Solid-state transformation of iron-rich intermetallic phases in Al-Cu 206 cast alloys during solution heat treatment

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DOIResolve DOI: http://doi.org/10.1007/s11661-013-1726-7
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TypeArticle
Journal titleMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
ISSN1073-5623
Volume44
Issue8
Pages34943503; # of pages: 10
SubjectChinese script; D. transmission electron microscopes (TEM); Differential scanning calorimeters; Electron back-scattered diffraction; Intermetallic phasis; Normal solutions; Solid state transformations; Solution heat treatment; Alloys; Aluminum; Cast iron; Copper alloys; Differential scanning calorimetry; Heat treatment; Scanning electron microscopy; Transmission electron microscopy; Iron alloys
AbstractThe solid-state transformation of the iron-rich intermetallic phases in Al-Cu 206 cast alloys during the solution heat treatment was studied by using Scanning Electron Microscope (SEM), Electron Back Scattered Diffraction (EBSD), Differential Scanning Calorimeter (DSC), and Transmission Electron Microscope (TEM). At a normal solution treatment temperature of 793 K (520 C), no visible variation is observed for the β-Fe phase solidified from the Al alloy melt. With increasing soaking time, however, the Chinese script α-Fe becomes unstable and progressively transforms into platelet β-Fe, termed as solid-state-transformed (STed) β-Fe to distinguish it from the β-Fe directly solidified from the Al alloy melt. The STed β-Fe preferentially nucleates on the α-Fe and then grows from the α-Fe/Al interface into α-Fe and/or Al matrix with a much higher growth rate in the α-Fe. The incomplete solid-state transformation from α-Fe into STed β-Fe leads to the fragmentation of the α-Fe. The formation of the STed β-Fe with increasing size and volume fraction after longer soaking time can deteriorate the tensile properties. © 2013 The Minerals, Metals & Materials Society and ASM International.
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LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21269839
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Record identifier24c2cc69-87ea-4454-977a-45074c82f440
Record created2013-12-13
Record modified2016-05-09
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