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Effects of Solution and Aging Treatments on the Microstructure and Mechanical Properties of Al-5.2Si-3.4Cu-0.28Mg Alloy
Al-5.2Si-3.4Cu-0.28Mg 합금의 미세조직 및 기계적 특성에 미치는 용체화 및 시효 열처리의 영향
Yi Je Cho, Jeki Jung, Yong Ho Park
조의제, 정제기, 박용호
Korean J. Met. Mater. 2017;55(12):888-895.   Published online 2017 Dec 4
DOI: https://doi.org/10.3365/KJMM.2017.55.12.888

Since strength and ductility have a trade-off relationship in Al alloys, controlling these properties using heat treatments requires careful attention to the dissolution and evolution of the reinforcing phases. In this study, the effects of solution and aging treatments on the microstructure and mechanical properties of Al-5.2Si-3.4Cu-0.28Mg alloy were investigated...... More

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Fabrication of the High-Entropy Alloys and Recent Research Trends: A Review
고엔트로피 합금의 제조 방법과 연구 동향: 리뷰
Dami Yim, Hyoung Seop Kim
임다미, 김형섭
Korean J. Met. Mater. 2017;55(10):671-683.   Published online 2017 Sep 28
DOI: https://doi.org/10.3365/KJMM.2017.55.10.671

Abstract: High-entropy alloys (HEAs), which are defined as a single phase crystalline solid solution with the composition of each constituent element in the range of 5-35 at%, have been the subject of intensive study in the last decade. Most of the HEA research is focused on alloy design, microstructural characterization,..... More

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A Study on the Soft Magnetic Properties and Compaction Density of Fe-based Nanocrystalline Powder Cores Mixed with Permalloy Powders
퍼멀로이 분말이 혼합된 철계 나노결정립 분말코어의 성형밀도와 연자성 특성에 관한 연구
Jeong Hoon Shin, Young Mok Jeong, Keun Yong Sohn, Won-Wook Park
신정훈, 정영목, 손근용, 박원욱
Korean J. Met. Mater. 2017;55(9):645-650.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.645

In this paper, the soft magnetic properties and compaction density of Fe-Si-B-Nb-Cu nanocrystalline powder cores, mixed with two kinds of permalloy powders (Ni70Fe30 or Ni50Fe50), have been closely studied. Permalloy powders having an average diameter of 4μm were added in the range of 5 to 15 wt%, and the powder..... More

Sintering of a Nanostructured CoZr-ZrO2 Composite from Mechanochemically Synthesized Powders
기계화학적 합성과 나노구조 CoZr-ZrO2 복합재료 소결
In-Jin Shon, Jin-Kook Yoon, Kyung-Tae Hong
손인진, 윤진국, 홍경태
Korean J. Met. Mater. 2017;55(9):632-636.   Published online 2017 Aug 30
DOI: https://doi.org/10.3365/KJMM.2017.55.9.632

Since their development in the 1970s ZrO2 ceramics have been shown to be promising alternative materials for total hip arthroplasty (THA) and total knee arthroplasty (TKA). However, ZrO2 is so brittle that in vivo failure can result from fracture of the ceramic femoral head and fracture of the ceramic acetabular..... More

Electromagnetic Noise Absorption by Conductive Grid Films Prepared by Screen Printing Process
스크린 인쇄공정으로 제조한 그리드 전도막의 전자기 노이즈 흡수특성
Min-Sung Kim, Sung-Soo Kim
김민성, 김성수
Korean J. Met. Mater. 2017;55(8):576-580.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.576

To realize focused design near-field conduction noise absorbers for sub-GHz frequencies, this study proposes screen-printed conductive grid films. The films’ advantages include large-scale production and easy control of electrical properties. A conductive grid film with a resistance value of approximately 70 Ω was screen printed on polyimide film substrate and..... More

Effect of Al and Zr Contents on Mechanical Properties of Ni-Al-Bronze
니알브론즈의 기계적 특성에 미치는 알루미늄 및 지르코늄 함량의 영향
Jee Hyuk Ahn, Dong Wook Kim, Min Soo Kim, Jong-Hyun Hwang, Seung Zeon Han
안지혁, 김동욱, 김민수, 황종현, 한승전
Korean J. Met. Mater. 2017;55(8):537-543.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.537

To study the effect of Al and Zr contents on the microstructural changes and tensile properties of Ni-Al-Bronze alloy, seven specimens were cast with different Al and Zr contents. The microstructure observation revealed that all specimens were composed of β’ and κ phases in a α matrix. With increasing Al..... 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

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

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Influence of Ultrasonic Melt Treatment and Cooling Rates on the Microstructural Development and Elevated Temperature Mechanical Properties of a Hypereutectic Al-18Si-4Cu-3Ni Piston Alloy
초음파 용탕 처리 및 냉각속도가 Al-18Si-4Cu-3Ni 피스톤용 합금의 미세조직과 고온인장특성에 미치는 영향
Jea-Hee Yoon, Young-Hee Cho, Jae-Gil Jung, Jung-Moo Lee, Ik Min Park
윤재희, 조영희, 정재길, 이정무, 박익민
Korean J. Met. Mater. 2017;55(6):396-404.   Published online 2017 Jun 1
DOI: https://doi.org/10.3365/KJMM.2017.55.6.396

The influence of ultrasonic melt treatment (UST) combined with a change in cooling rates on the microstructure and elevated temperature mechanical properties of a hypereutectic Al-18Si-4Cu-3Ni piston alloy was investigated. Microstructural observation confirmed that UST effectively refined the sizes of primary Si and intermetallic compounds (e.g. ε-Al3Ni) while promoting their..... More

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Effect of Annealing Temperature on the Microstructure, Tensile Properties, and Fracture Behavior of Cold-Rolled High-Mn Light-Weight Steels
고망간 경량철강 냉연판재의 미세조직, 인장특성 및 파괴거동에 미치는 어닐링 온도의 영향
Jae-hyun Lee, Seong-Jun Park, Joonoh Moon, Jun-Yun Kang, Jun-Young Park, Tae-Ho Lee, Kyung Mox Cho
이재현, 박성준, 문준오, 강전연, 박준영, 이태호, 조경목
Korean J. Met. Mater. 2017;55(5):363-371.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.363
The effects of the annealing temperature on the microstructure and tensile properties of cold-rolled light-weight steels are investigated using two Fe-30Mn-xAl-0.9C alloys that contain different Al content. The initial alloy microstructure is composed of a single austenite or a mixture of austenite and ferrite depending on the nominal aluminum content.... More
       Crossref 7
High-strength Ti Alloy Prepared via Promoting Interstitial-Carbon Diffusion
침입형 탄소 확산을 이용하여 제조한 고강도 Ti 합금
Bo-Young Kim, Se-Hyun Ko, Jae-Chul Lee
김보영, 고세현, 이재철
Korean J. Met. Mater. 2017;55(5):342-347.   Published online 2017 May 9
DOI: https://doi.org/10.3365/KJMM.2017.55.5.342

Feasibility studies are performed to determine the suitability of a novel simple synthesis technique for fabricating a new Ti alloy with improved strength and ductility, while exhibiting lower cell toxicity. Through consolidating pure Ti powders under a C atmosphere at elevated temperatures, a bulk form of the Ti alloy, in..... More

       Crossref 1
Physical Properties of AR-Glass Fibers in Continuous Fiber Spinning Conditions
연속섬유 방사 조건에 따른 AR-glass 섬유의 물리적 특성
Ji-Sun Lee, MiJai Lee, Tae-Young Lim, Youngjin Lee, Dae-Woo Jeon, Soong-Keun Hyun, Jin-Ho Kim
이지선, 이미재, 임태영, 이영진, 전대우, 현승균, 김진호
Korean J. Met. Mater. 2017;55(4):290-295.   Published online 2017 Apr 6
DOI: https://doi.org/10.3365/KJMM.2017.55.4.290

In this study, a glass fiber is fabricated using a continuous spinning process from alkali resistant (AR) glass with 4 wt% zirconia. In order to confirm the melting properties of the marble glass, the raw material is placed into a Pt crucible and melted at 1650 ℃ for 2 h,..... More

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The Effect of Ultrasonic Melt Treatment on the Microstructure and Mechanical Properties of Al-7Si-0.35Mg Casting Alloys
초음파 용탕 처리가 Al-7Si-0.35Mg 알루미늄 합금의 미세조직 및 기계적 특성에 미치는 영향
Soo-Bae Kim, Young-Hee Cho, Jung-Moo Lee, Jae-Gil Jung, Su Gun Lim
김수배, 조영희, 이정무, 정재길, 임수근
Korean J. Met. Mater. 2017;55(4):240-246.   Published online 2017 Apr 6
DOI: https://doi.org/10.3365/KJMM.2017.55.4.240

The effect of ultrasonic melt treatment (UST) on the microstructure and mechanical properties of Al-7Si-0.35Mg (A356) casting alloys was investigated. The particular aim of this study was to analyze the mechanism involved in the strengthening of the A356 alloys when fabricated by UST. The UST had little effect on the..... More

       Crossref 5
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

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

       Crossref 5
Enhancement of the Opto-Electrical Properties of Ag Intermediate ZTO Films by Vacuum Annealing
Hyun-Joo Moon, Daeil Kim
Korean J. Met. Mater. 2017;55(3):209-212.   Published online 2017 Mar 3
DOI: https://doi.org/10.3365/KJMM.2017.55.3.209

Sn-doped ZnO (ZTO)/Ag/ZTO tri-layer films were deposited on glass substrates by radio frequency (RF) and direct current (DC) magnetron sputtering and then vacuum annealed at 100, 200 and 300 ℃ for 30 min with a proportions of H2/N2 gas flow of 6/6 sccm, to investigate the effects of annealing temperature..... More

Study of Novel EUV Absorber:Nickel & Nickel Oxide
새로운 EUV 흡수체 연구:니켈 & 니켈 산화물
Dong Gon Woo, Jung Hwan Kim, Jung Sik Kim, Seongchul Hong, Jinho Ahn
우동곤, 김정환, 김정식, 홍성철, 안진호
Korean J. Met. Mater. 2017;55(3):198-201.   Published online 2017 Mar 3
DOI: https://doi.org/10.3365/KJMM.2017.55.3.198
The shadowing effect is one of the most urgent issues yet to be solved in high-volume manufacturing using extreme ultraviolet lithography (EUVL). Many studies have been conducted to mitigate the unexpected results caused by shadowing effects. The simplest way to mitigate the shadowing effect is to reduce the thickness of... More
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Effect of Graphene Addition on Mechanical Properties of TiN
그래핀 첨가가 TiN 기계적 성질에 미치는 영향
In-Jin Shon, Jin-Kook Yoon, Kyung-Tae Hong
손인진, 윤진국, 홍경태
Korean J. Met. Mater. 2017;55(3):179-183.   Published online 2017 Mar 3
DOI: https://doi.org/10.3365/KJMM.2017.55.3.179

Despite of many attractive properties of TiN, the current concern about the TiN focuses on its low fracture toughness below the ductile-brittle transition temperature. To improve its mechanical properties, the approach generally utilized has been the addition of a second phase to form composites and to make nanostructured materials. In..... More

Influence of Nickel Thickness and Annealing Time on the Mechanical Properties of Intermetallic Compounds Formed between Cu-Sn Solder and Substrate
Cu-Sn계 솔더와 기판 사이의 Ni층의 두께와 열처리 시간에 따른 금속간화합물의 기계적 특성
Yiseul Kim, Jeehye Kwon, Dayoung Yoo, Sungkyu Park, Dajeong Lee, Dongyun Lee
김이슬, 권지혜, 유다영, 박성규, 이다정, 이동윤
Korean J. Met. Mater. 2017;55(3):165-172.   Published online 2017 Mar 3
DOI: https://doi.org/10.3365/KJMM.2017.55.3.165

Intermetallic compounds (IMCs) developed on the interface between a solder alloy and its bonding pads are an important factor in the failure of electronic circuits. In this study, the mechanical behaviors of the IMCs formed in the Cu-Ni-Sn ternary alloy system are investigated. Presumably, Ni can act as a diffusion..... More

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Effect of Graphene Addition on the Mechanical Properties of TiO2
TiO2 기계적 성질에 미치는 그래핀 첨가 영향
In-Jin Shon
Korean J. Met. Mater. 2017;55(2):110-114.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.110

Despite of the many attractive properties of TiO2, its low fracture toughness limits many industrial applications. To improve its fracture toughness, the approach commonly utilized has been the addition of a second phase, to form composites, and to make nanostructured composites. In this regard, highly dense nanostructured TiO2 and TiO2-graphene..... More

       Crossref 3
Effect of Added Gas-Atomized Al-Si/SiCp Composite Powder on the Sinterability and Mechanical Properties of Alumix 431 fabricated by Hot-Pressing Process
Eunsun Lee, Jeong-Jung Oak, Yongjin Kim, Yongho Park
Korean J. Met. Mater. 2017;55(2):98-109.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.98

The aim of this study is to establish an optimized hot-press sintering condition for aluminum matrix composites (AMCs) by analyzing their sintered microstructure and mechanical properties. The fabricated AMCs in this study consisted of a blend of commercial Ecka Alumix 431 powder, and Al-Si/SiCp powder manufactured by gas atomizer (Al-Si/SiCp)...... More

       Crossref 1
Study on the Mechanical Properties and Corrosion Behaviors of Fe-(20, 45) wt% Gd Intermetallics
Fe-(20, 45) wt% Gd 금속간 화합물의 기계적 특성 및 부식 거동 연구
Bo Kyeong Kang, Youl Baik, Yong Choi, Byung Moon Moon
강보경, 백열, 최용, 문병문
Korean J. Met. Mater. 2017;55(2):91-97.   Published online 2017 Feb 2
DOI: https://doi.org/10.3365/KJMM.2017.55.2.91

Fe-(20, 45 wt%) Gd intermetallics were vacuum arc melted as the mother alloy of a neutron shielding and absorbing material. The structure of the cast Fe-20 wt% Gd intermetallics had primary dendrites with a short width of about 2 μm, which became coarse with increasing Gd content. The final compositions..... More

       Crossref 1
Material Analysis & Characterization
Effects of Doping Concentration on the Structural and Optical Properties of Spin-Coated In-doped ZnO Thin Films Grown on Thermally Oxidized ZnO Film/ZnO Buffer Layer/Mica Substrate
Byunggu Kim, Jae-Young Leem
Korean J. Met. Mater. 2017;55(1):67-71.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.67

ZnO buffer layers were deposited on mica substrates using a sol-gel spin coating method. Then, a thin film of metallic Zn was deposited onto the ZnO buffer layer/mica substrate using a thermal evaporator, and the deposited Zn thin films were then thermally oxidized in a furnace at 500 ℃ for..... More

       Crossref 1
Modeling and Simulation
Numerical Simulation of Yttrium Aluminum Garnet(YAG) Single Crystal Growth by Resistance Heating Czochralski(CZ) Method
저항가열 초크랄스키법에 의한 야그 단결정 성장의 전산모사 연구
Myeong Hyeon You, Pil Ryung Cha
유명현, 차필령
Korean J. Met. Mater. 2017;55(1):60-66.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.60

Yttrium Aluminum Garnet (YAG) single crystal has received much attention as the high power solid-state laser’s key component in industrial and medical applications. Various growth methods have been proposed, and currently the induction-heating Czochralski (IHCZ) growth method is mainly used to grow YAG single crystal. Due to the intrinsic properties..... More

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

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

       Crossref 4
Effect of Aging Time and Temperature on Microstructure and Mechanical Properties of Ti-39Nb-6Zr Alloy
Ti-39Nb-6Zr 합금의 시효처리를 통한 미세조직 및 기계적 특성 제어
Hyun Jun Kwon, Ka Ram Lim, Yong Tae Lee, Dong Geun Lee, Jun Hee Lee, Seung Eon Kim
권현준, 임가람, 이용태, 이동근, 이준희, 김승언
Korean J. Met. Mater. 2016;54(12):925-930.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.925

The aim of this study is to optimize the microstructure and mechanical properties of Ti-39Nb-6Zr (TNZ40) for bio-implant applications. TNZ40 was designed to have a low elastic modulus (~40 GPa) and good biocompatibility. However, the alloy shows relatively low strength compared to other titanium alloys for bio-implant. In the present..... More

       Crossref 5
Effect of Bonding Pressure and Bonding Time on the Tensile Properties of Cu-Foam / Cu-Plate Diffusion Bonded Joint
Cu foam / Cu plate 간 고상확산접합부의 인장성질에 미치는 접합압력과 유지시간의 영향
Sang-Ho Kim, Hoe-Jun Heo, Tae-Jin Yoon, Chung-Yun Kang
김상호, 허회준, 윤태진, 강정윤
Korean J. Met. Mater. 2016;54(12):899-907.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.899

Open cell Cu foam, which has been widely utilized in various industries because of its high thermal conductivity, lightweight and large surface area, was successfully joined with Cu plate by diffusion bonding. To prevent excessive deformation of the Cu foam during bonding process, the bonding pressure should be lower than..... More

       Crossref 1
Rapid Sintering of Nanocrystalline SiC-Graphene Composites
나노구조 SiC-Graphene 복합재료 급속소결
In-Jin Shon
Korean J. Met. Mater. 2016;54(12):893-898.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.893

The low mechanical properties of SiC limit its wide application despite many attractive properties. To improve the mechanical properties, a second phase has been generally added to make a nanostructured composite. In this respect, graphene was evaluated as the reinforcing agent of SiC. SiC-graphene composites were sintered within 2 min..... More

       Crossref 3
Evaluation of Material Properties on the Inner Surface of Cr Plated Cladding Tube for Preventing Fuel-Cladding Chemical Interaction
FCCI 방지를 위한 내면 Cr 도금 피복관의 물성 평가
Jun Hwan Kim, Byoung Oon Lee, Jin Sik Cheon, Sung Ho Kim
김준환, 이병운, 천진식, 김성호
Korean J. Met. Mater. 2016;54(11):855-861.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.855
Studies were carried out to apply electroplating technique to the inner surface of a nuclear fuel cladding tube to prevent a fuel-cladding chemical interaction (FCCI) in a sodium-cooled fast reactor (SFR). 20 μm thick Cr was uniformly plated onto the inner surface of a HT9 cladding tube with a 7.4... More
       Crossref 1
Synthesis and Rapid Sintering of Nanocrystalline CoTi-ZrO2 Composite
나노구조 CoTi-ZrO2 복합재료 합성과 급속소결
In-Jin Shon
Korean J. Met. Mater. 2016;54(11):826-830.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.826

CoTi and ZrO2 nanopowders were mechanochemically synthesized from CoTiO3 and Zr powders according to the reaction (2CoTiO3 + 3Zr → 2CoTi + 3ZrO2). The milled powders were then consolidated by pulsed current-activated sintering within two minutes under an applied pressure of 80MPa. The average hardness and fracture toughness of the..... More

       Crossref 3
The Effects of Cooling Rate on the Microstructure and Mechanical Properties of Ti40Zr10Cu36Pd14 Metallic Glass Matrix Composites
Ti40Zr10Cu36Pd14 비정질기지 복합재의 미세조직과 기계적 특성에 미치는 냉각속도의 영향
Seon Yong Park, Ka Ram Lim, Young Sang Na, Seong Eon Kim, Youn Suk Choi
박선용, 임가람, 나영상, 김승언, 최윤석
Korean J. Met. Mater. 2016;54(11):802-807.   Published online 2016 Nov 5
DOI: https://doi.org/10.3365/KJMM.2016.54.11.802

In this paper, we demonstrate that the microstructure and mechanical properties in the Ti40Zr10Cu36Pd14 alloy can be tailored by controlling the cooling rate during solidification. A lower cooling rate increases the volume fraction of crystalline phase such as B2 but decreases the free volume of the glassy matrix. The increase..... More

Fabrication of Si/SiOx Anode Materials by a Solution Reaction-Based Method for Lithium Ion Batteries
Hyeon-Woo Yang, Jung-Ho Lee, Sang-Chul Jung, Seung-Taek Myung, Woo-Seung Kang, Sun-Jae Kim
Korean J. Met. Mater. 2016;54(10):780-786.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.780

Si/SiOx composite anodes were prepared using a facile solution reaction-based method. Their initial capacity was significantly improved to 1.3 times that of SiOx by incorporating 3 wt% silicon nanoparticles into the SiOx. The capacity retention of the Si/SiOx anodes after 50 charge-discharge cycles was significantly enhanced, to 99%, compared with..... More

       Crossref 5
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