Pub Date : 2017-11-17DOI: 10.2320/JINSTMET.J2017045
禎彦 半谷, 龍生 小林, 良祐 鈴木, 雅昭 松原, 暢宏 吉川
{"title":"アルミニウムチップからFriction Stir Back Extrusionにより作製したアルミニウムパイプ","authors":"禎彦 半谷, 龍生 小林, 良祐 鈴木, 雅昭 松原, 暢宏 吉川","doi":"10.2320/JINSTMET.J2017045","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2017045","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"45 1","pages":"33-38"},"PeriodicalIF":0.0,"publicationDate":"2017-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80884502","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 : 2017-09-25DOI: 10.2320/JINSTMET.JAW201704
Youhei Hirohata, Kentaro Nishida, T. Haruna, K. Noda
Thin water film is formed on metal surfaces that are exposed to the atmosphere. The conditions of this film change according to environmental factors, such as temperature, wind, and rainfall. Hence, it is difficult to investigate atmospheric corrosion on metal surfaces.This paper aimed to develop a measurement system for the pH distribution on a metal surface in simulated atmospheric envi -ronment. The surface pH distribution was measured with agar film including pH indicators and MgCl 2 . The pH indicators used were a universal indicator and an MR ︲ BTB indicator. Agar film of 0 . 5 mm thickness was placed on an iron specimen. The specimen was set in a chamber with a relative humidity of 100 ％ to prevent the agar film from drying out. The surface pH distribution was deter - mined from the color of the agar film with an RGB color model. The surface pH distribution on the iron showed that anodic reac tions produced acidic regions and cathodic reactions produced basic regions. The observed phenomena were the same as that found under a water droplet which contained the pH indicator and MgCl 2 . Therefore, we conclude that the agar film could simulate thin water film in an atmospheric environment and allow measurement of the surface pH distribution on iron under corro sion.
{"title":"Development of measurement system for ph distribution on metal surface under atmospheric corrosion","authors":"Youhei Hirohata, Kentaro Nishida, T. Haruna, K. Noda","doi":"10.2320/JINSTMET.JAW201704","DOIUrl":"https://doi.org/10.2320/JINSTMET.JAW201704","url":null,"abstract":"Thin water film is formed on metal surfaces that are exposed to the atmosphere. The conditions of this film change according to environmental factors, such as temperature, wind, and rainfall. Hence, it is difficult to investigate atmospheric corrosion on metal surfaces.This paper aimed to develop a measurement system for the pH distribution on a metal surface in simulated atmospheric envi -ronment. The surface pH distribution was measured with agar film including pH indicators and MgCl 2 . The pH indicators used were a universal indicator and an MR ︲ BTB indicator. Agar film of 0 . 5 mm thickness was placed on an iron specimen. The specimen was set in a chamber with a relative humidity of 100 ％ to prevent the agar film from drying out. The surface pH distribution was deter - mined from the color of the agar film with an RGB color model. The surface pH distribution on the iron showed that anodic reac tions produced acidic regions and cathodic reactions produced basic regions. The observed phenomena were the same as that found under a water droplet which contained the pH indicator and MgCl 2 . Therefore, we conclude that the agar film could simulate thin water film in an atmospheric environment and allow measurement of the surface pH distribution on iron under corro sion.","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"14 1","pages":"495-501"},"PeriodicalIF":0.0,"publicationDate":"2017-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87392563","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 : 2017-09-01DOI: 10.2320/JINSTMET.JB201702
Y. Sato, K. Kawabe, K. Sugawara, M. Hara
{"title":"High Temperature Corrosion of Ni-5, -8 and -10 at%Al Alloys in Air with a Trace Amount of NaCl Vapor","authors":"Y. Sato, K. Kawabe, K. Sugawara, M. Hara","doi":"10.2320/JINSTMET.JB201702","DOIUrl":"https://doi.org/10.2320/JINSTMET.JB201702","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"42 1","pages":"441-446"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82518027","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 : 2017-07-01DOI: 10.2320/JINSTMET.J2017011
Masataka Ijiri, Yukihito Tomita, Takafumi Ishikawa, K. Kadowaki, Y. Takemoto
{"title":"Ti-xNb-7Alの焼戻しに伴うβ→α″変態に及ぼすNb添加量の影響","authors":"Masataka Ijiri, Yukihito Tomita, Takafumi Ishikawa, K. Kadowaki, Y. Takemoto","doi":"10.2320/JINSTMET.J2017011","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2017011","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"20 1","pages":"345-351"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79701499","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 : 2017-05-12DOI: 10.2320/JINSTMET.J2016069
M. Takano, Keiji Kuroda, Kohei Hase, Shuuto Tanaka, S. Yamasaki, M. Mitsuhara, H. Nakashima
In recent years, it has become necessary to develop lead substitutes, such as lead–free solder alloys, because of increased environmental concerns regarding the use of leaded materials. In addition, electronic components that use lead–free solder alloys will need to be smaller and usable at higher operating temperatures in next–generation semiconductor devices. Therefore, lead–free solder alloys must be made more reliable. In this work, tin–copper–nickel (Sn–Cu–Ni) solder alloys, Sn–Cu solder alloys, and Sn–Ni solder alloys, as well as 99.96 mass% pure Sn, were subjected to tensile testing. The results showed the effects of adding Cu and Ni to Sn on the high–temperature deformation behavior of the Sn–Cu–Ni solder alloys. For each alloy and Sn, the stress exponent was estimated to be >5. This result indicated that, in each sample, the high–temperature deformation was controlled by dislocation creep. Furthermore, the creep activation energy was dependent on stress, and was affected to the greatest extent when adding Cu. [doi:10.2320/jinstmet.J2016069]
近年来，由于使用含铅材料引起的环境问题日益严重，有必要开发铅替代品，例如无铅焊料合金。此外，在下一代半导体器件中，使用无铅焊料合金的电子元件需要更小，并能在更高的工作温度下使用。因此，必须使无铅焊料合金更加可靠。本文对锡-铜-镍(Sn - cu - ni)钎料合金、Sn - cu钎料合金和Sn - ni钎料合金以及99.96质量%纯锡进行了拉伸试验。结果表明，在Sn中加入Cu和Ni对Sn - Cu - Ni钎料合金的高温变形行为有影响。各合金和Sn的应力指数均大于5。结果表明，各试样的高温变形均受位错蠕变控制。蠕变活化能与应力有关，其中Cu对蠕变活化能的影响最大。(doi: 10.2320 / jinstmet.J2016069)
{"title":"Effect of Cu and Ni addition on high temperature deformation behavior in Sn-Cu-Ni solder alloys","authors":"M. Takano, Keiji Kuroda, Kohei Hase, Shuuto Tanaka, S. Yamasaki, M. Mitsuhara, H. Nakashima","doi":"10.2320/JINSTMET.J2016069","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016069","url":null,"abstract":"In recent years, it has become necessary to develop lead substitutes, such as lead–free solder alloys, because of increased environmental concerns regarding the use of leaded materials. In addition, electronic components that use lead–free solder alloys will need to be smaller and usable at higher operating temperatures in next–generation semiconductor devices. Therefore, lead–free solder alloys must be made more reliable. In this work, tin–copper–nickel (Sn–Cu–Ni) solder alloys, Sn–Cu solder alloys, and Sn–Ni solder alloys, as well as 99.96 mass% pure Sn, were subjected to tensile testing. The results showed the effects of adding Cu and Ni to Sn on the high–temperature deformation behavior of the Sn–Cu–Ni solder alloys. For each alloy and Sn, the stress exponent was estimated to be >5. This result indicated that, in each sample, the high–temperature deformation was controlled by dislocation creep. Furthermore, the creep activation energy was dependent on stress, and was affected to the greatest extent when adding Cu. [doi:10.2320/jinstmet.J2016069]","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"37 1","pages":"337-344"},"PeriodicalIF":0.0,"publicationDate":"2017-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76151326","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 : 2017-04-14DOI: 10.2320/JINSTMET.J2016051
Shigetaka Imabayashi, M. Ishimaru
The structural relaxation of amorphous germanium was examined by molecular dynamics simulations based on the empirical Tersoff interatomic potential. Although the Tersoff potential overestimated both the melting and glass transition temperatures, it was able to reproduce the structural relaxation behavior. The potential energy decreases with thermal annealing below the glass transition temperature, but occasionally increases during structural relaxation. The mean square displacement of atoms also increases in these periods. These changes were attributed to cooperative atomic motion during the structural relaxation. Atomic trajectories revealed that structural changes are induced by spatiallyand temporally-inhomogeneous atomic motions: atomically mobile and immobile regions coexist during structural relaxation. [doi:10.2320/matertrans.M2017036]
{"title":"Molecular Dynamics Study on Structural Relaxation Processes in Amorphous Germanium","authors":"Shigetaka Imabayashi, M. Ishimaru","doi":"10.2320/JINSTMET.J2016051","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016051","url":null,"abstract":"The structural relaxation of amorphous germanium was examined by molecular dynamics simulations based on the empirical Tersoff interatomic potential. Although the Tersoff potential overestimated both the melting and glass transition temperatures, it was able to reproduce the structural relaxation behavior. The potential energy decreases with thermal annealing below the glass transition temperature, but occasionally increases during structural relaxation. The mean square displacement of atoms also increases in these periods. These changes were attributed to cooperative atomic motion during the structural relaxation. Atomic trajectories revealed that structural changes are induced by spatiallyand temporally-inhomogeneous atomic motions: atomically mobile and immobile regions coexist during structural relaxation. [doi:10.2320/matertrans.M2017036]","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"52 1","pages":"66-70"},"PeriodicalIF":0.0,"publicationDate":"2017-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83673567","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 : 2017-04-07DOI: 10.2320/JINSTMET.JBW201605
Shogo Takesue, S. Kikuchi, H. Akebono, J. Komotori, Kengo Fukazawa, Yoshitaka Misaka
{"title":"ガスブローIH窒化を施したTi-6Al-4V合金の表面特性に及ぼすガス流速の影響","authors":"Shogo Takesue, S. Kikuchi, H. Akebono, J. Komotori, Kengo Fukazawa, Yoshitaka Misaka","doi":"10.2320/JINSTMET.JBW201605","DOIUrl":"https://doi.org/10.2320/JINSTMET.JBW201605","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"36 1","pages":"288-293"},"PeriodicalIF":0.0,"publicationDate":"2017-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73988415","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 : 2017-04-01DOI: 10.2320/JINSTMET.JPR2017901
Yu-ki Taninouchi, T. Okabe
{"title":"Frontier of recycling technology for precious metals","authors":"Yu-ki Taninouchi, T. Okabe","doi":"10.2320/JINSTMET.JPR2017901","DOIUrl":"https://doi.org/10.2320/JINSTMET.JPR2017901","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"9 1","pages":"151-151"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80737323","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 : 2017-04-01DOI: 10.2320/JINSTMET.J2015062
Kazutaka Fukuda, Y. Koyanagi, M. Tsushida, H. Kitahara, T. Mayama, S. Ando
1Graduate School of Science and Technology, Kumamoto University, Kumamoto 8608555 2Department of Materials Science and Engineering, Faculty of Engineering, Kumamoto University, Kumamoto 8608555 3Faculty of Engineering, Kumamoto University, Kumamoto 8608555 4Institute of Pulsed Power Science, Kumamoto University, Kumamoto 8608555 5Priority Organization for Innovation and Excellence, Kumamoto University, Kumamoto 8608555 6Magnesium Research Center, Kumamoto University, Kumamoto 8608555
{"title":"Activation stress for slip systems of pure magnesium single crystals in pure shear test","authors":"Kazutaka Fukuda, Y. Koyanagi, M. Tsushida, H. Kitahara, T. Mayama, S. Ando","doi":"10.2320/JINSTMET.J2015062","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2015062","url":null,"abstract":"1Graduate School of Science and Technology, Kumamoto University, Kumamoto 8608555 2Department of Materials Science and Engineering, Faculty of Engineering, Kumamoto University, Kumamoto 8608555 3Faculty of Engineering, Kumamoto University, Kumamoto 8608555 4Institute of Pulsed Power Science, Kumamoto University, Kumamoto 8608555 5Priority Organization for Innovation and Excellence, Kumamoto University, Kumamoto 8608555 6Magnesium Research Center, Kumamoto University, Kumamoto 8608555","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"72 1","pages":"334-339"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78189993","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 : 2017-03-31DOI: 10.2320/JINSTMET.JBW201612
悠 竹内, 小川 由希子, 大輔 安藤, 祐司 須藤, 淳一 小池
{"title":"高Sc濃度を有するMg-Sc-Zn系合金の引張変形挙動に及ぼす初期組織の影響","authors":"悠 竹内, 小川 由希子, 大輔 安藤, 祐司 須藤, 淳一 小池","doi":"10.2320/JINSTMET.JBW201612","DOIUrl":"https://doi.org/10.2320/JINSTMET.JBW201612","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"226 ","pages":"276-281"},"PeriodicalIF":0.0,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72554870","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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