Tension–Compression Asymmetry Improved by Cold Extrusion in Pure Magnesium

Journal Article · Mon Oct 15 04:00:00 EDT 2018 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3631-0· OSTI ID:22863247

Li, Cheng-jie; Cheng, Shuang ^[1]; Sun, Hong-fei; Bai, Gui-chao; Fang, Wen-bin ^[2]

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1. China Academy of Engineering Physics, Institute of Materials (China)
2. Harbin Institute of Technology, School of Materials Science and Engineering (China)

In this paper, cold extrusion was successfully used to fabricate the fine-grained pure Mg bar with average grain size of 2.5 μm. The microstructure, texture and mechanical properties were evaluated by electron backscattering diffraction and mechanical test. The results showed that the corresponding yield strengths for as-extruded fine-grained pure Mg were 130.8 MPa in tension and 125.6 MPa in compression, leading to a greatly improved yield asymmetry ratio. The improvement in tension–compression asymmetry is mainly due to grain refinement which favors the suppression of deformation twinning in compression and promotion of multi-deformation modes both in tension and compression at small strains.

• OSTI ID: 22863247
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 10 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ASYMMETRY
DEFORMATION
ELECTRON DIFFRACTION
EXTRUSION
GRAIN REFINEMENT
GRAIN SIZE
MAGNESIUM
MECHANICAL TESTS
PRESSURE RANGE MEGA PA 100-1000
YIELD STRENGTH