Effects of Y content and temperature on the damping capacity of extruded Mg-Y sheets
| Autor: | Yingbo Zhang, Hao Zhou, W. Yang, Dongdi Yin, Y.T. Tang, G.H. Huang, C. Zhang, Lingbao Ren |
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| Rok vydání: | 2019 |
| Předmět: |
lcsh:TN1-997
010302 applied physics Materials science Strain (chemistry) Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Damping capacity Mechanics of Materials 0103 physical sciences Grain boundary Composite material Dislocation 0210 nano-technology lcsh:Mining engineering. Metallurgy Grain Boundary Sliding |
| Zdroj: | Journal of Magnesium and Alloys, Vol 7, Iss 3, Pp 522-528 (2019) |
| ISSN: | 2213-9567 |
| DOI: | 10.1016/j.jma.2019.05.003 |
| Popis: | The damping behavior of extruded Mg-xY (x = 0.5, 1.0, 3.0 wt.%) sheets were investigated in detail concerning the effects of Y addition and temperature, and the relationship between damping capacity and yield strength was discussed. At room temperature (RT), with Y content increasing from 0.5% to 3.0%, the damping capacity (Q−1) significantly decreased from 0.037 to 0.015. For all the studied sheets, the relationship between strain amplitude and Q−1 fitted well with the Granato and Lücke (G-L) dislocation damping model. With temperature increased, the G-L plots deviated from linearity indicating that the dislocation damping was not the only dominate mechanism, and the grain boundary sliding (GBS) could contribute to damping capacity. Consequently, the Q−1 increased remarkably above the critical temperature, and the critical temperature increased significantly from 50 °C to 290 °C with increasing Y contents from 0 to 3.0 wt.%. This result implied that the segregation of Y solutes at grain boundary could depress the GBS, which was consistent with the recent finding of segregation tendency for rare-earth solutes. The extruded Mg-1Y sheet exhibited slightly higher yield strength (Rp0.2) and Q−1 comparing with high-damping Mg-0.6Zr at RT. At an elevated temperature of 325 °C, the Mg-1Y sheet had similar Q−1 but over 3 times larger Rp0.2 than that of the pure Mg. The present study indicated that the extruded Mg-Y based alloys exhibited promising potential for developing high-performance damping alloys, especially for the elevated-temperature application. Keywords: Extruded sheets, Mg-Y alloys, Damping capacity, Granato and Lücke model, Elevated temperature |
| Databáze: | OpenAIRE |
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