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  • 1
    Electronic Resource
    Electronic Resource
    Titanium Alloy Ti6Al4V’s Corrosion Resistance Behavior by Double Glow Discharge Plasma Hydrogen-Free Carburizing Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 1197-1200 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The surface-modified Titanium alloy Ti6Al4V was obtained in the process of the doubleglow discharge plasma hydrogen-free carburizing. The high purity solid graphite as the sourcecathode supplied the carbon elements; pure titanium and its alloys were used as the cathode and argonas the working gas. At certain pressure and voltage, the glow discharge appeared between cathodeand anode, source cathode and anode. The carbon plasma flux, including carbon atoms, ions,sputtered by argon ions diffused into the substrate, which depended on ions bombardment andthermal diffusion at a negative voltage. High purity solid graphite cathode was done in a honeycombshape or grid shape. A layer with TiC and C phases was formed during the process. Surface hardnesswas increased by four times due to the presence of TiC and C phases, and wear resistance wasenormously improved. The C concentration and hardness of alloying layer changed gradually withthe depth. The corrosion properties of hydrogen-free carburized specimens were tested in the solutionof 5% NaCl and 5% H2SO4, using electrochemical corrosion method. The results showed that thecorrosion resistance of carburized specimens was significantly improved in 5% H2SO4 solution
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.1197.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructure Inhomogeneities in 2519A Aluminum Plate Penetrated by an Incendiary Projectile (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1049-1054 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 2519A aluminum plate was shot obliquely by an incendiary projectile with the diameter of7.62mm at impact velocity of 818m/s. The penetration inhomogeneities of the crater of 2519Aaluminum target plate were investigated with optical microscopy (OM), scanning electronmicroscopy (SEM). Melted substance, a mixture of the target material and the projectile was found atthe interface of target and projectile. Different microstructural characteristics were observed alongthe crater depth. Grains were elongated near the entrance area, while severely kinked grains andadiabatic shear bands were present in the middle region, and microbands, as well as abnormal growngrains, appeared at the crater bottom. The failure form of target is mainly ductile expanding
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1049.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Pre-Rolling Reduction on Intergranular Corrosion of Aluminum Alloy 2519A (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1117-1122 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of pre-rolling reduction prior to ageing on the size and distribution of theprecipitates, the width of precipitation free zones (PFZ) along grain boundaries and intergranularcorrosion (IGC) of aluminum alloy 2519A were investigated by hardness tests, scanning electronmicroscopy (SEM) and transmission electron microscopy (TEM). The experimental results showedthat the time for peak-age shortened when the reduction increased, which resulted in refining theprecipitatates and distributing homogeneously within the grains and hence the IGC decreased. Withincreasing pre-rolling reduction, the PFZ along grain boundaries became narrower and precipitateschanged from continuous chains to discrete distribution, which resulted in high IGC resistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1117.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of Particle Size on Microstructure of the Matrix Alloy in Aluminum Matrix Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1655-1659 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Aluminum matrix composites, reinforced by 0.15μm and 5μm Al2O3 particles with 40%volume fractions were fabricated by squeeze casting technique. The microstructure characterizationnear the interfaces of Al2O3p/1070Al composites was investigated by SADP and HREM techniques.Results showed that high-density dislocations were generated in the 5μm-Al2O3p/Al composite dueto the thermal mismatch stress. In contrast, the matrix of the 0.15μm-Al2O3p/Al composite appearedto be nearly free dislocations and some “micro distortion areas” of 1-5nm were observed, whichwas attributed to the dispersion of fine sub-micron particles and uniform distribution of the stressnear the interfaces
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1655.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructures and Dynamic Compression Properties of a High Reinforcement Content TiB〈sub〉2〈/sub〉/Al Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 639-642 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A high reinforcement content TiB2/2024Al composite with an average particle size of 8μmwas fabricated by squeeze casting technology. The dynamic compression behaviors of the compositeunder varied strain rates were measured using split Hopkinson pressure bar, and its microstructureand fracture characteristic were examined. Resluts revealed that the composite was dense andhomogenerous, and the TiB2-Al interface was clean without interfacial reactants. At high strain rate,the TiB2/Al composite showed insensitive to the strain rate, and both the flow stress and the elasticmodulus improved little with an increase of the strain rate. The composite failed macroscopically inshear fracture and in split, which were caused by cracking of large reinforcement particles andinterface failures under dynamic load
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.639.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Silicon Addition and Thermal History on the Thermal Expansion Behavior of SiC/Al Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 649-652 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two Al-Si alloys (Al-12Si and Al-20Si) and an industrial pure Al were reinforced with70vol.% dual-sized SiC particles. The composites experienced annealing treatment, to investigate theeffect of silicon addition and thermal history on the thermal expansion behavior of high SiC contentaluminum matrix composites. The results showed that silicon additions led to a beneficial reductionin the coefficients of thermal expansion (CTEs) of the composites. In the temperature range between20℃ and 400℃, a continuous increase in CTEs with temperature was observed for SiCp/pure Alcomposite. However, the CTEs of SiCp/Al-12Si and SiCp/Al-20Si showed the maxima at 350℃and250℃ respectively, then diminished at higher temperatures. This was related to the change of solidsolubility of silicon in aluminum at elevated temperatures. The thermal expansion behavior ofSiCp/Al composites was also influenced by thermal history. After annealing treatment, the CTEswere reduced when compared with those of as-cast composites. Annealing treatment reduced theoriginal thermal residual stresses, and then altered thermal expansion behavior of the composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.649.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Hot Deformation Behavior of 2519 Al Alloy during Isothermal Compression (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 749-754 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The deformation behavior of 2519 aluminum alloy was studied by isothermal compressionby Gleeble-1500 simulator in the temperature range from 300 to 450℃ under the strain rates of0.01~10s-1. The results showed that the flow stress was controlled by strain rate and deformationtemperature. The flow stress increased with strain rate and decreased with deformation temperature.The flow stress of 2519 aluminum alloy increased with strain and to the constant values at three strainrates of 0.01 s-1,0.1 s-1and1 s-1, indicating the dynamic recovery to occur. The flow stress decreasedafter a peak value with increase of strain at strain rate 10s-1 and deformation temperature higher than350℃, showing partly dynamic recrystallization. The flow stress of 2519 aluminum alloy during hightemperature deformation can be represented by Zener-Hollomon parameter
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.749.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Study on Temperature Distribution in Double Glow Discharge Zone (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 1281-1286 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper deals with the temperature measuring of the glow discharge zone in doubleglow plasma surface alloying process. CCD technique was employed to get the temperaturedistribution profile. The results show that CCD method is a simple and effective non-contacttemperature measuring technique, applicable in fields of low temperature and high temperatureplasma processes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.1281.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Time response of protection in event of vacuum failure based on Nude ionization gauge controller (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 3979-3982 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article describes the design and application of fast-response vacuum protection sensor module, based on the Nude ionization gauge and a homemade controller named GH07X. A simulative test indicated that the controller's response time was less than 200 μs when 1 atm air rushed into the vacuum system through a pulsed valve with 0.8 mm orifice nozzle and the emitting current of the Nude gauge was 4 mA. The experiment result showed that the response time mainly depended on the gas density as well as the electron emitting current of the Nude gauge filament. Compared with the vacuum protection sensors based on sputter ion pump and cold-cathode gauge, GH07X is faster and reliable besides, GH07X can be used as an ultrahigh-vacuum slow valve interlock controller with response time of 100 ms, which is faster than other gauge controllers. The widely used field–bus interface CAN and common serial interface RS232/RS485 are embedded in GH07X controller system. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1389493
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  • 10
    Electronic Resource
    Electronic Resource
    Workload characterization using the CRAY hardware performance monitor (1995)
    Springer
    The journal of supercomputing 9 (1995), S. 391-412 
    Details
    ISSN: 1573-0484
    Keywords: Performance evaluation ; benchmarking ; workload characterization ; hardware performance monitor ; Cray computers ; supercomputers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper describes some preliminary results about a workload characterization study at a national supercomputer center. This study is part of a larger project to develop an analytic methodology for the construction of arepresentative benchmark set. Our study reports on 292,254 user jobs during the period from June 1992 to July 1993 and represents about one-half of the wall clock time available on the four-processor CRAY Y-MP at the National Center for Supercomputing Applications during this time. The performance statistics we gathered in some sensedefine the workload because of the large fraction of the available time that was recorded. These statistics will allow us to “reverse engineer” a set of benchmarks that analytically represents the workload at this site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01206274
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