Effect of Y for enhanced age hardening response and mechanical properties of Mg–Gd–Y–Zr alloys

In this study, compositional dependence of age hardening response and tensile properties were investigated for Mg–10Gd– xY–0.4Zr ( x = 1, 3, 5 wt.%) alloys. With increasing Y content, the age hardening response of the alloys enhanced and tensile properties increased. The Mg–10Gd–5Y–0.4Zr alloy exhib...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2007-05, Vol.456 (1), p.78-84
Main Authors: Wang, Jun, Meng, Jian, Zhang, Deping, Tang, Dingxiang
Format: Article
Language:English
Subjects:
Ageing
Applied sciences
Cross-disciplinary physics: materials science
rheology
Elasticity. Plasticity
Exact sciences and technology
Magnesium alloy
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Mg–Gd–Y–Zr
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitation
Precipitation hardening
Solid solution, precipitation, and dispersion hardening
aging
Treatment of materials and its effects on microstructure and properties
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Summary:In this study, compositional dependence of age hardening response and tensile properties were investigated for Mg–10Gd– xY–0.4Zr ( x = 1, 3, 5 wt.%) alloys. With increasing Y content, the age hardening response of the alloys enhanced and tensile properties increased. The Mg–10Gd–5Y–0.4Zr alloy exhibited maximum tensile strength and yield strength at aged-peak hardness, and the values were 302 MPa and 289 MPa at room temperature, and 340 MPa and 267 MPa at 250 °C, respectively. The strong peak age hardening was attributed to the precipitation of prismatic β′ plates in a triangular arrangement. The cubic shaped β phase was also observed at grain boundaries. The remarkable improvement in strength is associated with a uniform and high dense distribution of β′ and cubic shaped β precipitate phases in Mg matrix. Elongation of Mg–10Gd–0.4Zr alloys decreased with increasing Y content, and the elongation of Mg–10Gd–5Y–0.4Zr alloy was less than 3% below 250 °C, whereas the alloys containing 1 wt.% and 3 wt.% Y exhibited higher elongation than 5% at room temperature.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2006.11.096