期刊
MATERIALS TRANSACTIONS
卷 49, 期 1, 页码 76-83出版社
JAPAN INST METALS
DOI: 10.2320/matertrans.ME200718
关键词
hardness; high-pressure torsion; magnesium alloy; superplasticity; ultrafine grains
Experiments were conducted on an AZ61 magnesium alloy to evaluate the microstructural characteristics and the mechanical properties after processing by High-Pressure Torsion (HPT). The results show that processing by HPT produces excellent grain refinement with average grain sizes of similar to 0.22 and similar to 0.11 mu m after processing at 423 K and room temperature, respectively. Tensile testing after HPT revealed the potential for achieving superplastic elongations with a maximum recorded elongation of 620% when testing at a temperature of 473 K. Using microhardness measurements, it is demonstrated that the the microstructure gradually evolves with increasing torsional straining in HPT so that ultimately there is a reasonably homogeneous structure across the disk.
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