Pub Date : 2023-12-01DOI: 10.2320/matertrans.mt-m2023092
Zijian Deng, Ryota Osuga, Masaki Matsubara, K. Kanie, Atsushi Muramatsu
{"title":"Effect of Contact Mode of TiO2/g-C3N4 Heterojunction on Photocatalytic Performance for Dye Degradation","authors":"Zijian Deng, Ryota Osuga, Masaki Matsubara, K. Kanie, Atsushi Muramatsu","doi":"10.2320/matertrans.mt-m2023092","DOIUrl":"https://doi.org/10.2320/matertrans.mt-m2023092","url":null,"abstract":"","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138627481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.2320/matertrans.mt-m2023062
Ichiro Seki
{"title":"Synthesis Process of Titanium Sulfides Suitable for the Manufacturing Process of Titanium via the Thermal Decomposition Process by Controlling Oxygen and Sulfur Partial Pressures in a Dilute Hydrogen Gas Flow","authors":"Ichiro Seki","doi":"10.2320/matertrans.mt-m2023062","DOIUrl":"https://doi.org/10.2320/matertrans.mt-m2023062","url":null,"abstract":"","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138615947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.2320/matertrans.mt-l2023013
Takashi Shinozaki, Jun Shimojo, Toshihiko Shinya, K. Matsumoto
{"title":"Effects of B Addition on Precipitation Behavior of β Phase in Al–Mn–Mg–B Alloys","authors":"Takashi Shinozaki, Jun Shimojo, Toshihiko Shinya, K. Matsumoto","doi":"10.2320/matertrans.mt-l2023013","DOIUrl":"https://doi.org/10.2320/matertrans.mt-l2023013","url":null,"abstract":"","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138617814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-01DOI: 10.2320/matertrans.mt-m2023111
Junyu Zhu, F. Briffod, T. Shiraiwa, Manabu Enoki, S. Emura
{"title":"High-Resolution Digital Image Correlation Analysis of Layered α/β Two-Phase Ti–12Mo Alloy under Compressive Condition","authors":"Junyu Zhu, F. Briffod, T. Shiraiwa, Manabu Enoki, S. Emura","doi":"10.2320/matertrans.mt-m2023111","DOIUrl":"https://doi.org/10.2320/matertrans.mt-m2023111","url":null,"abstract":"","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138610311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.2320/matertrans.mt-c2023004
Kentaro Hata, Takeshi Matsuda, Shinji Ootsuka
The effect of corrosion status of zinc coating on the hydrogen absorption behavior was investigated. Dry-wet corrosion test was conducted after applying NaCl solution to the zinc coated steel sheets. The permeating hydrogen during the corrosion test was measured by electrochemical technique. It was found that the hydrogen permeation was not observed at early stage of corrosion while significant hydrogen permeation was observed at middle stage of corrosion. Then, the hydrogen permeation decreased gradually at later stage of corrosion. In order to clarify the mechanism of this behavior, surface morphologies of corroded specimens were analyzed by Electron Probe Micro Analyzer. It was found that the hydrogen permeation was observed when the steel substrate was partially appeared, indicating that galvanic corrosion is related to the hydrogen permeation.
{"title":"Investigation of Relationship between Corrosion and Hydrogen Entry Behavior of Electro-Galvanized Steel under Atmospheric Environment","authors":"Kentaro Hata, Takeshi Matsuda, Shinji Ootsuka","doi":"10.2320/matertrans.mt-c2023004","DOIUrl":"https://doi.org/10.2320/matertrans.mt-c2023004","url":null,"abstract":"The effect of corrosion status of zinc coating on the hydrogen absorption behavior was investigated. Dry-wet corrosion test was conducted after applying NaCl solution to the zinc coated steel sheets. The permeating hydrogen during the corrosion test was measured by electrochemical technique. It was found that the hydrogen permeation was not observed at early stage of corrosion while significant hydrogen permeation was observed at middle stage of corrosion. Then, the hydrogen permeation decreased gradually at later stage of corrosion. In order to clarify the mechanism of this behavior, surface morphologies of corroded specimens were analyzed by Electron Probe Micro Analyzer. It was found that the hydrogen permeation was observed when the steel substrate was partially appeared, indicating that galvanic corrosion is related to the hydrogen permeation.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135112064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The objective of this study was to optimize the cooling conditions after solution treatment of the JIS AC4CH aluminum casting alloy, and the effects of the temperature range cooled at 0.5°C/s on the microstructure and mechanical properties were investigated. The temperature range of the cooling and cooling rate were simultaneously adjusted by heating using a high-frequency induction heating apparatus and cooling by blowing air. In particular, cooling at 10°C/s (CR10) was used as the basic cooling rate, with a rate of 0.5°C/s (CR0.5) used for a portion of the temperature range. The scanning electron microscopy (SEM) observations of the specimens after cooling revealed that rod-like precipitates formed in the specimens that were cooled at CR0.5 in the range of 400–250°C. In the specimen that was cooled at CR0.5 from 500 to 450°C, granular or rod-shaped precipitates with a small aspect ratio were observed. From the results of a scanning transmission electron microscopy with energy dispersive X-ray spectroscopy (STEM-EDS) investigation, the former were identified as the Mg2Si intermediate phase, and the latter were composed mainly of Si. An electron probe micro analyzer (EPMA) was used to measure the Mg and Si concentrations in the primary α-Al phase. In the case of the temperature range for CR0.5 cooling above 350°C, the Si concentration decreased significantly as the temperature range of CR0.5 cooling increased. Considering the Si concentration distribution and diffusion distance in the primary α-Al phase, this decrease in the Si concentration could have been caused by the diffusion of Si atoms to the eutectic region. The 0.2% proof stress and tensile strength values after the artificial aging of a specimen that was cooled at CR0.5 from 400 to 350°C, where a coarse Mg2Si intermediate phase precipitated during cooling, were approximately 10% lower than those of a specimen that was cooled at CR10 over the whole temperature range.
{"title":"Effects of Cooling Conditions Immediately after Solution Treatment on Microstructures and Mechanical Properties of JIS AC4CH Aluminum Casting Alloy","authors":"Naohiro Saruwatari, Sumiya Koike, Eiji Sekiya, Yoshihiro Nakayama","doi":"10.2320/matertrans.mt-f2023001","DOIUrl":"https://doi.org/10.2320/matertrans.mt-f2023001","url":null,"abstract":"The objective of this study was to optimize the cooling conditions after solution treatment of the JIS AC4CH aluminum casting alloy, and the effects of the temperature range cooled at 0.5°C/s on the microstructure and mechanical properties were investigated. The temperature range of the cooling and cooling rate were simultaneously adjusted by heating using a high-frequency induction heating apparatus and cooling by blowing air. In particular, cooling at 10°C/s (CR10) was used as the basic cooling rate, with a rate of 0.5°C/s (CR0.5) used for a portion of the temperature range. The scanning electron microscopy (SEM) observations of the specimens after cooling revealed that rod-like precipitates formed in the specimens that were cooled at CR0.5 in the range of 400–250°C. In the specimen that was cooled at CR0.5 from 500 to 450°C, granular or rod-shaped precipitates with a small aspect ratio were observed. From the results of a scanning transmission electron microscopy with energy dispersive X-ray spectroscopy (STEM-EDS) investigation, the former were identified as the Mg2Si intermediate phase, and the latter were composed mainly of Si. An electron probe micro analyzer (EPMA) was used to measure the Mg and Si concentrations in the primary α-Al phase. In the case of the temperature range for CR0.5 cooling above 350°C, the Si concentration decreased significantly as the temperature range of CR0.5 cooling increased. Considering the Si concentration distribution and diffusion distance in the primary α-Al phase, this decrease in the Si concentration could have been caused by the diffusion of Si atoms to the eutectic region. The 0.2% proof stress and tensile strength values after the artificial aging of a specimen that was cooled at CR0.5 from 400 to 350°C, where a coarse Mg2Si intermediate phase precipitated during cooling, were approximately 10% lower than those of a specimen that was cooled at CR10 over the whole temperature range.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135112245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.2320/matertrans.mt-mi2022006
Parviz Kahhal, Hossein Ghorbani-Menghari, Hwi-Jun Kim, Hyunjoo Choi, Pil-Ryung Cha, Ji Hoon Kim
A neural network-based approach is proposed to minimize the maximum axial stress in the powder forming process. The finite element analysis was conducted using a MATLAB code and an ABAQUS python script to generate observations for the neural network training procedure. Powders of three different particle size distributions were mixed, and the mixture fractions were considered as control parameters. The artificial neural network determined the relationship between parameters and objective function. The effect of mixture fractions on maximum axial stress was analyzed. The results showed that the genetic algorithm could effectively determine the optima and the proposed method had strong prediction capability and accuracy.
{"title":"Metaheuristic Optimization of Powder Size Distribution in Powder Forming Process Using Multi-Particle Finite Element Method Coupled with Artificial Neural Network and Genetic Algorithm","authors":"Parviz Kahhal, Hossein Ghorbani-Menghari, Hwi-Jun Kim, Hyunjoo Choi, Pil-Ryung Cha, Ji Hoon Kim","doi":"10.2320/matertrans.mt-mi2022006","DOIUrl":"https://doi.org/10.2320/matertrans.mt-mi2022006","url":null,"abstract":"A neural network-based approach is proposed to minimize the maximum axial stress in the powder forming process. The finite element analysis was conducted using a MATLAB code and an ABAQUS python script to generate observations for the neural network training procedure. Powders of three different particle size distributions were mixed, and the mixture fractions were considered as control parameters. The artificial neural network determined the relationship between parameters and objective function. The effect of mixture fractions on maximum axial stress was analyzed. The results showed that the genetic algorithm could effectively determine the optima and the proposed method had strong prediction capability and accuracy.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135112247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.2320/matertrans.mt-m2023077
Nguyen Hai Yen, Kieu Xuan Hau, Nguyen Huy Ngoc, Pham Thi Thanh, Truong Viet Anh, Nguyen Huy Dan
In this work, we investigated the influence of Co on the structure and magnetic properties of Ni50−xCoxMn29Ga21 (x = 0, 2, 4, 6, and 8) shape memory alloy ribbons fabricated by using the melt-spinning method. The addition of Co increases the formation of the austenitic crystalline phase in the alloy ribbons. The crystalline grains in rod-shapes with diameter of ∼2 µm and length of ∼10 µm are mostly oriented perpendicular to the ribbon surface. The martensitic-austenitic transformation was performed on both the thermomagnetization and differential scanning calorimetry methods. With the increase of Co concentration, the martensitic-austenitic structural phase transformation temperature (TM-A) of the alloy gradually decreases while the Curie temperature of the austenite phase (TCA) of the alloy increases from 355 K (for x = 0) to 432 K (for x = 8). Besides, the martensitic-austenitic phase transformation is also significantly affected by the external magnetic field. The structural phase transformation temperature of the alloy tends to shift towards lower temperatures as the external magnetic field increases.
本文研究了Co对熔体纺丝法制备Ni50−xCoxMn29Ga21 (x = 0,2,4,6和8)形状记忆合金带的结构和磁性能的影响。Co的加入增加了合金带中奥氏体晶相的形成。直径为~ 2µm、长度为~ 10µm的棒状晶粒大多垂直于带状表面。用热磁化法和差示扫描量热法分别进行了马氏体-奥氏体相变。随着Co浓度的增加，合金的马氏体-奥氏体组织相变温度(TM-A)逐渐降低，而合金的奥氏体相居里温度(TCA)从355 K (x = 0时)升高到432 K (x = 8时)，马氏体-奥氏体相变也受外加磁场的显著影响。随着外加磁场的增大，合金的组织相变温度有向低温方向移动的趋势。
{"title":"Influence of Co on Structure and Magnetic Properties of Ni<sub>50−x</sub>Co<sub>x</sub>Mn<sub>29</sub>Ga<sub>21</sub> Shape Memory Alloy Ribbons","authors":"Nguyen Hai Yen, Kieu Xuan Hau, Nguyen Huy Ngoc, Pham Thi Thanh, Truong Viet Anh, Nguyen Huy Dan","doi":"10.2320/matertrans.mt-m2023077","DOIUrl":"https://doi.org/10.2320/matertrans.mt-m2023077","url":null,"abstract":"In this work, we investigated the influence of Co on the structure and magnetic properties of Ni50−xCoxMn29Ga21 (x = 0, 2, 4, 6, and 8) shape memory alloy ribbons fabricated by using the melt-spinning method. The addition of Co increases the formation of the austenitic crystalline phase in the alloy ribbons. The crystalline grains in rod-shapes with diameter of ∼2 µm and length of ∼10 µm are mostly oriented perpendicular to the ribbon surface. The martensitic-austenitic transformation was performed on both the thermomagnetization and differential scanning calorimetry methods. With the increase of Co concentration, the martensitic-austenitic structural phase transformation temperature (TM-A) of the alloy gradually decreases while the Curie temperature of the austenite phase (TCA) of the alloy increases from 355 K (for x = 0) to 432 K (for x = 8). Besides, the martensitic-austenitic phase transformation is also significantly affected by the external magnetic field. The structural phase transformation temperature of the alloy tends to shift towards lower temperatures as the external magnetic field increases.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135112248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.2320/matertrans.mt-m2023091
Hideo Nakajima
Open-channel aluminum with directional holes is fabricated by extraction of stainless steel wires coated with release agent, boron nitride, which are embedded in solidified aluminum. In order to extract the wires from aluminum, tensile force is necessary. If a number of wires can be extracted simultaneously, the production of open-channel aluminum with many holes becomes feasible. Smaller extraction force is desirable to fabricate open-channel aluminum with holes as many as possible. It was found that the extraction force decreases remarkably by adding magnesium hydride to boron nitride because of forming porous layers between the wires and aluminum during melting of aluminum. Besides, the extraction force is also investigated as functions of diameter and length of stainless steel wires, which decreases with decreasing diameter and length of the template wires. The results show that small contact area of the wire to aluminum results in smaller extraction force, which is attributed to decrease in friction force of the wires to aluminum.
{"title":"Fabrication of Open-Channel Aluminum by Template-Extraction Technique","authors":"Hideo Nakajima","doi":"10.2320/matertrans.mt-m2023091","DOIUrl":"https://doi.org/10.2320/matertrans.mt-m2023091","url":null,"abstract":"Open-channel aluminum with directional holes is fabricated by extraction of stainless steel wires coated with release agent, boron nitride, which are embedded in solidified aluminum. In order to extract the wires from aluminum, tensile force is necessary. If a number of wires can be extracted simultaneously, the production of open-channel aluminum with many holes becomes feasible. Smaller extraction force is desirable to fabricate open-channel aluminum with holes as many as possible. It was found that the extraction force decreases remarkably by adding magnesium hydride to boron nitride because of forming porous layers between the wires and aluminum during melting of aluminum. Besides, the extraction force is also investigated as functions of diameter and length of stainless steel wires, which decreases with decreasing diameter and length of the template wires. The results show that small contact area of the wire to aluminum results in smaller extraction force, which is attributed to decrease in friction force of the wires to aluminum.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135112063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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