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High Temperature Creep of an Al-8,5Fe-1,3V-1,7Si Alloy
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SYSNO ASEP 0177983 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title High Temperature Creep of an Al-8,5Fe-1,3V-1,7Si Alloy Author(s) Kuchařová, Květa (UFM-A) RID, ORCID
Zhu, S. J. (CN)
Čadek, Josef (UFM-A)Source Title Kovové materiály. - : Ústav fyziky materiálu AV ČR, v. v. i. - : Ústav materiálov a mechaniky strojov SAV. - : Ústav materiálového výskumu SAV. - : Strojnícka fakulta STU - ISSN 0023-432X
Roč. 40, č. 2 (2002), s. 69-84Number of pages 16 s. Language eng - English Country SK - Slovakia Keywords Al-8,5Fe 1,3V 1,7Si alloy ; creep behavior, true threshold stress Subject RIV JI - Composite Materials R&D Projects IBS2041001 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z2041904 - UFM-A Annotation A previous investigation of creep behavior in an Al-8.5Fe-1.3V-1.7Si (8009AI type) alloy processed by rapid solidification and strengthened with small incoherent Al-12 (Fe,V)(3)Si phase particles, is extended to temperatures ranging from 773 to 923 K using the isothermal constant-stress-creep test technique. While in the temperature interval 623-723 K the creep behavior of the alloy is associated with the true threshold stress, at 773-923 K the true threshold stress is absent: the apparent stress exponent of minimum creep strain rate, m,, decreases with decreasing applied stress. Assuming a temperature independent value of the relaxation factor k(R) characterizing the strength of attractive dislocation/Al-12(Fe,V)(3)Si particle interaction, an attempt is made to interpret the minimum creep strain rate behavior in terms of the Rosler-Arzt model. The structure factor C following from the fitting procedure differs from that calculated from the structure data by a factor in average equal to 60. The activation energy of detachment of dislocations from interacting Al-12(Fe,V)(3)Si phase particles, following from the experimental creep data analysis, differs from that predicted by the model by a factor in average equal to 1.33. Thus, the thermally activated detachment of dislocations from the fine incoherent (interacting) particles is identified as the creep strain rate controlling process. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2003
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