Influence of Gd and Fe on crystallization of Al87Y5Ni8 amorphous alloy

Mika, Taras; Karolus, M.; Haneczok, G.; Bednarska, L.; Łągiewka, E.; Kotur, B.

doi:10.1016/j.jnoncrysol.2008.01.020

Cited by 25 publications

(28 citation statements)

References 22 publications

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“…All these values agree with those estimated for Al-based amorphous alloys (e.g. [15][16][17][18]) and are higher (except Al 90 Gd 10 ) than Q of self-diffusion in pure Al (17130 K) [19] which indicates that the first crystallization stage of Al-based amorphous alloys is governed by diffusion of the solute atoms (transition and rare earth metals). In view, that due to technological difficulties the structure of the Al 90 Gd 10 as prepared melt-spun ribbon was partially crystallized (Rep Qtrl_5) the value of Q 1 for this alloy may be underestimated.…”

Section: Activity 21 Studies Of Thermal Stability Of the Amorphous supporting

confidence: 85%

“…It should be noted that in contrast to the data of Ref. [15][16][17], there are no direct correlation between thermal stability of the amorphous phases and the activation energies of the first crystallization stage ( Table 2). The possible reason for this is differences in the mechanisms of the first crystallization stage in Al-based amorphous alloys with different chemical compositions and this problem has been considered below.…”

Section: Activity 21 Studies Of Thermal Stability Of the Amorphous contrasting

confidence: 63%

“…In the present study the crystallization onset temperature, T ons , determined at heating rate of 5 K/min ( [15][16][17]. Besides, the change of Ni/(Co,Fe) proportions from 3/1 to 1/3 leads to lowering of the number of crystallization stages from 3 (which is typical for the majority amorphous alloys studied) to 2 ( Fig.…”

Section: Activity 21 Studies Of Thermal Stability Of the Amorphous mentioning

confidence: 72%

“…3c). The values of the onset crystallization temperatures summarized in Table 1 ) and are rather high in comparison with those reported in literature for Al-based amorphous alloys (e.g., [15][16][17][18]. The continuous heating experiments at rates of 5, 10, 20 and 40 K/min were used to determine the activation energy of the first crystallization stage, Q 1 , which is a useful parameter of the crystallization process.…”

Section: Activity 21 Studies Of Thermal Stability Of the Amorphous mentioning

confidence: 84%

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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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Section: Activity 21 Studies Of Thermal Stability Of the Amorphous supporting

confidence: 85%

Section: Activity 21 Studies Of Thermal Stability Of the Amorphous contrasting

confidence: 63%

Section: Activity 21 Studies Of Thermal Stability Of the Amorphous mentioning

confidence: 72%

Section: Activity 21 Studies Of Thermal Stability Of the Amorphous mentioning

confidence: 84%

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

Maslov¹

2010

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“…4. The juvenile electrodes are characterized by amorphous structures: a halo for 2θ = 40° [13][14][15]. Two small premaxima detected within the range 2θ = 10°-20° correspond to the grouping of clusters in the amorphous matrix [13,16].…”

Section: Table 1 Currents (I Corr ) and Potentials (E Corr ) Of Ama mentioning

confidence: 99%

Electrodes Based on Amorphous Metallic Aluminum Alloys in the Reactions of Hydrogen Release

et al. 2016

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in alkaline solutions of potassium hydroxide of different concentrations and the influence of partial substitution of 1 at. % Gd or Dy for Y. It is shown that all investigated specimens are corrosion-resistant in the course of cyclic polarization within the potential range from -1.2 to + 1.0 V in aqueous KОН solutions of various concentrations (0.5-5.0) М. It is shown that AMA electrodes alloyed with 1 at.% Dy exhibit the highest catalytic activity in a 4 М KОН solution.The synthesis and accumulation of hydrogen by metallic alloys and carbon-containing materials is a promising and extensively investigated scientific problem. The electrochemical synthesis of hydrogen can be controlled by changing the elemental composition of the electrodes, concentration of electrolytes, and the temperature of the electrochemical system [1-7]. The amorphous metallic alloys (AMA) exhibiting high corrosion resistance within a broad range of рН values are of especial interest as catalysts of hydrogen release. It is also important to study the accumulation of hydrogen on the cathode accompanied by the formation of metal hydrides.The properties of the AMA are determined by the nature of the base metal and by the composition of alloying admixtures [7][8][9]. Thus, changing the elemental composition of AMA, one can extend the field of their applicability. Amorphous alloys based on aluminum are used as corrosion-resistant coatings and structural materials. The AMA are corrosion-resistant in media whose рН value is close to neutral but electrodes based on Аl dissolve in strong alkaline and acidic aqueous solutions as a result of which hydrogen is released [9]:The amorphous metallic alloys based on aluminum and alloyed with transition and rare-earth metals (REM) exhibit their catalytic action in various redox processes, preserving at the same time their high corrosion resistance [8,9]. It is known that the high corrosion resistance in various media is guaranteed by the transition of

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Numerical analysis of superparamagnetic clusters distribution

Chrobak

Haneczok

Chełkowska

et al. 2011

Physica Status Solidi (a)

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The paper concerns numerical analysis of superparamagnetic clusters by means of Langevin paramagnetism theory and simulated annealing (SA) procedure supplemented with some additional constraints. In order to determine a proper calculation algorithm and its parameters the three methods, i.e., simple SA, SA with maximum entropy, and SA with local maximum entropy were tested. Within the analyzed SA procedures (carried out for the computer generated semi-empirical curves) the best results were obtained by making use of the local entropy constraint. It was also shown that this algorithm can be successfully applied to determination of superparamagnetic cluster distribution. The tested SA procedure was applied to analysis of measured magnetic isotherms for Al-RE-Ni amorphous alloys and thin SiC-Mn layers deposited on a Si substrate.

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Influence of Gd and Fe on crystallization of Al87Y5Ni8 amorphous alloy

Cited by 25 publications

References 22 publications

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

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

Electrodes Based on Amorphous Metallic Aluminum Alloys in the Reactions of Hydrogen Release

Numerical analysis of superparamagnetic clusters distribution

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