Amorphization of CuTa alloys by mechanical alloying

Veltl, G.; Scholz, B.; Kunze, H.–D.

doi:10.1016/0921-5093(91)91002-a

Cited by 113 publications

(36 citation statements)

References 6 publications

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“…Structural coherence was reported for several systems with positive energy of mixing, such as Ag-Cu, 33 Cu-Cr, 29 or Cu-Fe, 34 but the mechanism responsible for this effect is still a subject of controversy. [35][36][37][38] Experimental results from nanometer-resolution methods such as atom probe field ion microscopy 30 or extended x-ray absorption fine structure could shed more light on the subject. It is though quite remarkable that in Mg-Ti, the coherent structure is preserved at all intermediate states during hydrogenation.…”

Section: Discussionmentioning

confidence: 99%

Structural, optical, and electrical properties ofMgyTi1−yHxthin films

et al. 2007

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Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. The structural, optical, and electrical transformations induced by hydrogen absorption and/or desorption in Mg-Ti thin films prepared by co-sputtering of Mg and Ti are investigated. Highly reflective in the metallic state, the films become highly absorbing upon H absorption. The reflector-to-absorber transition is fast, robust, and reversible over many cycles. Such a highly absorbing state hints at the coexistence of a metallic and a semiconducting phase. It is, however, not simply a composite material consisting of independent MgH 2 and TiH 2 grains. By continuously monitoring the structure during H uptake, we obtain data that are compatible with a coherent structure. The average structure resembles rutile MgH 2 at high Mg content and is fluorite otherwise. Of crucial importance in preserving the reversibility and the coherence of the system upon hydrogen cycling is the accidental equality of the molar volume of Mg and TiH 2 . The present results point toward a rich and unexpected chemistry of Mg-Ti-H compounds.

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Section: Discussionmentioning

confidence: 99%

Structural, optical, and electrical properties ofMgyTi1−yHxthin films

et al. 2007

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“…The mechanically milled structure is in a metastable state [18]. So it is generally expected that considerable structural and phase changes occur upon heating the milled powder [8].…”

Section: Isothermal Annealingmentioning

confidence: 99%

Microstructural evolution of nanostructure 7075 aluminum alloy during isothermal annealing

Yazdian

Karimzadeh

Tavoosi

2010

Journal of Alloys and Compounds

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“…Veltel et al [17] suggested that the energy stored in the grain boundaries of nanocrystalline materials is the driving force for the formation of solid solution. Free-energy increases due to the creation of new interface as a result of reduction in crystallite size.…”

Section: Thermodynamic Characteristicmentioning

confidence: 99%

Thermodynamic Characteristic and Phase Evolution in Immiscible Cr–Mo Binary Alloys

Sun

Shen

Zhang

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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This paper systematically reports the thermodynamic characteristic and phase evolution of immiscible Cr-Mo binary alloy during mechanical alloying (MA) process. The Cr-35Mo (in at%) powder mixture was milled at 243 and 258 K, respectively, for different time. For comparative study, Cr-15Mo and Cr-62Mo powder mixtures were milled at 243 K for 18 h. Solid solution Cr(Mo) with body-centered cubic (bcc) crystal structure and amorphous Cr(Mo) alloy was obtained during MA process caused by high-energy ball milling. Based on the Miedema's model, the free-energy change for forming either a solid solution or an amorphous in Cr-Mo alloy system is positive but small at a temperature range between 200 and 300 K. The thermodynamical barrier for forming alloy in Cr-Mo system can be overcome when MA occurs at 243 K, and the supersaturated solid solution crystal nuclei with bcc structure form continually, and three supersaturated solid solutions of Cr-62Mo, Cr-35Mo and Cr-15Mo formed. Milling the Cr-35Mo powder mixture at 258 K, the solid solution Cr(Mo) forms firstly, and then the solid solution Cr(Mo) transforms into the amorphous Cr(Mo) alloy with a few of nanocrystallines when milling is prolonged. At higher milling temperature, it is favorable for the formation of the amorphous phase, as indicated by the thermodynamical calculation for immiscible Cr-Mo alloy system.

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Amorphization of CuTa alloys by mechanical alloying

Cited by 113 publications

References 6 publications

Structural, optical, and electrical properties ofMgyTi1−yHxthin films

Structural, optical, and electrical properties ofMgyTi1−yHxthin films

Microstructural evolution of nanostructure 7075 aluminum alloy during isothermal annealing

Thermodynamic Characteristic and Phase Evolution in Immiscible Cr–Mo Binary Alloys

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