Microstructure and mechanical properties of Mg–3.0Y–2.5Nd–1.0Gd–xZn–0.5Zr alloys produced by metallic and sand mold casting
| Autor: | Zhankui Gao, Liang Zhang, Guohua Wu, Haohao Zhang, Yushi Chen, Antao Chen, Quan Wang, Wendong Cui |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metallurgy 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure medicine.disease_cause 01 natural sciences Casting Grain size Solid solution strengthening Mechanics of Materials Mold 0103 physical sciences Ultimate tensile strength medicine General Materials Science Elongation Composite material 0210 nano-technology Eutectic system |
| Zdroj: | Journal of Materials Research. 32:3191-3201 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.2017.302 |
| Popis: | Mg–3.0Y–2.5Nd–1.0Gd–x Zn–0.5Zr (x = 0, 0.2, 0.5, and 1.0) (wt%) alloys were produced by metallic and sand mold casting to study the microstructure and mechanical properties of the alloys. The as-cast Zn-free alloys consist of α-Mg and eutectics, whereas the Zn-containing alloys contain additional long-period stacking ordered (LPSO) structures. With a higher solidification, the cooling rate brought by metallic mold casting, grains, and eutectics are refined, which enhances the elongation of the alloys, accompanied by a decrease of area fraction of the LPSO structure. Some residual eutectics in the Mg–3.0Y–2.5Nd–1.0Gd–1.0Zn–0.5Zr alloys act as obstacles to grain boundary migration during solution treatment, which make the average grain size 15–20 μm smaller than that of the other alloys and hence improve the elongation of the alloys. The Zn addition brings notable enhancements to mechanical properties of the alloys due to solid solution strengthening of Zn. Especially, the peak-aged Mg–3.0Y–2.5Nd–1.0Gd–0.5Zn–0.5Zr alloys perform with the highest overall tensile properties. |
| Databáze: | OpenAIRE |
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