Journal
METALS
Volume 12, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/met12091456
Keywords
Mg-Gd-Y-Zr alloy; non-flammability; extrusion; microstructure; mechanical properties
Funding
- National Natural Science Foundation of China [51701060]
- Funding Project for Introduced Overseas Students of Hebei Province of China [C20190505]
- High-level Talent Funding Project of Hebei Province of China [100410]
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This paper introduces a series of newly designed alloy materials with potential applications in the aerospace field. Through research on the composition and process, a lightweight and high-strength material is obtained.
With the lightest green structural material for 21st century, a significant weight reduction effect was expected to solve the lightweight problem in aerospace and other fields. However, the material's poor mechanical properties and flammability limited its widely application in such fields. In this paper, the GWK series alloys (Mg-5.3Gd-4.11Y-0.13Zr, Mg-5.5Gd-4.22Y-0.19Zr, and Mg-5.46Gd-4.02Y-0.20Zr, in wt.%) were designed, and we explored the effect of alloy composition and process on the microstructure and properties of GWK series alloys subject to casting, homogenization, extrusion, ageing and ignition. The result show that Mg-5.3Gd-4.11Y-0.13Zr alloy after T4 treatment at 500 degrees C/6 h obtains an excellent solid solution effect. In addition, the aged alloy shows a good balance of mechanical properties, a tensile strength of 405 MPa, yield strength of 275 MPa, as well as elongation of 8.12%, and excellent non-flammability.
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