Hot compressive deformation behavior and electron backscattering diffraction analysis of Mg95.50Zn3.71Y0.79 fine-grained alloy solidified under high pressure

• Published in: Journal of materials science Vol. 53; no. 4; pp. 2880 - 2891
• Main Authors: Zhibin, Fan, Xiaoping, Lin, Yun, Dong, Rui, Xu, Lin, Wang
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2018; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Compression tests; Crystallography and Scattering Methods; Deformation; Dislocation density; Dynamic recrystallization; Electron backscatter diffraction; Grain size; Materials Science; Metals; Polymer Sciences; Rheological properties; Slip; Solid Mechanics; Solidification; Strain rate; True strain; True stress; Electron Backscatter Diffraction (EBSD); Solidified Alloy; High-pressure Setting; EBSD Analysis; Basal Slip
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-017-1698-x

An Mg 95.50 Zn 3.71 Y 0.79 fine-grained solidified alloy with a grain size of 16 μm was prepared by high-pressure solidification. The microstructure characteristics and hot compressive deformation behavior of the alloy solidified under high pressure were compared with the atmospheric-pressure solidified alloy by carrying out the unilateral compression tests under a strain rate in the range of 0.001–1.0 s −1 and at a deformation temperature in the range of 523–573 K. The true stress-true strain curve of the high-pressure solidified alloy shows the typical dynamic recrystallization rheological curve. EBSD results show that when the deformation was carried out at 573 K, nearly 90% dynamic recrystallization occurred in the high-pressure solidified alloy, and the newly formed grains were distortionless and had low dislocation density. The high-pressure solidified alloy showed a double-peak basal texture at a strain rate of 1.0 s −1 . The two peak points showed a maximum pole density of 9.88 and 7.91, less than that in atmospheric-pressure alloy. When the deformation was carried out at the following conditions: deformation temperature = 573 K, strain rate = 0.001, and true strain = 0.9, the average Schmid factor (SF) for basal slip of the grains in the high-pressure solidified alloy was 0.419, and SF value for basal slip in 91% grains was greater than 0.3.