期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 528, 期 13-14, 页码 4500-4506出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.02.048
关键词
Hardness; Heterogeneity; High-pressure torsion; Magnesium alloys; Shear bands
类别
资金
- National Science Foundation of the United States [DMR-0855009]
An investigation was conducted on a magnesium AZ31 alloy to determine whether the deformation process is homogeneous or heterogeneous during high-pressure torsion (HPT). Disks were processed by HPT at a temperature of 463 K for up to 5 turns and then sectioned vertically across the diameters in order to examine the grain size distributions and the microhardness values on the cross-sectional planes. The results show that deformation is not homogeneous in the through-thickness direction during processing by HPT. The variations in grain size, and therefore in hardness, are due in part to the different grain refinement mechanism that occurs in hcp magnesium alloy by comparison with fcc aluminum. Shear bands were also observed in these samples and they confirm the heterogeneity of the deformation. The heterogeneous nature of flow in HPT processing is probably associated with local variations in the flow stress of the samples during processing. (C) 2011 Elsevier B.V. All rights reserved.
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