Effects of Zn on Microstructure and Mechanical Properties of As-cast Mg-Y-Nd-Zr Alloys
Effects of Zn on microstructure and mechanical properties of Mg-Y-Nd-Zr as-cast alloys were investigated by the optical microscopy(OM), scanning electron microscopy(SEM), X-ray diffractometry(XRD) and the mechanical properties test. The results show that the grain size of Mg-Y-Nd-Zr-<i>x</i...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2017-09-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/Y2017/V45/I9/116 |
| Summary: | Effects of Zn on microstructure and mechanical properties of Mg-Y-Nd-Zr as-cast alloys were investigated by the optical microscopy(OM), scanning electron microscopy(SEM), X-ray diffractometry(XRD) and the mechanical properties test. The results show that the grain size of Mg-Y-Nd-Zr-<i>x</i>Zn(<i>x</i>=0.0%, 0.5%, 1.0%, 1.5%,mass fraction)alloys is greatly refined with the increase of Zn content, which is refined from (57±0.8)μm to (30±0.3)μm. The volume fraction of eutectic structure at grain boundary increases gradually. Mg<sub>12</sub>Nd phase and Mg<sub>24</sub>Y<sub>5</sub> phase exist mainly in Mg-Y-Nd-Zr as-cast alloy. With the addition of 0.5%Zn, Mg<sub>12</sub>YZn phase appears at the grain boundary. With the increase of Zn, the volume fraction of Mg<sub>12</sub>YZn phase and the mechanical properties of the alloys increases gradually. The alloy containing 1.0%Zn exhibits the optimal mechanical properties, the ultimate tensile strength, yield strength and elongation are (208±5.9), (159±3.9)MPa and (7.5±0.2)%, respectively; comparing with the alloy without the addition of Zn, the ultimate tensile strength, yield strength and elongation increase by 18, 42MPa and 1.2%. |
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| ISSN: | 1001-4381 1001-4381 |