Materials Transactions Jim最新文献_第6页

Electrical Conductivity Measurement for Estimation of Standard Gibbs Energy Change of Ternary Oxide Formation 电导率测量估算三元氧化物形成的标准吉布斯能量变化

Materials Transactions Jim Pub Date : 2000-12-01 DOI: 10.2320/MATERTRANS1989.41.1646

T. Akashi, Toshihiko Inoue, T. Maruyama

引用次数: 3

Friction Bonding of Silicon Carbide to Oxygen-Free Copper with an Intermediate Layer of Reactive Metal 含中间活性金属层的碳化硅与无氧铜的摩擦键合

Materials Transactions Jim Pub Date : 2000-12-01 DOI: 10.2320/MATERTRANS1989.41.1636

A. Nishimoto, M. Ando, M. Takahashi, M. Aritoshi, K. Ikeuchi

{"title":"Friction Bonding of Silicon Carbide to Oxygen-Free Copper with an Intermediate Layer of Reactive Metal","authors":"A. Nishimoto, M. Ando, M. Takahashi, M. Aritoshi, K. Ikeuchi","doi":"10.2320/MATERTRANS1989.41.1636","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1636","url":null,"abstract":"Intermediate layers of various metals ranging from reactive metals to noble metals have been applied to friction bonding of SiC (pressureless-sintered silicon carbide) to Cu (oxygen-free copper), and their influences on the bond strength and microstructures of the joint have been systematically investigated by means of TEM observations. When a thin foil of reactive metal, Al, Ti, Zr, or Nb, was applied as the intermediate layer, the bond strength of SiC to Cu was improved considerably. In contrast, when an intermediate layer of Fe, Ni, or Ag was applied, the SiC specimen separated from the Cu specimen immediately after the bonding operation without the application of external load, similar to the case of bonding without an intermediate layer. During friction bonding with an intermediate layer of reactive metal, the intermediate layer was mechanically mixed with Cu lo form a very complicated microstructure extending over a region as wide as a few 100 μm TEM observations have revealed that very thin reaction layers between the SiC and reactive metals were formed. When the Ti intermediate layer was applied, a TiC layer 10-30 nm thick was formed over almost the entire area along the interface, and between this layer and the SiC matrix a very thin layer of a Cu solid solution was detected. On the other side of the TiC layer, a Ti 5 Si 3 layer ∼100 nm thick was partially observed. When the Nb or Zr intermediate layer was applied, a very thin interfacial layer, in which Nb or Zr was significantly concentrated, was observed in addition to the reaction layers of Nb 5 Si 3 , NbC, and ZrC. These interfacial layers can he characterized by their much smaller thickness and finer grain size than those observed in diffusion-bonded and brazed joints. Apart from the layers mentioned above, amorphous silicon oxide layers were occasionally observed, suggesting that the reactive metal enhanced the removal of the oxide film on the SiC surface.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"41 1","pages":"1636-1645"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78101243","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: 5

Giant Magnetoimpedance Effect in NiFeMo Permalloy Ribbon NiFeMo坡莫合金带中的巨磁阻抗效应

Materials Transactions Jim Pub Date : 2000-12-01 DOI: 10.2320/MATERTRANS1989.41.1589

Jifan Hu, H. Qin, Shao-xiong Zhou, Yi-zhong Wang, Zhenxi Wang

引用次数: 12

Formation and magnetic properties of bulk glassy Fe-Co-Nd-Dy-B alloys with high boron concentrations 高硼Fe-Co-Nd-Dy-B大块玻璃状合金的形成和磁性能

Materials Transactions Jim Pub Date : 2000-12-01 DOI: 10.2320/MATERTRANS1989.41.1679

Wei Zhang, A. Inoue

{"title":"Formation and magnetic properties of bulk glassy Fe-Co-Nd-Dy-B alloys with high boron concentrations","authors":"Wei Zhang, A. Inoue","doi":"10.2320/MATERTRANS1989.41.1679","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1679","url":null,"abstract":"New Fe-based glassy alloys in Fe-Co-Nd-Dy-B system with high boron concentrations were found to exhibit a wide supercooled liquid region exceeding 50 K. The high stability of the supercooled liquid enabled us to produce cylindrical bulk glassy alloys with diameters up to 0.75 mm by copper mold casting. The glass transition temperature (T g ), crystallization temperature (T x ), supercooled liquid region ΔT x (=T x - T g ) and heat of crystallization of the Φ0.75 mm rod of glassy Fe 62 Co 9.5 Nd 3 Dy 0.5 B 25 alloy are 844 K, 899 K, 55 K and 4.46 kJ/mol, respectively. No appreciable difference in the thermal stability is seen between the bulk rods and melt-spun ribbon. The saturation magnetization (I s ), coercive force (H c ), saturated magnetostriction (λ s ) and Curie temperature (T c ) of the melt-spun Fe 62 Co 9,5 Nd 3 Dy 0.5 B 25 ribbon are 1.37T, T, 4.58 A/m, 17.9 × 10 -6 and 663 K, respectively, and I s and T c are nearly the same as those for the bulk glass rods with diameters of 0.5 and 0.75 mm. The success of forming the Fe-based bulk glassy alloys exhibiting good soft magnetic properties is promising for future development as a new type of soft magnetic material.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"10 1","pages":"1679-1682"},"PeriodicalIF":0.0,"publicationDate":"2000-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78577363","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: 24

Electrocatalytic Activity of Co0.5Ni0.5O Particles for the Anodic Oxidation of Methane Co0.5Ni0.5O颗粒对甲烷阳极氧化的电催化活性

Materials Transactions Jim Pub Date : 2000-12-01 DOI: 10.2320/MATERTRANS1989.41.1621

Kazunori Sato, K. Sakamaki, Y. Inoue

引用次数: 1

The Short-Range Atomic Order in Amorphous and Liquid ZnSnAs2 非晶态和液态ZnSnAs2的短程原子序

Materials Transactions Jim Pub Date : 2000-12-01 DOI: 10.2320/MATERTRANS1989.41.1612

O. Uemura, Keigo Abe, Ryoki Uejyoh, T. Usuki, Y. Kameda

引用次数: 0

Preparation and Properties of Mg–Cu–Y–Al Bulk Amorphous Alloys Mg-Cu-Y-Al块状非晶合金的制备及性能研究

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1435

N. Pryds, M. Eldrup, M. Ohnuma, A. Pedersen, J. Hattel, S. Linderoth

{"title":"Preparation and Properties of Mg–Cu–Y–Al Bulk Amorphous Alloys","authors":"N. Pryds, M. Eldrup, M. Ohnuma, A. Pedersen, J. Hattel, S. Linderoth","doi":"10.2320/MATERTRANS1989.41.1435","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1435","url":null,"abstract":"Bulk amorphous (Mg 1-y Al y ) 60 Cu 30 Y 10 alloys were prepared using a relatively simple technique of rapid cooling of the melt in a copper wedge mould. The temperature vs. time was recorded during the cooling and solidilication process of the melt and compared with a spacial and temporal numerical simulation of that process. It is concluded that good thermal contact is maintained between the amorphous part of the solidified sample and the mould, while a rather poor contact develops between the crystalline part of the sample and the mould, probably due to the appearance of a narrow gap at the crystal-mould interface during crystallisation. The maximum amorphous layer thickness decreases from ∼3 mm to zero when the Al content increases in the range from 0 to about y = 10%. The evolution of the microstructure of the initially amorphous phase was examined by x-ray diffraction (XRD) and differential scanning calorimetry (DSC) for different alloy compositions and annealing temperatures. On annealing into the supercooled liquid state (441 K), specimens with no Al content remain basically amorphous while nanoparticles are formed and remain stable also at higher temperatures in specimens containing a few percent Al. The alloy with no Al crystallises apparently without the formation of nanoparticles. The critical cooling rate for the formation of an amorphous Mg 60 Cu 30 Y 10 specimen was determined experimentally by a combination of DSC data and temperature vs. time measurements to be 60-150 K/s, in agreement with estimates from the literature. The Vickers hardness (H V ) of the amorphous material for y = 2% is higher (∼360 kg/mm 2 ) than for y = 0 (∼290 kg/mm 2 ). On crystallisation the hardness of the latter material increases to the 400 kg/mm 2 level while the hardness of the former does not change.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"16 1","pages":"1435-1442"},"PeriodicalIF":0.0,"publicationDate":"2000-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79361296","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: 32

Deformation Mechanisms of Superplastic Al–Li 8090 Alloy Examined by X-Ray Texture Measurements 超塑性Al-Li 8090合金的x射线织构分析

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1562

M. Pérez-Prado, M. Cristina, O. Ruano, G. González-Doncel

{"title":"Deformation Mechanisms of Superplastic Al–Li 8090 Alloy Examined by X-Ray Texture Measurements","authors":"M. Pérez-Prado, M. Cristina, O. Ruano, G. González-Doncel","doi":"10.2320/MATERTRANS1989.41.1562","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1562","url":null,"abstract":"The texture evolution of the Al-Li alloy 8090 has been investigated in order to analyze the microscopic mechanisms operative during deformation under different conditions of temperature and strain rate. A through-thickness texture gradient is present in the as-received material. As will be seen, the predominant deformation mechanisms are different in the mid layer and in the outer regions of the 8090 sheet alloy. In the outer regions, the texture intensity decreases with deformation and no significant changes in the main components were observed, indicating the predominance of grain boundary sliding (GBS). In the mid-layer, however, texture sharpens with straining and major changes in the main texture components were detected, revealing that crystallographic slip (CS) plays an important role in the deformation of this zone. CS takes place mainly in two slip systems and causes the orientations to move along the β-fiber in Euler space, towards the Copper component in longitudinal tests and towards the Brass component in transverse tests. The comparably small ductility of the 8090 alloy, with respect to other similar superplastic aluminum alloys, may be due to the operation of CS in the mid-layer.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"2 1","pages":"1562-1568"},"PeriodicalIF":0.0,"publicationDate":"2000-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78369531","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: 3

Microstructure and Compressive Properties of In Situ Synthesized (TiB + TiC)/Ti Composites 原位合成(TiB + TiC)/Ti复合材料的微观结构和压缩性能

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1555

W. Lu, Di Zhang, Xiaonong Zhang, R. Wu, T. Sakata, H. Mori

{"title":"Microstructure and Compressive Properties of In Situ Synthesized (TiB + TiC)/Ti Composites","authors":"W. Lu, Di Zhang, Xiaonong Zhang, R. Wu, T. Sakata, H. Mori","doi":"10.2320/MATERTRANS1989.41.1555","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1555","url":null,"abstract":"TiB and TiC reinforced titanium matrix composites have been produced by non-consumable arc-melting technology utilizing the self-propagation high-temperature synthesis reactions between titanium and B 4 C, graphite. X-ray diffraction (XRD) was used to identify the phases in the composites. Microstructures of composites have been observed by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HREM). The results show that there are three phases in the composite: TiB, TiC and titanium matrix alloy, Reinforcements are distributed uniformly in the matrix. TiB grows in short-fiber shape and TiC grows in dendritic, equiaxed shapes. The interfaces between reinforcements and titanium matrix alloy are very clean. There is no any interfacial reaction. There are high-density dislocations around TiC particle. Mechanical properties have been improved due to the incorporation of reinforcements. The addition of aluminum not only strengthens the titanium matrix alloy by solid solution strengthening, but also improves the mechanical properties of composites by refining the reinforcements and matrix alloy.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"24 1","pages":"1555-1561"},"PeriodicalIF":0.0,"publicationDate":"2000-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85609307","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

Growth of a single Al64Cu23Fe13 icosahedral quasicrystal using the Czochralski method and annealing removal of strains 用Czochralski法生长单个Al64Cu23Fe13二十面体准晶并退火去除应变

Materials Transactions Jim Pub Date : 2000-11-20 DOI: 10.2320/MATERTRANS1989.41.1583

Y. Yokoyama, K. Fukaura, H. Sunada, K. Hiraga, A. Inoue

引用次数: 8