EVOLUTION OF NANOSCALE Al3(ZrxEr1-x) PRECIPITATES IN Al-6Mg-0.7Mn-0.1Zr-0.3Er ALLOY ALLOY DURING ANNEALING

doi:10.3724/SP.J.1037.2010.00036

Acta Metall Sin

2010, Vol. 46

Issue (7): 850-856 DOI: 10.3724/SP.J.1037.2010.00036

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EVOLUTION OF NANOSCALE Al₃(Zr_xEr_1-x) PRECIPITATES IN Al-6Mg-0.7Mn-0.1Zr-0.3Er ALLOY ALLOY DURING ANNEALING

Gong Bo, WEN Shengping, HUANG Hui, NIE Zuoren

College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

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Gong Bo WEN Shengping HUANG Hui NIE Zuoren. EVOLUTION OF NANOSCALE Al₃(Zr_xEr_1-x) PRECIPITATES IN Al-6Mg-0.7Mn-0.1Zr-0.3Er ALLOY ALLOY DURING ANNEALING. Acta Metall Sin, 2010, 46(7): 850-856.

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Abstract

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(Zr_xEr_1-x) during annealing. This secondary Al₃(Zr_xEr_1-x) precipitates improve strength, especially the elevated temperature strength. In the present paper we investigate the evolution of Al₃(Zr_xEr_1-x) precipitate during annealing by transmission electron microscopy (TEM). The Al₃(Zr_xEr_1-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(Zr_xEr_1-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(Zr_xEr_1-x) is dependent on the diffusivity of Er, Zr in α-Al.

Key words: annealing Al₃(Zr_xEr_1-x) coarsening

Received: 19 January 2010

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Supported by High Technology Research and Development Program of China (Nos.2006AA03A207 and 2007AA03Z514)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00036 OR https://www.ams.org.cn/EN/Y2010/V46/I7/850

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