Effects of Nd Addition on the Microstructure and Mechanical Properties of Extruded Mg-6Gd-2.5Y-0.5Zr Alloy
- Central South University, School of Material Science and Engineering (China)
The microstructure, age-hardening behavior, mechanical properties and texture of extruded Mg-6Gd-2.5Y-0.5Zr alloys with various additions of Nd have been investigated through optical microscopy, x-ray diffraction, scanning electron microscopy, transmission electron microscopy, electron back-scattered diffraction, hardness and tensile tests. The results indicate that the number of second-phase particles in the as-extruded alloys increases (especially with the addition of 1.5 wt.% Nd), and the amount of the strengthening β′ phase in the peak-aged sample initially increases, and then decreases when the content of Nd increases above 1.0 wt.%. The precipitation of second-phase particles in the extrusion process weakens the age strengthening. The peak-aged Mg-6Gd-2.5Y-1Nd-0.5Zr alloy shows a maximum yield strength of 259 MPa and an ultimate tensile strength of 350 MPa, which can be attributed to the finely dispersed strengthening β′ phase. All as-extruded alloys exhibit that (0001) planes are aligned perpendicular to the extrusion direction, and the maximum intensity of the texture increases gradually with Nd addition.
- OSTI ID:
- 22860689
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 1 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AGE HARDENING
BACKSCATTERING
ELECTRON DIFFRACTION
EXTRUSION
GADOLINIUM COMPOUNDS
HARDNESS
MAGNESIUM ALLOYS
MICROSTRUCTURE
NEODYMIUM ADDITIONS
PEAKS
PRECIPITATION
PRESSURE RANGE MEGA PA 100-1000
SCANNING ELECTRON MICROSCOPY
TENSILE PROPERTIES
TEXTURE
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YIELD STRENGTH
YTTRIUM COMPOUNDS