Effect of precipitates on microstructural evolution of 7050 Al alloy sheet during equal channel angular rolling

Microstructural evolution during equal channel angular rolling (ECAR) is investigated in a 7050 Al alloy sheet that includes two types of precipitates, large plate-type MgZn 2 and fine spherical Al 3Zr. With increasing number of ECAR passes, gradual fragmentation of MgZn 2 precipitates and subsequen...

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Veröffentlicht in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2003-04, Vol.347 (1), p.253-257
Hauptverfasser:	Nam, C.Y, Han, J.H, Chung, Y.H, Shin, M.C
Format:	Artikel
Sprache:	eng
Schlagworte:	7050 Al alloy Cross-disciplinary physics: materials science rheology Equal channel angular rolling Exact sciences and technology Grain refinement Materials science Other heat and thermomechanical treatments Physics Precipitate Treatment of materials and its effects on microstructure and properties
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Zusammenfassung:	Microstructural evolution during equal channel angular rolling (ECAR) is investigated in a 7050 Al alloy sheet that includes two types of precipitates, large plate-type MgZn 2 and fine spherical Al 3Zr. With increasing number of ECAR passes, gradual fragmentation of MgZn 2 precipitates and subsequent grain refinement are revealed by transmission electron microscopy. After 6 passes of ECAR, the sheet's grain size decreases to ∼600 nm and most large plate-type MgZn 2 precipitates are fragmented into fine spherical particles. Roles of the two types of precipitates on the evolution of fine-grained structure are discussed.
ISSN:	0921-5093 1873-4936
DOI:	10.1016/S0921-5093(02)00597-X