Materials Science and Engineering最新文献_第6页

Preparation and structural investigation by X-ray and neutron scattering of quasi-crystalline and glassy Pd58.8Si20.6U20.6 准晶和玻璃态Pd58.8Si20.6U20.6的制备及x射线和中子散射研究

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90371-0

R. Fuchs, S. Jost, H. Rudin, H.-J. Güntherodt, P. Fischer

引用次数: 0

Crystallite size determinations for melt-spun FeNdB permanent magnet alloys 熔体纺铁NdB永磁合金的晶粒尺寸测定

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90311-4

G.E. Carr, H.A. Davies, R.A. Buckley

引用次数: 41

Metastable phase boundaries of quasicrystalline phases 准晶相的亚稳相边界

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90359-X

D.M. Follstaedt, J.A. Knapp

引用次数: 10

Growth of quasi-crystals 准晶体的生长

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90374-6

S.R. Nishitani, K.N. Ishihara, K.F. Kobayashi, P.H. Shingu

引用次数: 5

Magnetic behaviour in amorphous TbxCu1−x alloys (x = 0.18, 0.22, 0.33, 0.50 and 0.65) 非晶TbxCu1−x合金(x = 0.18, 0.22, 0.33, 0.50和0.65)的磁性行为

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90314-X

B. Boucher, M. Sanquer, R. Tourbot, P. Chieux, P. Convert, M. Maret, J. Bigot

{"title":"Magnetic behaviour in amorphous TbxCu1−x alloys (x = 0.18, 0.22, 0.33, 0.50 and 0.65)","authors":"B. Boucher, M. Sanquer, R. Tourbot, P. Chieux, P. Convert, M. Maret, J. Bigot","doi":"10.1016/0025-5416(88)90314-X","DOIUrl":"10.1016/0025-5416(88)90314-X","url":null,"abstract":"<div>The results of susceptibility, magnetization and small-angle neutron scattering measurement for 4 K < T < 300 K are discussed. In all cases the magnetization is distributed in an inhomogeneous way either inside isolated bubbles or within the interbubble spaces. The terbium-poor alloys present a usual hysteresis loop contrary to the terbium-rich alloys for which the applied field plays an important role in establishing the moment order. The order established in a high field (H ≈ 3.6 × 106 A m−1) is preserved when this field decreases or is reversed. Polishing increases the volume of the magnetic domains within the sample and orients the moments at the surface perpendicular to the polishing direction.The magnetic susceptibility in a 1.6 × 105 A m−1 field and the isothermal magnetization (H ⩽ 3.6 × 106 A m−1) for each alloy have been measured for 4 K < T < 300 K; the magnetic properties are discussed in terms of the nuclear and magnetic medium-range order as determined by small-angle neutron scattering; the measurements were done at the Institut Laue Langevin, with the D 11 spectrometer. The samples were prepared by sputtering and also, for x = 0.65, by planar flow casting. In both cases the samples are in the form of sheets 40 μm thick and 1 cm wide. For sample x = 0.65 (planar flow casting), both faces were polished with fine sandpaper along a chosen direction and then measured.</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)90314-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81334617","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: 7

The discovery of quasicrystals through rapid quenching of metallic alloys 通过快速淬火金属合金发现准晶

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90349-7

John W. Cahn

引用次数: 1

Magnetic and thermal properties of (NdxFe1−x)82.5B17.5 glasses (NdxFe1−x)82.5B17.5玻璃的磁性和热性能

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90313-8

Z. Altounian, D.H. Ryan

{"title":"Magnetic and thermal properties of (NdxFe1−x)82.5B17.5 glasses","authors":"Z. Altounian, D.H. Ryan","doi":"10.1016/0025-5416(88)90313-8","DOIUrl":"10.1016/0025-5416(88)90313-8","url":null,"abstract":"<div>The effects of iron substitution by neodymium on the structural and magnetic properties of glassy FeB at the eutectic composition have been studied. Metallic glasses of composition (NdxFe1−x)82.5B17.5 were obtained by melt spinning for 0 ⩽ x ⩽ 0.25. The crystallization temperature (measured at a heating rate of 40 K min−1) rises to a maximum of 956 K at x = 0.10 and then falls as x → 0.25 because of the appearance of tetragonal Nd2Fe14B as the primary crystallization product. The ordering temperature and iron moment are both extremely sensitive to alloying with neodymium, decreasing with <math><mtext>d</mtext><mtext>T</mtext><msub><mi></mi><mn><mtext>c</mtext></mn></msub><mtext>d</mtext><mtext>x</mtext><mtext> = 950 K (</mtext><mtext>at.% Nd</mtext><mtext>)</mtext><msup><mi></mi><mn>−1</mn></msup></math> and dμFe/dx = 4.7μB (at.% Nd)−1 respectively, and even by x = 0.2 the neodymium dominates the magnetic properties.</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)90313-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88303190","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: 8

Crystallization of the AlMn icosahedral phase AlMn二十面体相的结晶

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90362-X

K.F. Kelton, J.C. Holzer

引用次数: 9

Influence of quench rate and hydrogen absorption on the magnetic properties of melt-spun Nd15Fe77B8 淬火速率和吸氢量对熔纺Nd15Fe77B8磁性能的影响

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90310-2

J.M. Cadogan, D.H. Ryan , J.M.D. Coey

{"title":"Influence of quench rate and hydrogen absorption on the magnetic properties of melt-spun Nd15Fe77B8","authors":"J.M. Cadogan, D.H. Ryan , J.M.D. Coey","doi":"10.1016/0025-5416(88)90310-2","DOIUrl":"10.1016/0025-5416(88)90310-2","url":null,"abstract":"<div>The effects of wheel speed and hydrogen absorption on the magnetic properties of melt-spun Nd15Fe77B8 have been studied using Mössbauer spectroscopy, magnetization measurements, differential scanning calorimetry and thermopiezic analysis (TPA).Samples prepared at wheel speeds up to 30 m s−1 consist mainly of microcrystalline tetragonal Nd2Fe14B. At speeds greater than 50 m s−1 the samples are composed of an amorphous phase, which orders magnetically at 435 K and crystallizes at 890 K. A mixture of crystalline and amorphous phases is obtained at intermediate wheel speeds.TPA measurements show that hydrogen absorption proceeds via as many as three stages; the primary absorption of microcrystalline Nd2Fe14B is at 680 K, whereas that of the ingot is at 530 K and that of the amorphous alloy is at 620 K. The Curie temperature and hyperfine field in amorphous Nd15Fe77B8 (430 K and 27 T respectively) are considerably less than in crystalline Nd2Fe14B. Hydrogenation raises the hyperfine field but leaves the Curie temperature almost unchanged.</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)90310-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88810001","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: 13

Magnetic anisotropy and process parameters in a nearly zero-magnetostriction metallic glass Fe4.5Co66Ni3.5Nb2Cr1B14Si9 近零磁致伸缩金属玻璃Fe4.5Co66Ni3.5Nb2Cr1B14Si9的磁各向异性和工艺参数

Materials Science and Engineering Pub Date : 1988-03-01 DOI: 10.1016/0025-5416(88)90297-2

C. Hargitai, C. Kopasz, S. Németh, B. Albert

{"title":"Magnetic anisotropy and process parameters in a nearly zero-magnetostriction metallic glass Fe4.5Co66Ni3.5Nb2Cr1B14Si9","authors":"C. Hargitai, C. Kopasz, S. Németh, B. Albert","doi":"10.1016/0025-5416(88)90297-2","DOIUrl":"10.1016/0025-5416(88)90297-2","url":null,"abstract":"<div>The role of the empirical cooling rate Λ/t (where Λ is the thermal conductivity of the chill block and t is the ribbon thickness) is investigated in a nearly zero-magnetostrictive metallic glass Fe4.5Co66Ni3.5Nb2Cr1B14Si9. The average magnetostriction constant measured was −1.3 × 10−8. The glassy ribbons were prepared by planar flow casting using various process parameters at the Csepel Metalworks. Pure copper and Cu-2wt.% Be were used as the chill blockmaterial. The following parameters of the ribbons were measured: the actual chemical composition, the average thickness, the temperature coefficient of resistivity, the microhardness, the coercive forces measured parallel and perpendicular to the ribbon axis, the saturation magnetization, the saturation magnetostriction constant, the dynamic magnetic permeability and the quasi-static hysteresis curves. The preliminary search for correlation among the measured data has revealed that the in-plane anisotropy of the coercive force can effectively play the same dominant role as the empirical cooling rate. In this way, we conclude that in a zero-magnetostriction alloy the magnetic parameters are essentially determined by the anisotropies created during the production of the ribbons. The long-term room temperature aging of the ribbons was also investigated.</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)90297-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89722164","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: 4