Analytical description of isothermal primary crystallization kinetics of glasses: Fe85B15 amorphous alloy

Tkatch, V.I.; Rassolov, S.G.; Moiseeva, T.N.; Попов, В. В.

doi:10.1016/j.jnoncrysol.2005.04.057

Cited by 23 publications

(18 citation statements)

References 26 publications

(55 reference statements)

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“…In this paper we attempt to apply the analytical approach [8] proposed for description of primary crystallization kinetics of Fe 85 B 15 metallic glass to nanocrystallization of Al 86 Ni 6 Co 2 Gd 3 Y 2 Tb 1 amorphous alloy and to generalize it for the case of the constant rate heating conditions. To test the validity of the proposed models the comparison between the experimental and calculated results has been made and the values of the effective diffusion coefficient which governs the diffusion-limited growth of nanocrystals in these glasses have been estimated.…”

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confidence: 99%

“…As the first step in description of the experimental data we have attempted to approximate the L(t) dependencies shown in Fig. 2(a) using the equation describing the changes of the radius of nanocrystal, R H , growing in conditions of essential impingement of diffusion fields [8] …”

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confidence: 99%

“…and finally the dependence of the nanocrystal radius on temperature under constant heating rate is expressed as (8) follows that the value of t eff may be considered as effective time of the diffusivity at heating rate of q.…”

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confidence: 99%

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Nanocrystallization of Al‐based glasses via nucleation and growth under “soft impingement” conditions

Rassolov

Tkatch

Maslov³

et al. 2010

Phys. Status Solidi (c)

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The nanocrystallization behaviour of Al86Ni6Co2Gd3Y2Tb1 amorphous alloy has been studied by X‐ray diffraction methods involving small angle scattering, resistance measurements and differential scanning calorimetry. It has been established that the transformation in amorphous alloy investigated occurs mainly by the growth process at initial state of transformation while at final stage nucleation contributes into formation of nanocomposite structure. In order to describe the nanocrystallization kinetics of the Al‐based glasses the analytical kinetic equations in the frames of Kolmogorov‐Johnson‐Mehl‐Avrami model have been proposed and the effective volume diffusion coefficient values which govern the diffusion‐limited growth nanocrystals have been determined. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Nanocrystallization of Al‐based glasses via nucleation and growth under “soft impingement” conditions

Rassolov

Tkatch

Maslov³

et al. 2010

Phys. Status Solidi (c)

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“…In order to simplify description of the diffusion-limited growth of crystals accounting the diffusion fields an attempt to obtain the approximate solution of the problem solved by Ham (Fig. 18) has been recently made [39]. Fig.…”

Section: Activity 25 Development Of Theoretical Models Of Nanocrystmentioning

confidence: 99%

“…18) the solution of the system of Eqs. (1) and (2) yields the approximate expression of the crystal radius change on time at the final stage of primary crystallization as [39] …”

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Development of High Strength Thermally Stable Al-based Alloys with Nanocomposite Structure

Maslov¹

2010

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)05-02-2010 REPORT TYPE Final Report DATES COVERED (From -To)01-Dec-06 -11-Jun-10 TITLE AND SUBTITLE PERFORMING ORGANIZATION REPORT NUMBERN/A SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)EOARD Unit 4515 BOX 14 APO AE 09421 SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S)STCU 06-8005 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTThis report results from a contract tasking Institute for Metal Physics, NAS of Ukraine as follows: The demands on materials set by aerospace and aircraft manufacturers include the development of alloys possessing high strength-to-weight ratios and capable to withstand high temperature exposures during service. One of the promising classes of materials which may meet these requirements are Al-based alloys with nanocomposite structures formed by partial crystallization of amorphous precursors the strength of which may exceed 1500 MPa. Solution of the problems concerning alloys chemistry and ability to tailor of certain microstructures is of prime importance for the development of new nanostructured materials. The goals of the project are to perform the systematic experimental studies of the effects of alloy composition and thermal prehistory on glassforming ability, thermal stability, crystallization behaviour and mechanical properties of a series binary, ternary and multicomponent Al-based alloys alloyed by transition metals and rare earths as well as to elaborate appropriate theoretical models of nanocrystallization processes. The main factors responsible for nanoscale microstructure formation will be determined from comparison of the experimental data with the model predictions.As a result a series of new Al-based alloys with nanocomposite structure with improved mechanical properties and enhanced thermal stability will be developed and the fundamental basis for the nanostructured alloys design will be created. SUBJECT TERMS

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An analytical model for secondary phase dissolution kinetics

et al. 2014

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Analytical description of isothermal primary crystallization kinetics of glasses: Fe85B15 amorphous alloy

Cited by 23 publications

References 26 publications

Nanocrystallization of Al‐based glasses via nucleation and growth under “soft impingement” conditions

Nanocrystallization of Al‐based glasses via nucleation and growth under “soft impingement” conditions

Development of High Strength Thermally Stable Al-based Alloys with Nanocomposite Structure

An analytical model for secondary phase dissolution kinetics

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