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Effect of Zr addition on the aging behavior of A319 aluminum cast alloy
, Article Scripta Materialia ; Volume 52, Issue 4 , 2005 , Pages 253-257 ; 13596462 (ISSN) ; Mahmudi, R ; Khomamizadeh, F ; Sharif University of Technology
2005
Abstract
The structure, age hardening response, precipitate type and hardness of A319 cast aluminum alloy without and with zirconium addition were investigated. The as-solutionized and artificially-aged hardness values were higher for the Zr-containing alloy. This is believed to be a consequence of the precipitation of Al3Zr particles produced during sufficiently long solutionizing treatments. © 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved
Microstructural evolution in damaged IN738LC alloy during various steps of rejuvenation heat treatments
, Article Journal of Alloys and Compounds ; Volume 512, Issue 1 , January , 2012 , Pages 340-350 ; 09258388 (ISSN) ; Nategh, S ; Ekrami, A. A ; Sharif University of Technology
2012
Abstract
IN738LC is one of the superior nickel base superalloys utilized at high temperatures in aggressive environments. However, experiencing high temperatures and stresses during service causes microstructure deterioration and degradation of mechanical properties in this alloy. To restore the microstructure and mechanical properties of the degraded alloy, rejuvenation heat treatments can be considered. In this study, the evolution of microstructural features in a creep damaged IN738LC superalloy during different stages of rejuvenation heat treatment cycles was investigated. During solution treatment stage, dissolution of coarsened γ′ precipitates, grain boundary films and transition zone around...
Aging behavior of a 2024 Al alloy-SiCp composite
, Article Materials and Design ; Volume 31, Issue 5 , May , 2010 , Pages 2368-2374 ; 02641275 (ISSN) ; Seyed Reihani, S.M ; Sharif University of Technology
2010
Abstract
In the present research work the 2024 aluminum alloy was reinforced with SiC particles via powder metallurgy method. The effect of heat treatment conditions on artificial aging kinetics was investigated. The solution treatment of the composite sample and the unreinforced alloy was carried out at 495 °C for 1, 2 and 3 h followed by aging at 191 °C for various aging times between 1 and 10 h. The existence of SiC particles led to increasing the peak hardness of the alloy. The peak hardness of the composite sample took place at shorter times than that of the unreinforced alloy for the samples solution treated for 2 and 3 h, but took place at longer times for the samples solution treated for 1 h....