Materials Science and Engineering最新文献_第9页

Microstructure studies in Nd2(Fe0.9Co0.1)14B thin films Nd2(Fe0.9Co0.1)14B薄膜的微观结构研究

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90312-6

J. Strzeszewski , A. Nazareth, G.C. Hadjipanayis, K. Aylesworth, Z.R. Zhao, D.J. Sellmyer

引用次数: 4

The comparative performance of Nd(Fe, Co)B magnets formed by rapid quenching and by sintering 快速淬火与烧结制备Nd(Fe, Co)B磁体的性能比较

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90306-0

Wang Zhenxi, Yu Boliang, Wang Yizhong, Huang Jiao Hong, Yin Lin, Feng Minying

引用次数: 5

Preparation and electrical properties of aluminium-based ternary and quaternary quasi-crystals 铝基三元和四元准晶体的制备及其电学性能

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90372-2

K. Kimura, H. Yamane, T. Hashimoto, S. Takeuchi

{"title":"Preparation and electrical properties of aluminium-based ternary and quaternary quasi-crystals","authors":"K. Kimura, H. Yamane, T. Hashimoto, S. Takeuchi","doi":"10.1016/0025-5416(88)90372-2","DOIUrl":"10.1016/0025-5416(88)90372-2","url":null,"abstract":"<div>An addition of a small amount of silicon, ruthenium, molybdenum or niobium to AlMn and AlV alloy systems (manganese has a magnetic moment while vanadium has not) causes a decrease in the amount of second phase, sharpening of the X-ray diffraction peaks and an increase in the crystallization temperature. The electrical resistivities of the quasi-crystalline AlMn alloys are 800–1000 μΩ cm and have negative temperature coefficients from 1 K to room temperature. Such high resistivities must be due to an extremely short mean free path of the electrons. In the low temperature region (less than 50 K), the resistivity π of the quasi-crystalline AlMn alloys increases rapidly with decreasing temperature T. The resistivity is proportional to −log T or T−a on the higher temperature side of this region and to −T1/2 on the lower side. In contrast, π for the quasicrystalline Al-V alloys is 200–400 μΩ cm and is nearly constant from 1 k to 77 K. The behaviour of the resistivity for quasi-crystalline Al-Mn and Al-V alloys cannot be simply interpreted by ordinary mechanisms. Attempts have been made to interpret the behaviour by tunnelling and variable-range hopping conduction in the critical but not extended or localized states which are considered to be the characteristic electronic states in quasi-crystals.</div>","PeriodicalId":100890,"journal":{"name":"Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0025-5416(88)90372-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75057938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

An electron-microscopic investigation of the transformation behaviour of Al6Mg4Cu quasi-crystalline alloy Al6Mg4Cu准晶合金相变行为的电镜研究

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90363-1

V.Venkateswara Rao , T.R. Anantharaman

引用次数: 9

Electron transport in co-evaporated thin film and melt-spun ribbon Al1−xMnx alloys 共蒸发薄膜和熔纺带状Al1−xMnx合金中的电子输运

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90326-6

V. Nguyen Van, S. Fisson, K. Yu-Zhang, M. Harmelin

引用次数: 1

On many-electron effects and multiplet splittings in X-ray photoelectron spectroscopy as a diagnostic tool for metallic glasses 作为金属玻璃诊断工具的x射线光电子能谱中的多电子效应和多重分裂

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90335-7

Z.M. Stadnik , J.F. Van Acker, J.C. Fuggle, H.J.W.M. Hoekstra, K.H.J. Buschow, T. Miyazaki, G. Stroink

引用次数: 1

Pair distribution function in icosahedral AlMnSi alloy 二十面体AlMnSi合金中的对分布函数

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90370-9

S. Nanao, Y. Tanaka, Y. Sakurai, C. Kokubu, Y. Watanabe, M. Masuda, I. Yasui

引用次数: 11

Quasicrystals and quasicrystal-related phases in the AlMn system AlMn体系中的准晶及准晶相关相

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90351-5

L.A. Bendersky

{"title":"Quasicrystals and quasicrystal-related phases in the AlMn system","authors":"L.A. Bendersky","doi":"10.1016/0025-5416(88)90351-5","DOIUrl":"10.1016/0025-5416(88)90351-5","url":null,"abstract":"<div>The AlMn system is very rich in phases with composition close to Al4Mn. As solidification conditions change from very slow (casting) to extremely fast (atomized submicron-size droplets) the following phases will form: hexagonal μ phase (a = 1.995nm; c = 2.452nm), hexagonal λ phase (a = 2.841 nm; c = 1.238 nm), decagonal quasicrystal, icosahedral quasicrystal and microquasicrystalline or “amorphous” phase. In the present work, the potential interrelationship between the structures of the crystalline, quasicrystalline and amorphous Al4Mn phases is investigated by a systematic study of electron diffraction intensities. Analysis of electron diffraction intensity modulations and their spatial relationships suggests that the phases have a structural skeleton of icosahedral units, possibly of the Mackay icosahedron type. Different crystalline and quasi-periodic phases can be formed by different stackings of the same icosahedral clusters and they are not necessarily in a single orientation. The amorphous structure can be described as a network of the randomly oriented clusters.</div>","PeriodicalId":100890,"journal":{"name":"Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1988-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0025-5416(88)90351-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80181511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

High resolution solid state nuclear magnetic resonance study of the electronic structure of rapidly quenched alloys 快速淬火合金电子结构的高分辨率固态核磁共振研究

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90345-X

I. Furó, I. Bakonyi, K. Tompa, A. Lovas, I. Heinmaa, M. Alla, E. Lippmaa, H.E. Schone

引用次数: 6

Electronic structure of amorphous transition metal alloys 非晶过渡金属合金的电子结构

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90332-1

Françoise Cyrot-Lackmann, Didier Mayou, Duc Nguyen Manh

引用次数: 11