Pub Date : 2017-01-01DOI: 10.2320/JINSTMET.J2016052
I. Goto, S. Aso, K. Ohguchi, Hayato Oguri, K. Kurosawa, Hiroyuki Y. Suzuki, H. Hayashi, J. Shionoya
The factors influencing the tensile deformation behavior and the electrical conductivity of pure copper castings fabricated by an industrial process were investigated. The pure copper castings had sufficient deformation characteristics and electrical conductiv ity on the practical side. However, the deformation characteristics and the electrical conductivity of the castings were slightly inferior to those of the castings fabricated by laboratory experiments. The oxygen content in the castings fabricated by the industrial process was less than 0 . 01 mass ％ , which resulted in the absence of Cu ︲ Cu 2 O eutectic phase that exhibits the brittle behavior. On the other hand, observations of the fracture surface and the cross ︲ section of the castings showed the existences of microporosity and two types of inclusions. These may be the factors influencing the decrease in the both tensile strength and uniform elongation. The microporosity were suggested to be caused by higher hydrogen content in the melt and / or by slower cooling rate during solidifica -tion. EDX analyses suggested that the inclusions are a kind of slag and straw ashes. Furthermore, phosphorus and iron content in the castings fabricated by the industrial process were higher than those in the castings fabricated by the laboratory experiments. These may be the factors influencing the decrease in electrical conductivity. The above findings indicated the several methods to improve the properties of the castings fabricated by the industrial process. ［ doi:10 . 2320 / jinstmet.J2016052 ］
{"title":"Factors Influencing Deformation Behavior and Electrical Conductivity of Pure Copper Castings Fabricated by Industrial Process","authors":"I. Goto, S. Aso, K. Ohguchi, Hayato Oguri, K. Kurosawa, Hiroyuki Y. Suzuki, H. Hayashi, J. Shionoya","doi":"10.2320/JINSTMET.J2016052","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016052","url":null,"abstract":"The factors influencing the tensile deformation behavior and the electrical conductivity of pure copper castings fabricated by an industrial process were investigated. The pure copper castings had sufficient deformation characteristics and electrical conductiv ity on the practical side. However, the deformation characteristics and the electrical conductivity of the castings were slightly inferior to those of the castings fabricated by laboratory experiments. The oxygen content in the castings fabricated by the industrial process was less than 0 . 01 mass ％ , which resulted in the absence of Cu ︲ Cu 2 O eutectic phase that exhibits the brittle behavior. On the other hand, observations of the fracture surface and the cross ︲ section of the castings showed the existences of microporosity and two types of inclusions. These may be the factors influencing the decrease in the both tensile strength and uniform elongation. The microporosity were suggested to be caused by higher hydrogen content in the melt and / or by slower cooling rate during solidifica -tion. EDX analyses suggested that the inclusions are a kind of slag and straw ashes. Furthermore, phosphorus and iron content in the castings fabricated by the industrial process were higher than those in the castings fabricated by the laboratory experiments. These may be the factors influencing the decrease in electrical conductivity. The above findings indicated the several methods to improve the properties of the castings fabricated by the industrial process. ［ doi:10 . 2320 / jinstmet.J2016052 ］","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"9 1","pages":"133-142"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75942944","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 : 2017-01-01DOI: 10.2320/JINSTMET.J2016059
Y. Chino, Xinsheng Huang, Kazutaka Suzuki
Magnesium (Mg) alloys are suitable materials for weight reduction in vehicles because of their low densities and high specific strengths. However, rolled Mg alloy sheets generally exhibit a poor formability at room temperature and thus their applications are restricted. This poor formability is originated from basal slip dominated deformation as well as strong basal texture. It is known that the formability can be improved by suppression of basal texture formation. Thus, large efforts have been devoted to texture control for the purpose of enhancing the room temperature formability. In this paper, recent researches for texture control of rolled Mg alloy sheets are reviewed. [doi:10.2320/jinstmet.J2016059]
{"title":"Development of Room Temperature Formability of Rolled Magnesium Alloy Sheets by Texture Control","authors":"Y. Chino, Xinsheng Huang, Kazutaka Suzuki","doi":"10.2320/JINSTMET.J2016059","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016059","url":null,"abstract":"Magnesium (Mg) alloys are suitable materials for weight reduction in vehicles because of their low densities and high specific strengths. However, rolled Mg alloy sheets generally exhibit a poor formability at room temperature and thus their applications are restricted. This poor formability is originated from basal slip dominated deformation as well as strong basal texture. It is known that the formability can be improved by suppression of basal texture formation. Thus, large efforts have been devoted to texture control for the purpose of enhancing the room temperature formability. In this paper, recent researches for texture control of rolled Mg alloy sheets are reviewed. [doi:10.2320/jinstmet.J2016059]","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"65 1","pages":"49-54"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90167771","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 : 2017-01-01DOI: 10.2320/JINSTMET.J2016048
R. Yoshimura, H. Esaka, K. Shinozuka
{"title":"Influence of Zn Addition on the Solid/Liquid Interfacial Energy in Sn-Ag Alloy","authors":"R. Yoshimura, H. Esaka, K. Shinozuka","doi":"10.2320/JINSTMET.J2016048","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016048","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"6 1","pages":"264-269"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88463279","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 : 2017-01-01DOI: 10.2320/JINSTMET.J2016053
Masaya Kumagai, K. Kurosaki, Y. Ohishi, H. Muta, S. Yamanaka
Thermoelectric （ TE ） power generation can directly convert waste heat into electric energy. However, one of the bottlenecks for widespread use of TE power generation is toxicity of currently ︲ used TE materials. We focused on Al ︲ based materials as candidate of low ︲ toxicity TE materials. Although Al ︲ based materials have high power factor, the achievement of high TE performance is dif - ficult because of the high lattice thermal conductivity. The aims of the present study are to synthesize Al 5 Co 2 known as a pseudogap intermetallic compound, and to investigate the TE properties. We found that lattice thermal conductivity κ lat of Al 5 Co 2 is lower than those of other Al based TE materials, such as Fe 2 VAl, Al 2 Ru and Al 3 V. The κ lat of Al 5 Co 2 at room temperature was 7 . 1 Wm ︲ 1 K ︲ 1 . We also found that Fe substitution at Co sites enhances power factor （ PF ） . The maximum PF was ～ 0 . 6 mWm ︲ 1 K ︲ 2 at room temperature for Al 5 （ Co 0 . 95 Fe 0 . 05 ） 2 . ［ doi:10 . 2320 / jinstmet.J2016053 ］ （ 2016 ）
{"title":"Electronic Structure and Thermoelectric Properties of Pseudogap Intermetallic Compound Al 5 Co 2","authors":"Masaya Kumagai, K. Kurosaki, Y. Ohishi, H. Muta, S. Yamanaka","doi":"10.2320/JINSTMET.J2016053","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016053","url":null,"abstract":"Thermoelectric （ TE ） power generation can directly convert waste heat into electric energy. However, one of the bottlenecks for widespread use of TE power generation is toxicity of currently ︲ used TE materials. We focused on Al ︲ based materials as candidate of low ︲ toxicity TE materials. Although Al ︲ based materials have high power factor, the achievement of high TE performance is dif - ficult because of the high lattice thermal conductivity. The aims of the present study are to synthesize Al 5 Co 2 known as a pseudogap intermetallic compound, and to investigate the TE properties. We found that lattice thermal conductivity κ lat of Al 5 Co 2 is lower than those of other Al based TE materials, such as Fe 2 VAl, Al 2 Ru and Al 3 V. The κ lat of Al 5 Co 2 at room temperature was 7 . 1 Wm ︲ 1 K ︲ 1 . We also found that Fe substitution at Co sites enhances power factor （ PF ） . The maximum PF was ～ 0 . 6 mWm ︲ 1 K ︲ 2 at room temperature for Al 5 （ Co 0 . 95 Fe 0 . 05 ） 2 . ［ doi:10 . 2320 / jinstmet.J2016053 ］ （ 2016 ）","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"94 1","pages":"55-59"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83889227","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 : 2017-01-01DOI: 10.2320/JINSTMET.J2016065
Hiroshi Kobayashi, Hirofumi Shoji, S. Asano, Masaki Imamura
The matte chlorine leach and electro ︲ winning （ MCLE ） process, developed by Sumitomo Metal Mining Co., Ltd. （ SMM ） is well known as a unique commercial nickel refining process with a high nickel recovery ratio. SMM has gradually increased the ratio of mixed sulfide （ MS: mixture of nickel and cobalt sulfides ） that can be used as a raw material in the MCLE process over the past decade. However, the reactivity of MS in chlorine leaching remains insufficient and further improvements are needed. We performed bench scale chlorine leaching tests with iron chloride, instead of the currently used copper chloride, as an oxi - dant medium for chlorine gas. However the reactivity of MS was not improved despite the higher oxidation ︲ reduction potential （ ORP ） of iron chloride than that of copper chloride. Though stability studies of iron chloride complexes based on an E ︲ pCl （ poten - tial, ︲ log a Cl ︲ ） diagram, the chlorine leaching potential that is suitable for copper chloride was found to be too low for iron chloride. Reactivity of MS was improved at a higher leaching potentials; however this did not represent a significant improvement over copper chloride based methods. We elucidated the reaction mechanism and showed that chlorine leaching with iron chloride is not suitable for industrial application to MS. ［ doi:10 . 2320 / jinstmet.J2016065 ］
由住友金属矿业株式会社(SMM)开发的磨砂氯浸电︲浸出(MCLE)工艺是一种独特的商业镍精炼工艺，具有很高的镍回收率。在过去的十年中，SMM逐渐增加了混合硫化物(MS:镍和钴硫化物的混合物)在MCLE工艺中用作原料的比例。然而，MS在氯浸出中的反应性仍然不足，需要进一步改进。我们用氯化铁代替目前使用的氯化铜作为氯气的氧化介质，进行了实验规模的氯浸出试验。尽管氯化铁的氧化还原电位︲(ORP)高于氯化铜，但MS的反应活性并未得到改善。虽然基于E︲pCl(电位，︲log a Cl︲)图对氯化铁络合物的稳定性进行了研究，但发现适合氯化铜的氯浸出电位对于氯化铁来说太低了。在较高的浸出电位下，质谱的反应性得到改善;然而，这并不代表比基于氯化铜的方法有显著的改进。我们阐明了反应机理，并表明用氯化铁进行氯浸不适合用于ms的工业应用[doi:10]。2320 / jinstmet。J2016065]
{"title":"Chlorine Leaching of Nickel and Cobalt Mixed Sulfide using Iron Chloride Solution","authors":"Hiroshi Kobayashi, Hirofumi Shoji, S. Asano, Masaki Imamura","doi":"10.2320/JINSTMET.J2016065","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016065","url":null,"abstract":"The matte chlorine leach and electro ︲ winning （ MCLE ） process, developed by Sumitomo Metal Mining Co., Ltd. （ SMM ） is well known as a unique commercial nickel refining process with a high nickel recovery ratio. SMM has gradually increased the ratio of mixed sulfide （ MS: mixture of nickel and cobalt sulfides ） that can be used as a raw material in the MCLE process over the past decade. However, the reactivity of MS in chlorine leaching remains insufficient and further improvements are needed. We performed bench scale chlorine leaching tests with iron chloride, instead of the currently used copper chloride, as an oxi - dant medium for chlorine gas. However the reactivity of MS was not improved despite the higher oxidation ︲ reduction potential （ ORP ） of iron chloride than that of copper chloride. Though stability studies of iron chloride complexes based on an E ︲ pCl （ poten - tial, ︲ log a Cl ︲ ） diagram, the chlorine leaching potential that is suitable for copper chloride was found to be too low for iron chloride. Reactivity of MS was improved at a higher leaching potentials; however this did not represent a significant improvement over copper chloride based methods. We elucidated the reaction mechanism and showed that chlorine leaching with iron chloride is not suitable for industrial application to MS. ［ doi:10 . 2320 / jinstmet.J2016065 ］","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"73 1","pages":"282-287"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86016079","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 : 2017-01-01DOI: 10.2320/JINSTMET.JA201602
忠勝 大久保, H. Sepehri-Amin, 和博 宝野
{"title":"マイクロマグネティクス計算によるNd-Fe-B磁石磁化反転過程の解析","authors":"忠勝 大久保, H. Sepehri-Amin, 和博 宝野","doi":"10.2320/JINSTMET.JA201602","DOIUrl":"https://doi.org/10.2320/JINSTMET.JA201602","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"13 1","pages":"11-18"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75105715","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 : 2017-01-01DOI: 10.2320/jinstmet.j2016049
Y. Shimogami, T. Oyama, C. Watanabe, R. Monzen
The growth process of ω ︲ precipitates was studied for a Ti ︲ 20 mass ％ Mo alloy aged at 673 K. Investigations of the aging time t dependences of precipitate size, precipitate volume fraction, and precipitate number density revealed that the growth process was divided into three stages: the first stage of diffusion ︲ controlled growth, the second mixed stage of growth and coarsening, and the third stage of coarsening. In the first stage, the precipitate size d increased as d 2 ∝ t with increasing t , and then the precipitate growth became very slow after a value of d =14 nm was reached at the beginning of the second mixed stage. This is ascribed to the transi - tion from the growth stage to the mixed stage of growth and coarsening, and the collision of neighboring ω ︲ precipitates. After the neighboring ω ︲ precipitates of the same variant collided and then coalesced, the precipitate size increased as d 3 ∝ t with increasing t in the mixed stage and the coarsening stage. ［ doi:10 . 2320 / jinstmet.J2016049 ］
{"title":"Growth Process of ω-precipitates in a Ti-20 mass% Mo Alloy","authors":"Y. Shimogami, T. Oyama, C. Watanabe, R. Monzen","doi":"10.2320/jinstmet.j2016049","DOIUrl":"https://doi.org/10.2320/jinstmet.j2016049","url":null,"abstract":"The growth process of ω ︲ precipitates was studied for a Ti ︲ 20 mass ％ Mo alloy aged at 673 K. Investigations of the aging time t dependences of precipitate size, precipitate volume fraction, and precipitate number density revealed that the growth process was divided into three stages: the first stage of diffusion ︲ controlled growth, the second mixed stage of growth and coarsening, and the third stage of coarsening. In the first stage, the precipitate size d increased as d 2 ∝ t with increasing t , and then the precipitate growth became very slow after a value of d =14 nm was reached at the beginning of the second mixed stage. This is ascribed to the transi - tion from the growth stage to the mixed stage of growth and coarsening, and the collision of neighboring ω ︲ precipitates. After the neighboring ω ︲ precipitates of the same variant collided and then coalesced, the precipitate size increased as d 3 ∝ t with increasing t in the mixed stage and the coarsening stage. ［ doi:10 . 2320 / jinstmet.J2016049 ］","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"5 1","pages":"97-100"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75120806","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 : 2017-01-01DOI: 10.2320/JINSTMET.J2016050
F. Kirino, Naoshi Ohono, Satoko Taguchi, Akimitsu Nezu, R. Yokoyama
Metal craft production techniques for coin ︲ type medal rewarding contributions manufactured in the Momoyama ︲ era were studied. Reward samples are separated into two types on the basis of production process. One process is casting, and the other is forging. An example of the composition of a casting sample is Ag ︲ Cu alloy, and that of a forged sample is pure Ag. Many voids in cast cultural properties, called eirakutsuho , are observed using X ︲ ray transmission imaging techniques, and indicate the production technique used during this era. Inner stress is measured by the sin 2 ψ method for identifying X ︲ ray diffraction pattern changes. The inner stress of eirakutsuho manufactured by casting is compressive. This is a solidification contraction that occurs at the time of casting. The metal morphology of cast cultural properties, such as eirakutsuho is of the branch type. A thermal flaw is manufactured at the surface of such a cultural property. A creased metal morphology is formed in production by the forging method. Eirakutsuho manufactured by the forging method is stress free. This result indicates that thermal treatment is used in this manufacture process. pure Ag is easy to process for forging. Test samples of cultural properties have been found to have been manufactured by forging methods. It is assumed that the jyotagane metal craft technique was used. The inner stress manufactured in this sample prepared by this method is compressive. After annealing, this sample becomes stress free. The result matches the results obtained by mea - suring the inner stress of cultural properties. ［ doi:10 . 2320 / jinstmet.J2016050 ］ （ Received 5, 20, 2017 ）
{"title":"Production techniques of coin-type medal rewarding contributions manufacturing in the Momoyama -era","authors":"F. Kirino, Naoshi Ohono, Satoko Taguchi, Akimitsu Nezu, R. Yokoyama","doi":"10.2320/JINSTMET.J2016050","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016050","url":null,"abstract":"Metal craft production techniques for coin ︲ type medal rewarding contributions manufactured in the Momoyama ︲ era were studied. Reward samples are separated into two types on the basis of production process. One process is casting, and the other is forging. An example of the composition of a casting sample is Ag ︲ Cu alloy, and that of a forged sample is pure Ag. Many voids in cast cultural properties, called eirakutsuho , are observed using X ︲ ray transmission imaging techniques, and indicate the production technique used during this era. Inner stress is measured by the sin 2 ψ method for identifying X ︲ ray diffraction pattern changes. The inner stress of eirakutsuho manufactured by casting is compressive. This is a solidification contraction that occurs at the time of casting. The metal morphology of cast cultural properties, such as eirakutsuho is of the branch type. A thermal flaw is manufactured at the surface of such a cultural property. A creased metal morphology is formed in production by the forging method. Eirakutsuho manufactured by the forging method is stress free. This result indicates that thermal treatment is used in this manufacture process. pure Ag is easy to process for forging. Test samples of cultural properties have been found to have been manufactured by forging methods. It is assumed that the jyotagane metal craft technique was used. The inner stress manufactured in this sample prepared by this method is compressive. After annealing, this sample becomes stress free. The result matches the results obtained by mea - suring the inner stress of cultural properties. ［ doi:10 . 2320 / jinstmet.J2016050 ］ （ Received 5, 20, 2017 ）","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"36 1","pages":"101-108"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84651346","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 : 2017-01-01DOI: 10.2320/JINSTMET.JA201604
T. Yoshioka, H. Tsuchiura
Recently, several experimental studies for sintered Nd-Fe-B magnets have shown that their coercivity can be decisively affected by atomic structures around the grain boundaries in the magnets. In this article, a theoretical review is given on possible coercivity reduction mechanisms in sintered Nd-Fe-B or rare-earth based permanent magnets by focusing on the anomalous local magnetic anisotropy found for Nd ions on interfacial structures, based on first-principles calculations and an effective spin model. [doi:10.2320/jinstmet.JA201604]
近年来，对Nd-Fe-B烧结磁体的实验研究表明，磁体晶界周围的原子结构对其矫顽力有决定性的影响。本文基于第一性原理计算和有效自旋模型，对烧结Nd- fe - b或稀土基永磁体中可能的矫顽力降低机制进行了理论综述，重点关注了Nd离子在界面结构上发现的异常局域磁各向异性。(doi: 10.2320 / jinstmet.JA201604)
{"title":"Magnetic Anisotropy Around Grain-Boundaries in Rare-Earth Magnets and Their Coercivity","authors":"T. Yoshioka, H. Tsuchiura","doi":"10.2320/JINSTMET.JA201604","DOIUrl":"https://doi.org/10.2320/JINSTMET.JA201604","url":null,"abstract":"Recently, several experimental studies for sintered Nd-Fe-B magnets have shown that their coercivity can be decisively affected by atomic structures around the grain boundaries in the magnets. In this article, a theoretical review is given on possible coercivity reduction mechanisms in sintered Nd-Fe-B or rare-earth based permanent magnets by focusing on the anomalous local magnetic anisotropy found for Nd ions on interfacial structures, based on first-principles calculations and an effective spin model. [doi:10.2320/jinstmet.JA201604]","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"128 ","pages":"19-25"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72439168","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 : 2017-01-01DOI: 10.2320/JINSTMET.J2016063
S. Saito, Shogo Takesue, J. Komotori, Kengo Fukazawa, Y. Misaka
{"title":"Formation of a TiAl 3 Layer by an AIH-FPP Treatment Using Mechanically Milled Particles and Its Wear Resistance","authors":"S. Saito, Shogo Takesue, J. Komotori, Kengo Fukazawa, Y. Misaka","doi":"10.2320/JINSTMET.J2016063","DOIUrl":"https://doi.org/10.2320/JINSTMET.J2016063","url":null,"abstract":"","PeriodicalId":17337,"journal":{"name":"Journal of The Japan Institute of Metals","volume":"26 1","pages":"295-300"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79060726","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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