee Ae Lee, Won Il Park, Seung Min Kang, Sung Chul Yi
Korean J. Met. Mater. 2019;57(9):582-588.   Published online 2019 Aug 21
DOI: https://doi.org/10.3365/KJMM.2019.57.9.582

Abstract
Chemical mechanical polishing (CMP) of bulk AlN was performed with colloidal silica slurry at pH 9 for different times. The result shows that colloidal silica slurry at pH 9, which has the relatively high surface charge of -50.7 mV is most stable, and it was selected as chemically optimum condition..... More

                           Cited By 2
Effect of Rapid Thermal Annealing Temperature on Oxygen-Deficient TiO<sub>2-x</sub>-based Thin-Film Transistors Deposited by RF Magnetron Sputtering
RF 마그네트론 스퍼터링으로 증착한 산소 결핍 구조 TiO2-x 박막 트랜지스터에 미치는 급속 열처리 온도의 영향
Han-Sang Kim, Jae-Yun Lee, Sung-Jin Kim
김한상, 이재윤, 김성진
Korean J. Met. Mater. 2019;57(7):438-446.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.438

Abstract
We investigated the effect of rapid thermal annealing (RTA) temperature report on oxygendeficient rutile TiO2-x thin-film transistors deposited by RF magnetron sputtering. Amorphous TFTs that use TiO2-x semiconductors as an active layer can be fabricated by low-temperature process and show remarkable electrical performance. The RTA post-annealing process provides greater production..... More

                           Cited By 1
Characterization of the Laser Surface Nitriding of Ti-6Al-4V Alloys in Nitric Acid Solution and Nitrogen Gas Atmosphere
질산용액 및 질소가스 분위기에서 Ti-6Al-4V 합금의 레이저 표면질화 특성분석
Tae-woo Hwang, Sang-wook Han, Il-yeong Oh, Young-hoon Moon
황태우, 한상욱, 오일영, 문영훈
Korean J. Met. Mater. 2019;57(7):412-421.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.412

Abstract
Laser nitriding is a surface engineering technique that is being used on titanium alloys to improve their surface hardness and wear resistance. It is an attractive process because of its simplicity and the possibility of producing hard layers of substantial depth with minimum effect to the bulk of the material...... More

                           Cited By 2
Influence of the Thickness of TiO<sub>2</sub>/TiO<sub>2-x</sub> Layers on the Behavior of a Memristor Device
TiO2/TiO2-x 박막층의 두께가 멤리스터 소자의 특성에 미치는 영향
Han-Sang Kim, Sung-Jin Kim
김한상, 김성진
Korean J. Met. Mater. 2019;57(2):84-90.   Published online 2019 Feb 5
DOI: https://doi.org/10.3365/KJMM.2019.57.2.84

Abstract
Memristors have been extensively investigated as the fourth fundamental circuit element. Titanium oxide is a common material used to fabricate memristors. In this paper, we investigated the influence of the thickness of the oxide active layer on the Al/TiO2-x/TiO2/heavily doped electrode memristor architecture. An insulating TiO2 thin-film was deposited using..... More

                           Cited By 4
Electrical and Optical Investigation of the Growth Behavior of Au Nanoparticles Fabricated on Various Matrix Materials by the Alternating Sputtering Method
교번스퍼터링법에 의해 다양한 기지상 재료위에 형성된 Au 나노입자의 성장거동에 대한 전기, 광학적 분석
Bum-Joon Kim, Hyun Chul Kim, Jong-Geon Park, Kyeong-Seok Lee
김범준, 김현철, 박종건, 이경석
Korean J. Met. Mater. 2017;55(10):739-744.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.739

Abstract
Nanocomposite films, which are comprised of metal nanoparticles dispersed in a matrix layer, have attracted great interest due to their unique electrical and optical properties, which are mainly due to the excitation of localized surface plasmons. In this study, we employed an alternating sputtering method to fabricate such nanocomposite films...... More

      
Wetting Behavior of Liquids on Micro-Patterned Polymer Surfaces Fabricated by Thermal Imprinting
Kwang-Jin Bae, Wenhui Yao, Yiliang He, Young-Rae Cho
Korean J. Met. Mater. 2017;55(9):624-631.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.624

Abstract
The wetting behavior of liquids on solid surfaces is important in the study of surfaces and interfaces. In this study, the wetting behavior of deionized (DI) water and hexadecane on fluorinated and micro-patterned polymer surfaces was investigated. The sample surfaces were processed by spray coating and thermal imprinting, respectively. The..... More

         Cited By 1
Study of Solution-Processed Indium Zinc Oxide TFTs Made by Simultaneous Spin Coating and Ultraviolet Light Irradiation
스핀코팅과 자외선 조사의 동시 적용을 기반한 용액 공정형 Indium Zinc 산화물 트랜지스터 연구
Fei Shan, Sung-Jin Kim
선비, 김성진
Korean J. Met. Mater. 2017;55(8):572-575.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.572

Abstract
We investigated solution-processed indium zinc oxide (IZO) thin-film transistors (TFTs) which were fabricated by spin coating with simultaneous irradiation by ultraviolet light. The proposed treatment enhanced the efficient condensation and densification of the oxide semiconducting channel layer by decreasing oxygen-vacancy-related defects and increasing metal-oxide bonds. An IZO TFT irradiated for..... More

      
Calculation of Inductance, Capacitance, and Microwave Absorbance of Modified Square Loop Frequency Selective Surface
변형된 사각 루프 주파수 선택 표면의 인덕턴스, 커패시턴스 계산 및 전파흡수특성
Tian Liu, Sung-Soo Kim
류전, 김성수
Korean J. Met. Mater. 2017;55(6):412-418.   Published online 2017 Jun 1
DOI: https://doi.org/10.3365/KJMM.2017.55.6.412

Abstract
The square loop (SL) is the typical pattern of a frequency selective surface (FSS) with high inductance (L) and capacitance (C). In this study, modified patterns including split square loop FSS (SSL-FSS) and I-type FSS (I-FSS) are proposed, and their L and C values were estimated using the equivalent circuit..... More

         Cited By 1
The Effects of Particle Size on the Surface Properties of an HVOF Coating of WC-Co
WC-Co 초고속 화염용사코팅 표면특성에 미치는 분말입자의 크기
Tong Yul Cho, Jae Hong Yoon, Sang Hwan Yoon, Yun Kon Joo, Won Ho Choi, Young Bok Son
조동율, 윤재홍, 윤상환, 주윤곤, 최원호, 손영복
Korean J. Met. Mater. 2017;55(4):227-231.   Published online 2017 Apr 6
DOI: https://doi.org/10.3365/KJMM.2017.55.4.227

Abstract
The effects of particle size on the surface properties of HVOF spray coating were studied to improve of the durability of metal components. Micro and nano sized WC-12Co powders were coated on the surface of Inconel718, and the effects of particle size on surface properties were studied. Surface hardness was..... More

         Cited By 1
Plastic Working & Materials Processing
The Effect of Mixed Slurry of Fe and Graphite on the Characteristics of Laser Carburized Surface
레이저 침탄공정시 철과 흑연의 혼합 슬러리가 침탄특성에 미치는 효과
Won-Jong Ji, Seong-Hoon Lee, Young-Hoon Moon
지원종, 이성훈, 문영훈
Korean J. Met. Mater. 2017;55(1):16-23.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.16

Abstract
Laser surface carburizing can be achieved by a laser alloying mechanism, which includes melting the graphite coated substrate and dissolution of the graphite in the liquid state. The drawback of laser carburizing is that process-induced cracks frequently form on the carburized surface as a result of carbon enrichment and the..... More

         Cited By 3
Catalytic Activity and Surface Characteristics of WO<sub>3</sub>-doped MnO<sub>x</sub>-TiO<sub>2</sub> Catalysts for Low-temperature Selective Catalytic Reduction of NO<sub>x</sub> with NH<sub>3</sub>
Byeongkil Shin, Heesoo Lee, Hyun Park
Korean J. Met. Mater. 2016;54(10):787-792.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.787
Abstract
The effect of added WO3 on the catalytic activity and surface characteristics of the MnOx-TiO2 system was investigated for the low-temperature selective catalytic reduction of NOx with NH3. Based on physio-chemical characterizations, the specific surface areas of the WO3-MnOx-TiO2 catalysts increased from 76.12 m2/g to 90.29 m2/g as the WO3... More
         Cited By 1
Electronic Materials
The Effects of Bis(3-Sulfo-Propyl)di-Sulfide (SPS) Additives on the Surface Morphology and Mechanical Properties of Electrolytic Copper Foil
전해 동박의 표면 형상 및 기계적 물성에 미치는 SPS 첨가제 영향
Tae-Gyu Woo
우태규
Korean J. Met. Mater. 2016;54(9):681-687.   Published online 2016 Sep 5
DOI: https://doi.org/10.3365/KJMM.2016.54.9.681

Abstract
In this study the effects of Bis(3-Sulfo-Propyl)di-Sulfide (SPS) on the elongation, surface morphology and crystal structure of electrolytic copper foil were investigated. Additives HEC (hydroxyethyl cellulose) (A), SPS(B), Coll-A(C) were used in the study, and the additive used as D was a Cl- ion. The study results show that there..... More

         Cited By 5
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