Developing superplasticity and a deformation mechanism map for the Zn-Al eutectoid alloy processed by high-pressure torsion

作者：Kawasaki Megumi^*; Langdon Terence G

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2011, 528(19-20): 6140-6145.

DOI：10.1016/j.msea.2011.04.053

• Deformation mechanism maps
• Flow mechanisms
• High-pressure torsion
• Superplasticity
• Ultrafine grains

A Zn-22% Al eutectoid alloy was processed by high-pressure torsion (HPT) for 1.3 and 5 turns at room temperature to produce an ultrafine grain size of similar to 350 nm. Tensile testing at a temperature of 473 K gave excellent superplastic properties with elongations to failure up to a maximum of 1800% at an imposed strain rate of 1.0 x 10(-1) s(-1): this is within the range of high strain rate superplasticity and represents the highest elongation recorded to date for a specimen processed by HPT. It is shown that the experimental data are in excellent agreement with a deformation mechanism map constructed for a temperature of 473 K.

• 出版日期2011-7-25