Effects of replacing Ni by Co on the crystallization behaviors of Al–Ni–La amorphous alloys

Huang, Zhenghua; Li, J.F.; Rao, Qunli; Zhou, Yiyuan

doi:10.1016/j.intermet.2008.02.014

Cited by 18 publications

(10 citation statements)

References 18 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: 64%

“…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: 67%

“…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: 83%

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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: 64%

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

confidence: 67%

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

confidence: 83%

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

Maslov¹

2010

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“…It has been reported that many types of amorphous alloy powders can be consolidated into bulk forms via hot pressing [11], spark plasma sintering [12], extrusion [13], high pressure torsion [14] and equal channel angular extrusion [15]. However, since all these consolidation processes are performed at temperatures within the supercooled liquid region, a higher crystallization temperature and a wider supercooled liquid region or higher thermal stability are essential for the consolidation operation [16][17][18][19][20]. Accordingly, studies have been carried out recently to find suitable Al-based amorphous alloy powders for processing corresponding bulk amorphous alloys in our group.…”

Section: Introductionmentioning

confidence: 99%