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Critical Current Anisotropy, Pinning Properties and Relaxation Rate of “Ex‐situ” MgB2/Fe Tapes “非原位”MgB2/Fe带的临界电流各向异性、钉钉性能和弛豫率
Advances in cryogenic engineering Pub Date : 2006-04-21 DOI: 10.1063/1.2192407
C. Senatore, P. Lezza, R. Flukiger
{"title":"Critical Current Anisotropy, Pinning Properties and Relaxation Rate of “Ex‐situ” MgB2/Fe Tapes","authors":"C. Senatore, P. Lezza, R. Flukiger","doi":"10.1063/1.2192407","DOIUrl":"https://doi.org/10.1063/1.2192407","url":null,"abstract":"Hysteresis and magnetic relaxation measurements have been performed on MgB2/Fe tapes in parallel and perpendicular magnetic field in order to investigate the correlation between the anisotropy of the transport current density and the texturing recently analysed by Lezza et al.. Volume pinning forces FP have been obtained from the current densities Jc as a function of the dc magnetic field up to 9 T in the temperature range 5–35 K. The reduced pinning forces do not scale with temperature in the parallel field configuration. It has been shown that this could be explained considering that the texturing occurs mainly at the surface of the sample. The scaling is recovered in perpendicular field for temperature higher than 20 K and the scaled pinning curves have been compared to theoretical predictions. Furthermore, the anisotropy of the pinning properties has been investigated using the present relaxation measurements. The magnetization was found to decrease linearly with ln(t). This allows calculation of the pinning potential energy U0 by using the relationship U0 = kT/{dM/[M0 dln(t)]}. The resulting variation of U0 in field and temperature is not related to the field orientation. The relaxation rate of MgB2 has been compared to other superconducting compounds, i.e. Bi‐2223 and Nb3Sn.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"106 1","pages":"654-661"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192407","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59399089","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: 6
Waveform of Loss Voltage in Ag‐Sheathed Bi2223 Superconducting Tape Carrying AC Transport Current 银壳Bi2223超导带载交流输运电流损耗电压波形
Advances in cryogenic engineering Pub Date : 2006-04-21 DOI: 10.1063/1.2192435
D. Nguyen, P. Sastry, J. Schwartz
{"title":"Waveform of Loss Voltage in Ag‐Sheathed Bi2223 Superconducting Tape Carrying AC Transport Current","authors":"D. Nguyen, P. Sastry, J. Schwartz","doi":"10.1063/1.2192435","DOIUrl":"https://doi.org/10.1063/1.2192435","url":null,"abstract":"In AC loss measurements of superconductors using the four‐terminal method, the voltage measured consists of two components. The loss voltage component is in phase with transport current while the inductive voltage is out of phase with transport current. Here we report on the use of a compensation coil to nearly cancel the inductive voltage. The loss voltage was amplified by a transformer amplifier and observed on a digital oscilloscope. The waveform of the measured voltage was compared with that of a calculated signal. The loss voltage was analytically calculated for a round wire using the critical state model. The effects of frequency on the waveform of the loss voltage are also studied. Finally, a comparison between waveforms of loss voltages obtained with sine‐wave and triangle‐wave transport currents are presented.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"869-876"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192435","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59400420","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: 0
Cryogenic Treatment of Metal Parts 金属零件的低温处理
Advances in cryogenic engineering Pub Date : 2006-04-21 DOI: 10.1063/1.2192336
Rahul J. Chillar, S. Agrawal
{"title":"Cryogenic Treatment of Metal Parts","authors":"Rahul J. Chillar, S. Agrawal","doi":"10.1063/1.2192336","DOIUrl":"https://doi.org/10.1063/1.2192336","url":null,"abstract":"Cryogenic treatment and its variables have been described. Results of eight engineering tests carried out on cryotreated parts have been presented. Cryogenic treatment of metal parts enhances useful properties which in turn, improves various strengths. Our tests viz. Abrasion, Torsion, Fatigue, Tensile, Shear, Hardness and Impact on Mild steel, Cast Iron, Brass and Copper show that the cryogenic treatment improved useful properties of mild steel parts appreciably but did not show promise with brass and copper parts.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"77-82"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192336","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59395715","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
Microstructure and Cryogenic Mechanical Properties of a 316L Plate and Its Weldments 316L板材及其焊接件的显微组织和低温力学性能
Advances in cryogenic engineering Pub Date : 2006-04-21 DOI: 10.1063/1.2192339
Ke Han, R. Walsh, V. Toplosky, R. Goddard, M. Bird
{"title":"Microstructure and Cryogenic Mechanical Properties of a 316L Plate and Its Weldments","authors":"Ke Han, R. Walsh, V. Toplosky, R. Goddard, M. Bird","doi":"10.1063/1.2192339","DOIUrl":"https://doi.org/10.1063/1.2192339","url":null,"abstract":"This paper reports a study to relate microstructure to cryogenic mechanical properties of a 316L plate and its weldments. Both the tensile and fracture toughness test values at 4 K are governed by microstructure that is influenced by the thermo‐mechanical treatment of the materials. The mechanical properties are better when the loading direction is parallel to the rolling directions. 77 K Charpy impact values show much stronger dependence on the orientations than 4 K fracture toughness and tensile test values. This indicates that the anisotropy in microstructure results in much higher anisotropy in fracture mechanisms in dynamic mode than in static mode. Therefore, care has to be taken when one relates the 77 K Charpy impact strength to 4 K fracture toughness. Stress relieve in weldment enhances the fracture toughness and yield strength, but reduces the strain‐hardening rate and ultimate tensile strength.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"99-106"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192339","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59395867","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: 2
Tensile Property of Al-Mg-Sc-Zr Alloy at Cryogenic Temperature Al-Mg-Sc-Zr合金的低温拉伸性能
Advances in cryogenic engineering Pub Date : 2006-04-21 DOI: 10.1063/1.2192348
W. Zhao, D. Yan, Xiutao Li, L. Rong, Yuntao Li
{"title":"Tensile Property of Al-Mg-Sc-Zr Alloy at Cryogenic Temperature","authors":"W. Zhao, D. Yan, Xiutao Li, L. Rong, Yuntao Li","doi":"10.1063/1.2192348","DOIUrl":"https://doi.org/10.1063/1.2192348","url":null,"abstract":"The tensile property and fracture characteristic of Al‐Mg‐Sc‐Zr alloy have been investigated at 77 K, 123 K, 173 K, 223 K and 300 K respectively. Both the strength and elongation improved with decreasing temperature from 300 K to 77 K, particularly between 123 K and 77 K. However, the reduction of area exhibited a maximum at around 173 K. The fractographs of tensile specimens show a completely dimple‐type ductile mode of fracture at 77 K and mixed type of fracture at 300 K, and the primary Al3(Sc,Zr) and Al6(Mn,Fe) phases are responsible for void and crack initiation at their interface with the matrix at cryogenic temperature.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"169-175"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192348","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59396491","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: 1
Tensile Behavior and Damage/Acoustic Emission Characteristics of Woven Glass Fiber Reinforced/Epoxy Composite Laminates at Cryogenic Temperatures 低温下编织玻璃纤维增强/环氧复合材料层合板的拉伸性能和损伤/声发射特性
Advances in cryogenic engineering Pub Date : 2006-04-21 DOI: 10.1063/1.2192358
Y. Shindo, F. Narita, K. Horiguchi, Satoru Takano, T. Takeda, K. Sanada
{"title":"Tensile Behavior and Damage/Acoustic Emission Characteristics of Woven Glass Fiber Reinforced/Epoxy Composite Laminates at Cryogenic Temperatures","authors":"Y. Shindo, F. Narita, K. Horiguchi, Satoru Takano, T. Takeda, K. Sanada","doi":"10.1063/1.2192358","DOIUrl":"https://doi.org/10.1063/1.2192358","url":null,"abstract":"This paper examines the tensile properties and damage behavior of glass fiber reinforced polymer (GFRP) laminates at cryogenic temperatures. Cryogenic tensile tests were conducted on three types of woven‐fabric laminate specimens, and information about the damage initiation and progression was provided by acoustic emission (AE) technique. A finite element model was also developed for progressive failure analyses of the three tensile test specimens, and applied to simulate the damage behavior in each specimen. A comparison was made between simulation and experiment.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"249-256"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192358","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59396977","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
MgB2 THIN FILMS FOR RADIATION DETECTORS OPERATING AT MICROWAVE FREQUENCIES 微波频率辐射探测器用MgB2薄膜
Advances in cryogenic engineering Pub Date : 2006-04-21 DOI: 10.1063/1.2192383
G. Ghigo, D. Botta, R. Gerbaldo, L. Gozzelino, F. Laviano, B. Minetti, D. Andreone, E. Monticone, E. Mezzetti
{"title":"MgB2 THIN FILMS FOR RADIATION DETECTORS OPERATING AT MICROWAVE FREQUENCIES","authors":"G. Ghigo, D. Botta, R. Gerbaldo, L. Gozzelino, F. Laviano, B. Minetti, D. Andreone, E. Monticone, E. Mezzetti","doi":"10.1063/1.2192383","DOIUrl":"https://doi.org/10.1063/1.2192383","url":null,"abstract":"The aim of this work is to investigate the potential of superconducting magnesium diboride (MgB2) thin films, prepared by the in‐situ method, as broadband radiation detectors based on the microwave measurement of the complex impedance. The characterization of the films at microwave frequencies has been obtained by a coplanar resonator technique. The data analysis results in the determination of penetration depth, surface impedance and energy gap. In view of their microwave properties, particularly of the gap structure, the possible use of such MgB2 films as photon detectors is discussed in detail.","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"463-470"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192383","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59398520","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: 1
Aluminum‐Stabilized Magnesium Diboride Superconductors 铝稳定的二硼化镁超导体
Advances in cryogenic engineering Pub Date : 2006-04-21 DOI: 10.1063/1.2192405
S. Dou, E. Collings, O. Shcherbakova, A. Shcherbakov
{"title":"Aluminum‐Stabilized Magnesium Diboride Superconductors","authors":"S. Dou, E. Collings, O. Shcherbakova, A. Shcherbakov","doi":"10.1063/1.2192405","DOIUrl":"https://doi.org/10.1063/1.2192405","url":null,"abstract":"Use of aluminum as stabilizer and iron as reaction barrier for fabrication of MgB2 superconductor wires was studied. The MgB2/Fe/Al or SiC doped MgB2/Fe/Al composite wires were made using Mg+ 2 B powder or SiC doped Mg+2 B powder in Fe/Al tube technique. The composites were processed at 600°C to 650°C for 30 minutes to 3 hours to study the interaction between Fe and Al sheath and the formation of MgB2. No reaction between Fe and Al was found until annealing temperature at 620°C for 30 minutes. A thin layer of alloy, FeAl3 is formed for samples annealed at 620°C for 90 minutes and the reaction layer increases with increasing annealing temperature. Annealing at 650°C resulted in cracks in the Al sheath. Our results show that the Fe/Al sheathed wires achieved the same performance in magnetic and electrical properties as those using an all‐Fe sheath. Comparing with the standard NbTi/Cu conductors, the MgB2/Fe/Al conductor having low structural mass, greater thermal conductivity and high efficient stabilizatio...","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"639-645"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192405","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59398751","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: 2
Superconducting and Mechanical Properties of Bi‐2223/Metal Alloy Wires Composite Bulk Bi‐2223/金属合金丝复合体的超导性和力学性能
Advances in cryogenic engineering Pub Date : 2006-04-21 DOI: 10.1063/1.2192431
S. Yoshizawa, S. Hirano, Y. Oya-Seimiya, Y. Hishinuma, A. Nishimura
{"title":"Superconducting and Mechanical Properties of Bi‐2223/Metal Alloy Wires Composite Bulk","authors":"S. Yoshizawa, S. Hirano, Y. Oya-Seimiya, Y. Hishinuma, A. Nishimura","doi":"10.1063/1.2192431","DOIUrl":"https://doi.org/10.1063/1.2192431","url":null,"abstract":"Bi‐2223 sintered bulk samples with addition of AgMg wires or Ag‐plated Ni wires have been prepared to improve both the superconducting and the mechanical properties, simultaneously. When 24 AgMg wires of 0.4 mm in diameter were added into Bi‐2223 bulk composite sample, the critical current density (Jc) at 77 K increased from 2 A/mm2 to 7 A/mm2. The mechanical properties have been estimated by a three‐point bending test. The maximum bending stress of 70 – 90 MPa at the rupture was obtained for Bi‐2223/metal wires composite bulk, regardless of the number of the wires. After the maximum bending stress, Bi‐2223 bulk without metal wires fractured separately, while the composite did not fracture but fine cracks were induced only. The Jc values of the composites just after the fracture were about half of the Jc value in the composites without bending. It has been observed that the superconducting current flows even after cracking, in Bi‐2223 bulk with metal wires. This is due to the fact that metal wires suppres...","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"834-839"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192431","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59399613","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: 0
Tensile, Fracture, and Fatigue Crack Growth Rate Behavior of High Manganese Steels 高锰钢的拉伸、断裂和疲劳裂纹扩展速率行为
Advances in cryogenic engineering Pub Date : 2006-04-21 DOI: 10.1063/1.2192343
A. Nyilas, K. Weiss, G. Grikurov, N. Zoidze
{"title":"Tensile, Fracture, and Fatigue Crack Growth Rate Behavior of High Manganese Steels","authors":"A. Nyilas, K. Weiss, G. Grikurov, N. Zoidze","doi":"10.1063/1.2192343","DOIUrl":"https://doi.org/10.1063/1.2192343","url":null,"abstract":"Mechanical low temperature investigations were carried out to determine the cryogenic mechanical properties of newly developed Fe‐Cr‐Mn alloys with contents of chromium between 5 % and 10 % and manganese between 30 % and 40 % under the Project G‐811, Russia. The final products were forged, rolled, and solution heat treated to obtain appropriate plate sizes necessary for the mechanical measurements. The tensile properties of these alloys determined between 4 K and 7 K show for certain alloy combination high elongation values at fracture of greater than 50 % with considerable high yield strengths around 900 MPa. The measured fracture toughness values with small scale compact tension specimens using elastic plastic J‐tests show KIC data between 100 MPa√m and 220 MPa√m according to the alloy combination. Fatigue crack growth rate (FCGR) measurements of these alloys result also in some alloy combination case, high resistance against crack propagation with measured Paris coefficients of m ∼ 5 and C ∼ 8.5 E‐13 m...","PeriodicalId":80359,"journal":{"name":"Advances in cryogenic engineering","volume":"824 1","pages":"130-137"},"PeriodicalIF":0.0,"publicationDate":"2006-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2192343","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59396097","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
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