Microstructural evolution of Mg-4%Nd alloy processed by high-pressure torsion
Bai, J., Xue, F., Alhajeri, Saleh N. and Langdon, Terence G. (2011) Microstructural evolution of Mg-4%Nd alloy processed by high-pressure torsion. Materials Science Forum, 667-669, 391-396. (doi:10.4028/www.scientific.net/MSF).
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Disks of as-extruded Mg-4Nd alloy were processed by high-pressure torsion (HPT) through ¼ to 5 turns at room temperature. The first 1/4 turn of HPT induces large numbers of twins and some dislocation tangles in the center region of the disk. With increase of torsional straining, the twinning is inhibited gradually and the dislocation density increases relating to the formation of dislocation substructures and ultimately transforming to high fractions of equiaxed gains which have an average grain size of ~200 nm and high-angle boundaries. HPT significantly improves the values of microhardness of this alloy. The hardness values in both the central and edge regions show a sharp rise after HPT for 1/4 turn and exhibit nearly saturation after 1/2 turn although there is a trend of a slight increase with increasing numbers of turns. The experimental results suggest more homogeneous microstructures may be produced by larger numbers of turns in the HPT process.
|Subjects:||T Technology > TP Chemical technology|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
|Date Deposited:||17 May 2011 13:17|
|Last Modified:||02 Mar 2012 11:55|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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