Formation of ordered and disordered interfacial films in immiscible metal alloys
نویسندگان
چکیده
Article history: Received 9 August 2016 Received in revised form 8 November 2016 Accepted 20 November 2016 Available online xxxx Atomistic simulations are used to study segregation-induced intergranular film formation in Cu\\Zr and Cu\\Nb alloys. While Cu\\Zr forms structurally disordered or amorphous films, ordered films comprised of a second phase usually precipitate in Cu\\Nb, with a critical nucleation size of ~1 nm belowwhich the ordered phase cannot form. While the ordered film is retained at high temperature for a low energy Ʃ11 (113) boundary, a disordering transition is observed for a high energy Σ5 (310) boundary at low dopant concentrations. Finally, the effect of free surfaces on dopant segregation and intergranular film formation is investigated for both alloys. © 2016 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
منابع مشابه
Prediction and hydrogen acceleration of ordering in iron-vanadium alloys.
Ab initio calculations of binary metallic systems often predict ordered compounds in contrast to empirical reports of solid solutions or disordered phases. These discrepancies are usually attributed to slow kinetics that retains metastable structures at low temperatures. The Fe-V system is an example of this phenomenon, in which we predict two ordered stable ground states, Fe3V and FeV3, wherea...
متن کاملTopology-generating interfacial pattern formation during liquid metal dealloying
Liquid metal dealloying has emerged as a novel technique to produce topologically complex nanoporous and nanocomposite structures with ultra-high interfacial area and other unique properties relevant for diverse material applications. This process is empirically known to require the selective dissolution of one element of a multicomponent solid alloy into a liquid metal to obtain desirable stru...
متن کاملNanostructured Single Crystals Sandwiched between Ordered/Disordered Coily and Rod Brushes
Single crystals of poly(ethylene glycol) (PEG)-b-polystyrene (PS), PEG-b-poly(methyl methacrylate) (PMMA), PEG-b-polycaprolactone (PCL), and polyaniline (PANI)-b-PEG-b-PANI were developed from dilute solutions and thin molten films using self-seeding methodology. The PS and PMMA grafted chains were categorized in disordered nano-brushes; however, the PCL and PANI ones were grouped in ordere...
متن کاملMagneto-optical Kerr rotation spectra in ordered and disordered phases of Fe-Pt alloy films
The magneto-optical Kerr rotation (0,) spectra and the related properties have been measured in ordered and disordered phases of several kinds of Fe-R alloy films. The / 0, 1 in as-deposited (disordered) films becomes gradually larger with increasing Fe content until about SO at% Fe, but the shape of 0 k spectra does not change so much. After annealing, however, all the 0, spectra were changed....
متن کاملHigh-speed frictional slip at metal-on-metal interfaces
In this study plate-impact pressure-shear friction experiments are employed to investigate dynamic slip resistance and time-resolved growth of molten metal films during dry metal-on-metal slip under extreme interfacial conditions. By employing a tribo-pair comprising of a hard tool-steel against a relatively low melt-point metal (7075-T6 Al alloy), interfacial normal stress of up to 5 GPa and s...
متن کامل