Search Results 1-20 of 14992

  • Cutting Behaviors of Fine Hole Drilling of Ti-6Al-4V Alloy with Micro-drills  [in Japanese]

    澤井 猛

    チタン = Titanium Japan 69(1), 39-41, 2021-01

  • Low Cycle Fatigue Properties in Forged TiAl Alloy Ti-43Al-5V-4Nb with Triplex Microstructure  [in Japanese]

    NAKATANI Masanori , SHIMONO Akiyuki , YAMAMOTO Takaei , HIYOSHI Noritake , ITOH Takamoto

    … <p>The low cycle fatigue (LCF) properties of the TiAl alloy Ti-43Al-5V-4Nb (at.%) with triplex microstructure have been investigated. …

    Journal of the Society of Materials Science, Japan 70(2), 111-117, 2021

    J-STAGE 

  • Numerical Analysis of Fillet Shape and Molten Filler Flow during Brazing in the Al–Si Alloy of Automotive Radiator

    Tanaka Hirokazu

    … <p>In the brazing process of an automobile radiator, eutectic melting of the Al–Si filler alloy of the clad sheets, fillet formation in the brazed joints, and the flow of the molten filler metal on the solid core metal between joints occur continuously. …

    MATERIALS TRANSACTIONS, 2021

    J-STAGE 

  • Time-resolved and <i>in-situ</i> Observation of Semisolid Deformation in Al–Cu Alloys with Equiaxed and Columnar Grain Structures by Using a Combination Technique of 4D-CT and 3DXRD

    Narumi Taka , Nakata Takumi , Kobayashi Ryuya , Yasuda Hideyuki

    … During the compression tests of a semisolid Al–10mass%Cu alloy with the equiaxed grain structure, translation and rotation of solid grains rather than the plastic deformation played a dominant role in the deformation until strain reached -0.04. … For a semisolid Al–10mass%Cu alloy with the columnar grain structure, solid grain comprised a single crystallographic domain. …

    ISIJ International, 2021

    J-STAGE 

  • Effect of Bending-Tension Deformation on Texture Evolution and Room Temperature Formability of AZ31 Alloy Sheet Rolled at High Temperature  [in Japanese]

    Ishiguro Yuya , Huang Xinsheng , Tsukada Yuhki , Koyama Toshiyuki , Chino Yasumasa

    … <p>Bending-tension deformations were conducted to AZ31B (Mg-3 mass%Al-1 mass%Zn) alloy sheets with weak basal texture intensity and RD (rolling direction)-split texture, which were processed by high-temperature rolling. … 7 pass bending-tension deformation increased basal texture intensity from 2.9 to about 4.5, which was still much lower than those of commercial AZ31B alloy sheets. …

    Journal of the Japan Institute of Metals and Materials, 2021

    J-STAGE 

  • Evaluation of grain refining performance of aluminum cast using TP-1 test mold  [in Japanese]

    Watanabe Yoshimi , Kagimoto Ryo , Iwata Soichiro , Yamada Motoko , Mihara-Narita Mami , Sato Hisashi , Shimasaki Shin-ichi

    … <p>AA-TP1 (Standard Test Procedure for Aluminum Alloy Grain Refiners; … Effects of temperature of molten metal, holding time after addition of refiner (Al-5%Ti-1%B) and preheating temperature of the mold for microstructure of as-cast pure Al were examined. …

    Journal of Japan Institute of Light Metals 71(1), 8-15, 2021

    J-STAGE 

  • Evaluation of wave-like nucleation events in Al-4%Si alloys with addition of TiB<sub>2</sub> particles by time-resolved and in-situ observation  [in Japanese]

    Yasuda Hideyuki , Nogita Kazuhiro

    … <p>This paper proposes a technique for evaluating the nucleation sequence and grain refinement phenomena during solidification of a metallic alloy. … Time-resolved and in-situ transmission imaging using a monochromatized X-ray in a synchrotron radiation facility, SPring-8, showed wave-like nucleation events, in which nucleation sequentially occurred along the temperature gradient, in an Al-4mass%Si alloy with addition of TiB<sub>2</sub> …

    Journal of Japan Institute of Light Metals 71(1), 22-29, 2021

    J-STAGE 

  • Effect of aluminum content on stress corrosion cracking of AM60B and AZ91D magnesium alloy ingots  [in Japanese]

    Okumura Hayato , Kouda Takashi , Yamamoto Nobuyoshi , Kamado Shigeharu

    … In this paper, the effect of aluminum content on SCC of magnesium alloy ingots, AM60B and AZ91D, is evaluated using Slow Strain Rate Testing (SSRT) in two environments: (1) air and (2) 5%NaCl solution controlled from pH10 to pH11 with Mg (OH)<sub>2</sub>. … In AZ91D specimens, accelerated corrosion is observed around Mg<sub>17</sub>Al<sub>12</sub> … To investigate the relationship between Mg<sub>17</sub>Al<sub>12</sub> …

    Journal of Japan Institute of Light Metals 71(1), 60-67, 2021

    J-STAGE 

  • Hydrogen solubility and removal by vacuum treatment for molten AC2B aluminum alloy  [in Japanese]

    Yamazaki Yuki , Hiraki Takehito , Suzumura Takahiro , Miki Takahiro , Sasaki Yasushi , Nagasaka Tetsuya

    … <p>Extremely low levels of hydrogen concentration in molten aluminum cast alloy has been required for the production of high-performance alloys. … AC2B (Al-5.0~7.0mass%Si-2.0~4.0mass%Cu) alloy, which is one of the typical aluminum casting alloys, is mainly used for the automobile industry. … It is expected that vacuum treatment of molten alloy can lead to small oxidation loss of metal and excellent hydrogen removal. …

    Journal of Japan Institute of Light Metals 71(1), 44-50, 2021

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  • A Cobalt-Nickel Metal-Alloy Thin-Film Sensor for Hydrogen-Phosphate Ion

    NAKAMURA Hideyasu , TAKASE Satoko , SHIMIZU Youichi

    … <p>Cobalt-nickel alloy thin-films were prepared by electrodepositing on Au-coated Al<sub>2</sub>O<sub>3</sub> …

    Analytical Sciences 37(2), 337-340, 2021

    J-STAGE 

  • Effect of Rolling Temperature on Room Temperature Formability and Texture Formation of Mg-3 mass%Al-1 mass%Sn Alloy Sheet  [in Japanese]

    Fukuoka Hitoshi , Huang Xinsheng , Suzuki Kazutaka , Tsukada Yuhki , Koyama Toshiyuki , Chino Yasumasa

    … <p>Effect of rolling temperature on room temperature formability and texture formation of Mg-3 mass%Al-1 mass%Sn (AT31) alloy sheet was investigated, and compared with the results of Mg-3 mass%Al-1 mass%Zn (AZ31) alloy sheet. … When the rolling temperature was set to a high temperature (798 K), AT31 alloy showed almost the same basal texture intensity as AZ31 alloy rolled at the same condition. …

    Journal of the Japan Institute of Metals and Materials, 2021

    J-STAGE 

  • Work Softening Phenomena in Al–Fe Alloys: The Impurity-Scavenging Effect of the θ-Al<sub>13</sub>Fe<sub>4</sub> Phase

    Hara Toshihiro , Egusa Daisuke , Mihara Mami , Tanaka Hiroki , Ohnuma Ikuo , Abe Eiji

    … <p>We have investigated the work softening (WS) phenomena during a cold-roll process of an Al–Fe alloy, based on hardness measurements, electron microscopy observations, and thermodynamic calculations. … The WS behavior was confirmed in the Al–Fe alloy when the rolling rate was larger than 80%, which contained fine grains with severe deformation. …

    MATERIALS TRANSACTIONS, 2021

    J-STAGE 

  • Silicon Refining by Solidification from Liquid Si–Zn Alloy and Floating Zone Method

    Ma Yuanjia , Yasuda Kouji , Ido Akifumi , Shimao Takeyuki , Zhong Ming , Hagiwara Rika , Nohira Toshiyuki

    … The distribution behaviors of impurity elements during the precipitation of solid silicon from a liquid Si–Zn alloy were studied by thermodynamic calculations at 923 K. … In the precipitation experiment, silicon granules were recovered from a liquid Si–Zn alloy, which was prepared from metallurgical-grade silicon. … The impurity removal ratios exceeded 99% for C, Al, and Ca, and 90% for Fe. …

    MATERIALS TRANSACTIONS, 2021

    J-STAGE 

  • Effect of Refractory Coating on Oxidation of JIS AD 12.1 Molten Aluminum Alloy  [in Japanese]

    Hasegawa Yutaka , Toyoda Michihiro , Morinaka Mayuki

    … <p>  In this report, the effect of refractory coating agent on the oxidation of molten aluminum alloy was investigated. … AD12.1 molten alloy was poured into them and they were observed by SEM-EDX after four and six days. …

    Journal of Japan Foundry Engineering Society 93(1), 3-10, 2021

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  • Effect of surface modification of Ti-6Al-4V alloy by electron cyclotron resonance plasma oxidation

    OIKAWA Mayumi , MASUMOTO Hiroshi , SHIRAISHI Naru , ORII Yusuke , ANADA Takahisa , SUZUKI Osamu , SASAKI Keiichi

    … <p>Ti-6Al-4V alloy is used as biomaterials for dental and orthopedic implants because of their excellent biocompatibilities and mechanical properties. … However, it is unclear that electron cyclotron resonance (ECR) plasma oxidation can create the oxide films on Ti-6Al-4V alloy surface, and this technique improves the ability of its osseointegration. …

    Dental Materials Journal 40(1), 228-234, 2021

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  • Effect of HIP treatment on mechanical properties of TiAl4822 alloy additively manufactured by electron beam melting  [in Japanese]

    MIZUTA Kazuhiro , INOUE Kana , GOKAN Kazuhiro , KAKEHI Koji

    … <p>One of the lightweight heat-resistant alloys, Ti-48Al-2Cr-2Nb (TiAl4822), has already been adopted to turbine blades for jet engines, but is manufactured by casting which requires expensive post process. … On the other hand, the microscopic analysis by EBSD revealed that the HIP treatment increased the average diameter of the grain and widened the distribution of grain size, with the increase of the area fraction of Ti<sub>3</sub>Al(α<sub>2</sub>). …

    Transactions of the JSME (in Japanese) 87(893), 20-00330-20-00330, 2021

    J-STAGE 

  • Temperature-Dependent Deformation Behavior of Al–Mg–Sc Alloys Fabricated by Multi-Directional Forging at Room Temperature

    Yamazaki Shunsuke , Sawa Syutaro , Watanabe Chihiro , Monzen Ryoichi , Aoba Tomoya , Miura Hiromi

    … <p>Ultrafine-grained Al–Mg–Sc alloys were fabricated by multi-directional forging (MDF) with different number of forging passes of 3, 9 and 15, i.e., to cumulative strains of ΣΔε = 1.2, 3.6 and 6.0, at room temperature. … Peak-aging treatments at 473 K for 172.8 ks were adopted for a portion of specimens after MDF in order to obtain finely dispersed Al<sub>3</sub>Sc precipitates. …

    MATERIALS TRANSACTIONS 62(2), 213-220, 2021

    J-STAGE 

  • The Life Assessment by Linear Cumulative Damage Rule for Cold Dwell Fatigue of Ti-6Al-4V  [in Japanese]

    OTA Yutaro , KUBUSHIRO Keiji , YAMAZAKI Yasuhiro

    … CDF is similar to creep-fatigue of some metals (stainless steel, Ni-base alloy, and so on) in the point of decrease of fatigue life with stress or strain dwell at high temperature. …

    Journal of the Society of Materials Science, Japan 70(1), 35-40, 2021

    J-STAGE 

  • Precipitation Behavior of Nitride Inclusions in K418 Alloy under the Continuous Unidirectional Solidification Process

    Yang Fan , Ren Zhongming , Zhao Wencheng , Hou Yuan , Guo Xiliang , Li Qiang , Li Xia , Yu Jianbo , Zhong Yunbo , Deng Kang

    … The precipitation behavior of nitride inclusions in K418 alloy under the continuous unidirectional solidification process was investigated by scanning electron microscopy, ASPEX Explorer, and LECO ONH-836. … The results show that there were two types of nitride inclusions in the K418 alloy ingot: TiN and complex inclusion of Al<sub>2</sub>O<sub>3</sub>–TiN. … Al<sub>2</sub>O<sub>3</sub> …

    ISIJ International 61(1), 229-238, 2021

    J-STAGE 

  • Interfacial Reactions and Inclusion Formations at an Early Stage of FeNb Alloy Additions to Molten Iron

    Wang Yong , Karasev Andrey , Park Joo Hyun , Jönsson Pär Göran

    … The interfacial reactions between FeNb alloy and liquid Fe, as well as inclusion formations, were studied during an early stage of an alloy addition using a liquid-metal-suction method. … Moreover, the Nb rich regions formed after the alloy contacted with liquid Fe could modify the existing inclusions in the alloy, also their evolution mechanisms were studied. …

    ISIJ International 61(1), 209-218, 2021

    J-STAGE 

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