The difference in devitrification paths in Al87Ni7Sm6 and Al87Ni7La6 amorphous alloys

Battezzati, Livio; Rizzi, Paola; Rontó, Viktória

doi:10.1016/j.msea.2003.10.042

Cited by 24 publications

(24 citation statements)

References 8 publications

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“…2). It indicates that crystallization of the amorphous Al 90 Y 10 alloy is multi-stage process which is typical for Al-based glasses [8,9]. It should be noted that as it has been shown in [8] the resistometry scan of the Al 85 Ni 5 Y 8 Co 2 glass not only well agrees with the DSC thermogram, but is more sensitive for the detection of the phase transformations.…”

Section: Methods Assumptions and Proceduressupporting

confidence: 66%

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: Methods Assumptions and Proceduressupporting

confidence: 66%

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

Maslov¹

2010

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“…The activation energy for crystallization of amorphous solids can be expressed as a sum of the nucleation and growth activation energies: E a ¼ aE n þbE g , where a and b are positive constants related to Avrami exponent n and a þ b ¼ 1 [35,36]. Previous experimental results suggested that the nucleation activation energy was much smaller than the growth activation energy in Al-based amorphous alloys [17]. For the alloy with more than 5 at.% La, the nucleation process is almost completed on the start of the isothermal annealing, and then the crystallization process is controlled by the growth of the crystallites.…”

Section: Crystallization Process In Aleniela Amorphous Alloysmentioning

confidence: 99%

Effects of La content on the glass transition and crystallization process of Al–Ni–La amorphous alloys

Huang¹,

Jiangkao²,

Rao³

et al. 2007

Intermetallics

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“…Among the Al-based amorphous alloys, the crystallization behaviors of Al-Ni-La have been found to be strongly dependent on the compositions [9][10][11][12]. For example, as the Ni content in Al 85þx Ni 9Àx La 6 (x ¼ 0-6) amorphous alloys increases, the primary phase changes from fcc-Al plus metastable bcc-(AlNi) 11 La 3 -like phase at x ¼ 2-6 to single unidentified metastable phase at x ¼ 0 (see Table 1).…”

Section: Introductionmentioning

confidence: 99%

“…For example, as the Ni content in Al 85þx Ni 9Àx La 6 (x ¼ 0-6) amorphous alloys increases, the primary phase changes from fcc-Al plus metastable bcc-(AlNi) 11 La 3 -like phase at x ¼ 2-6 to single unidentified metastable phase at x ¼ 0 (see Table 1). Single fcc-Al is not obtained in the entire Ni content range, but is precipitated from Al 86 Ni 9 La 5 and Al 87 Ni 8 La 5 amorphous alloys.…”

Section: Introductionmentioning

confidence: 99%

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

Huang

Rao

et al. 2008

Intermetallics

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The difference in devitrification paths in Al87Ni7Sm6 and Al87Ni7La6 amorphous alloys

Cited by 24 publications

References 8 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

Effects of La content on the glass transition and crystallization process of Al–Ni–La amorphous alloys

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

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