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  • 2005-2009  (2,350)
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  • 1
    Monograph available for loan
    Monograph available for loan
    Evolution of an Andean margin : a tectonic and magmatic view from the Andes to the Neuquén Basin (35° - 39° S lat) (2006)
    Boulder, Colo. : Geological Soc. of America
    Details Availability
    Call number: 9/90.0095(407)
    Type of Medium: Monograph available for loan
    Pages: X, 359 S. , Ill., graph. Darst., Kt. , 28 cm
    ISBN: 0813724074 , 9780813724072
    Series Statement: Special paper / Geological Society of America 407
    URL: http://www.loc.gov/catdir/toc/fy0704/2006298908.html
    Language: English
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    The Andes : active subduction orogeny (2006)
    Cambridge, Mass. [u. a.] : Blackwell Science [u. a.]
    Associated volumes
    Details Availability
    Call number: 4/M 06.0525 ; M 07.0232 ; M 17.88858 ; M 17.88858/2.Ex.
    In: Frontiers in earth sciences
    Description / Table of Contents: Contents: The big picture.- Elements of the subduction system.- Tectonics and surface processes - Responses to change.- The system at depth: Images and models.- The Andean information system: Data, maps and movies.
    Type of Medium: Monograph available for loan
    Pages: 568 S. + 1 DVD
    Edition: 1. ed
    ISBN: 3540243291
    Series Statement: Frontiers in earth sciences
    Location: Reading room
    Location: Upper compact magazine
    Location: Upper compact magazine
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of Ta-12.5Si-25B Powders by Mechanical Alloying (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 530-531 (Nov. 2006), p. 197-202 
    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 present work reports on the preparation of the Ta5SiB2 compound by highenergyball milling and subsequent heat treatment from elemental Ta-12.5at%Si-25at%Bpowder mixture. The milling process was carried out at room temperature in a planetary ballmill under argon atmosphere. Following the milling process, the powders were heat-treated at1200oC for 4h under Ar atmosphere in order to obtain the equilibrium microstructure. Themilled and heat-treated powders were characterized by X-ray diffraction (XRD) and scanningelectron microscopy (SEM). Results indicated that the Si peaks disappeared after milling for1h. It was noted that the broadening and the reduced intensity of Ta peaks occurredcontinuously up to milling for 10h, suggesting that the Si and B atoms were preferentiallydissolved into the Ta lattice during ball milling to form a supersaturated solid solution. A halowas formed in Ta-12.5at%Si-25at%B powders milled for 100h, suggesting that an amorphousphase was achieved. No intermetallic phase was formed in powders milled for 200h. A largeamount of Ta5SiB2 was formed after heat treatment at 1200oC for 4h. In addition, peaks ofTaB and another unknown phase were also identified
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.197.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    High-Energy Ball Milling of Ni-Ti and Ni-Ti-Nb Powders (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 530-531 (Nov. 2006), p. 211-216 
    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 work reports on the preparation of Ni-50Ti and Ni-40Ti-10Nb and Ni-30Ti-20Nb (at.%) powders by high-energy ball milling and subsequent heat treatment. The millingprocess was carried out at room temperature in a planetary ball mill under Ar atmosphere. Theas-milled powders were than heat-treated at 900oC for 1h under Ar atmosphere. X-raydiffraction (XRD), scanning electron microscopy (SEM), and microanalysis via energydispersive spectroscopy (EDS) were used to characterize the milled and heat-treated powders.A metastable phase was initially formed in Ni-50Ti and Ni-40Ti-10Nb powders milled for 1h.Following the ball milling, the B2-NiTi compound was formed in these powder mixtures. Thedisordering of the B2-NiTi compound occurred owing the internal lattice strain after millingfor 30h. Two phases were identified in Ni-50Ti and Ni-40Ti-10Nb powders milled for 60h:the metastable phase previously reported, and an amorphous phase. In Ni-30Ti-20Nbpowders, it was noted the presence of an amorphous halo only. A structural relaxation of theB2-NiTi phase occurred in heat-treated Ni-50Ti, Ni-40Ti-10Nb, and Ni-30Ti-20Nb powders.A small amount of Ni3Ti and NiTi2 was also formed after heat treatment at 900oC for 1h, andan iron contamination lower than 2at.% was found
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.211.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Structural Evaluation of Mechanically Alloyed Ti-Nb Powders (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 591-593 (Aug. 2008), p. 141-146 
    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 work discusses on the structural evaluation of mechanically alloyed Ti-Nb powders.The Nb amount was varied between 20 and 50 wt-%. The milling process was carried out in aplanetary Fritsch P-5 ball mill under Ar atmosphere. The structural evaluation was conducted byscanning electron microscopy, X-ray diffraction, and energy dispersive spectrometry. During ballmilling it was noted an excessive agglomeration of ductile Ti-Nb powders on the balls and vialsurfaces, and the final amount of remaining powders was then drastically reduced into the vials.This fact was more pronounced with the increased Nb amount in starting powders. Typical lamellastructures were formed during ball milling, which were refined for the longest milling times, andfine and homogeneous structures were formed in Ti-Nb (Nb=20-50wt-%) powders. XRD resultsindicated that the full width at half maximum values of Ti peaks were continuously increased whilethat the crystallite sizes were reduced for longer milling times due to the severe plastic deformationprovided during ball milling of Ti-Nb powders. However, the EDS analysis revealed the presence ofNb-rich regions in Ti-Nb powders after ball milling. The critical ball milling behavior of ductile Ti-Nb powders contributed for reducing the yield powder and increasing the structural heterogeneity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.141.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Milling Parameters on the TiB and TiB〈sub〉2〈/sub〉 Formation in Ti-50at%B and Ti-66at%B Powders (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 591-593 (Aug. 2008), p. 135-140 
    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 work discusses on the effect of milling parameters on the TiB and TiB2 formation inTi-50at%B and Ti-66at%B powders, respectively. Both powder mixtures were processed in aplanetary ball Fritsch P-5 ball mill under Ar atmosphere, varying the milling parameters: rotaryspeed (150 and 200 rpm), size of balls (10 and 19mm diameter) and ball-to-powder weight ratio(2:1 and 10:1). In order to obtain the equilibrium structures the milled powders were heated at1200oC for 1h. Samples were characterized by X-ray diffraction (XRD), scanning electronmicroscopy (SEM), and thermal analysis (DSC). XRD results indicated that extended Ti(B) solidsolutions were formed during ball milling of Ti-50at%B and Ti-66at%B powders. After milling for170h it was noted the TiB and TiB2 formation in Ti-50B and Ti-66B powders processed underhigher-energy condition. DSC analysis revealed that the TiB2 formation was completed duringheating of mechanically alloyed Ti-66at%B powders only. After heating at 1200oC for 1h, a largeamount of TiB and TiB2 was found in Ti-B powders milled under higher energy condition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.135.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Structural Evaluation of Ti-22.2Si-11.1B Powders Milled with PCA Addition (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 591-593 (Aug. 2008), p. 147-153 
    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 large amount of the Ti6Si2B compound can be formed by mechanical alloying andsubsequent heat treatment from the elemental Ti-22.2at%Si-11.1at%B powder mixture, but theyield powder after ball milling is reduced due to an excessive agglomeration of ductile particles onthe balls and vial surfaces. This work reports on the structural evaluation of Ti-22.2at%Si-11.1at%Bpowders milled with PCA addition, varying its amount between 1 and 2 wt-%. The milling processwas carried out in a planetary ball mill under argon atmosphere, and the milled powders were thenheated at 1200oC for 1h under Ar atmosphere in order to obtain equilibrium structures. Sampleswere characterized by X-ray diffraction, scanning electron microscopy, and thermal analysis.Results revealed that the PCA addition reduced the excessive agglomeration during the ball millingof Ti-22.2at-%Si-11.1at-%B powders. After heating at 1200oC for 1h, the Ti5Si3, Ti3O and/or Ti2Cphases were preferentially formed in Ti-22.2at%Si-11.1at%B powders milled with PCA addition,and the Ti6Si2B formation was inhibited
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.147.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Syntheses of the Ni〈sub〉3〈/sub〉Ti, NiTi, and NiTi〈sub〉2〈/sub〉 Compounds by Mechanical Alloying (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 530-531 (Nov. 2006), p. 217-222 
    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 aim of this work is to prepare the Ni3Ti, NiTi, and NiTi2 compounds bymechanical alloying from elemental Ni-25at.%Ti, Ni-50at.%Ti, and Ni-66.6at.%Ti powdermixtures. The milling process was carried out in a planetary ball mill under argon atmosphereusing a rotary speed of 200rpm, stainless steel balls (10 and 19 mm diameters) and vials(225mL), and a ball-to-powder weight ratio of 10:1. Following, the milled powders were heattreated at 900oC for 1h in order to attain the equilibrium microstructures. The milled powderswere characterized by means of X-ray diffraction (XRD), scanning electron microscopy(SEM), and microanalysis via EDS. Similar ball milling behavior of Ni-Ti powders was notedin this work, e.g., a pronounced cold-welding between ductile powders occurred during theinitial milling times. The Ni3Ti, NiTi, and NiTi2 compounds were synthesized after millingfor 30h. Atomic disordering of the NiTi and NiTi2 compounds was achieved, and amorphousstructures were then formed in Ni-50Ti e Ni-66.6Ti powders milled for 60h and 210h,respectively. Homogeneous matrixes constituted by the Ni3Ti, NiTi, and NiTi2 phases wereformed in Ni-Ti powders after heat treatments at 900oC for 1h. Iron contamination lower than2 at-% was measured by EDS analysis in heat-treated Ni-Ti alloys
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.217.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Preparation of Nb-40Ti Powders by High-Energy Milling (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 498-499 (Nov. 2005), p. 146-151 
    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: Porous Ti-Nb alloys are promising candidates for biomedical applications. In the present study, alloy powders containing 60 wt-% Nb were prepared by high-energy milling of Nb, Ti, and/or TiH2 powders. The high-energy milling process was carried out in a planetary ball mill. The starting and as-milled materials were characterized by X-ray diffraction (XRD), and scanning electron microscopy (SEM). Elemental (Nb, and Ti) and TiH2 powder mixtures with composition Nb-40wt%Ti were mechanically alloyed for 2 to 30 h. The formation of a BCC Nb(Ti) solid solution by high-energy milling using elemental Ti powder to produce Nb-40Ti was observed after milling for 30 h. A HCP-Ti solid solution was formed after milling for 30 h due to the partial decomposition of titanium hydride powder mixture during high-energy milling
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.498-499.146.pdf
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  • 10
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    Tectonic evolution of the Colombian Andea (2006)
    In:  Journal of South American Earth Sciences, Special Issue, vol. 21, no. 4, pp. 319-520
    Details
    Publication Date: 2006
    Keywords: CC 1/2 ; Coordinating Committee ; Andean
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    BIBLIOGRAPHY ILP
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