EVOLUTION OF NANOSCALE Al3(ZrxEr1-x) PRECIPITATES IN Al-6Mg-0.7Mn-0.1Zr-0.3Er ALLOY ALLOY DURING ANNEALING
Received date: 2010-01-19
Revised date: 2010-05-05
Online published: 2010-07-11
Supported by
Supported by High Technology Research and Development Program of China (Nos.2006AA03A207 and 2007AA03Z514)
Erbium (Er) has attracted considerable attention as a substitute to scandium (Sc) for microalloying. The solid solution of Er and Zr decomposes to form a dispersion of secondary Al3(ZrxEr1-x) during annealing. This secondary Al3(ZrxEr1-x) precipitates improve strength, especially the elevated temperature strength. In the present paper we investigate the evolution of Al3(ZrxEr1-x) precipitate during annealing by transmission electron microscopy (TEM). The Al3(ZrxEr1-x) precipitates nucleate homogeneously at lower temperatures (280℃ and 470 ℃). The transition from homogeneous to heterogeneous nucleation at higher aging temperature (510℃) is a natural consequence of the reduced driving force for nucleus formation as the temperature increases and the Er supersaturation in the α-Al matrix decreases. The change in morphology of the Al3(ZrxEr1-x) precipitates from faceted to approximately spheroidal is associated with a change in the value of interfacial free energies. The diameter and the ratio of Zr/Er increase with increasing aging time at constant temperature. The coarsening of Al3(ZrxEr1-x) is dependent on the diffusivity of Er, Zr in α-Al.
Key words： annealing; Al3(ZrxEr1-x); coarsening
GONG Bo , ZHE Zuo-Ren , HUANG Hui , WEN Qing-Beng . EVOLUTION OF NANOSCALE Al3(ZrxEr1-x) PRECIPITATES IN Al-6Mg-0.7Mn-0.1Zr-0.3Er ALLOY ALLOY DURING ANNEALING[J]. Acta Metall Sin, 2010 , 46(7) : 850 -856 . DOI: 10.3724/SP.J.1037.2010.00036
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