The Microstructures and Tensile Properties of As-Extruded Mg–4Sm–xZn–0.5Zr (x = 0, 1, 2, 3, 4 wt %) Alloys
Abstract
:1. Introduction
2. Experimental Procedure
3. Results and Discussion
3.1. Microstructure of As-Cast Alloys
3.2. Microstructures of Solution-Treated Alloys
3.3. Microstructures of As-Extruded Alloys
3.4. Mechanical Properties
3.5. Fracture
4. Conclusions
- (1)
- The as-cast Mg–4Sm–0.5Zr alloys contains α-Mg matrix and Mg41Sm5 phase. The microstructures of as-cast Mg–4Sm–xZn–0.5Zr (x = 1, 2, 3, 4 wt %) alloys mainly consist of α-Mg matrix, Mg41Sm5 and (Mg,Zn)3Sm.
- (2)
- The as-cast Mg–4Sm–2Zn–0.5Zr alloy exhibits the best comprehensive tensile properties at room temperature among all the as-cast alloys, and YS, UTS and EL are 132 MPa, 175 MPa and 8.7%, respectively.
- (3)
- f Besides the block-shaped precipitates, some disc-like precipitates also are observed in the as-ex elongation are about 246 MPa, 273 MPa and 21%, respectively, which is attributed to the massive dispersed nanoscale particles effectively reducing the DRXed grain size and blocking slip of dislocation. The dynamic precipitates in as-extruded Mg–4Sm–4Zn–0.5Zr alloy containing basal precipitates having a hexagonal structure with a = 0.556 nm.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Nominal Alloys | Composition (wt %) | |||
---|---|---|---|---|
Mg–4Sm–xZn–0.5Zr | Mg | Sm | Zn | Zr |
Mg–4Sm–0.5Zr | Balance | 3.50 | - | 0.40 |
Mg–4Sm–1Zn–0.5Zr | Balance | 3.74 | 0.82 | 0.40 |
Mg–4Sm–2Zn–0.5Zr | Balance | 4.06 | 1.80 | 0.51 |
Mg–4Sm–3Zn–0.5Zr | Balance | 4.21 | 2.79 | 0.60 |
Mg–4Sm–4Zn–0.5Zr | Balance | 4.10 | 3.67 | 0.40 |
Position | Elements | ||||
---|---|---|---|---|---|
Mg K | Sm L | Zn K | Zr L | ||
Point A | Wt % | 53.53 | 43.61 | - | 2.86 |
At % | 87.27 | 11.49 | - | 1.24 | |
Point D | Wt % | 47.78 | 26.13 | 23.29 | 2.79 |
At % | 77.81 | 6.88 | 14.10 | 1.21 |
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Che, C.; Cai, Z.; Cheng, L.; Meng, F.; Yang, Z. The Microstructures and Tensile Properties of As-Extruded Mg–4Sm–xZn–0.5Zr (x = 0, 1, 2, 3, 4 wt %) Alloys. Metals 2017, 7, 281. https://doi.org/10.3390/met7070281
Che C, Cai Z, Cheng L, Meng F, Yang Z. The Microstructures and Tensile Properties of As-Extruded Mg–4Sm–xZn–0.5Zr (x = 0, 1, 2, 3, 4 wt %) Alloys. Metals. 2017; 7(7):281. https://doi.org/10.3390/met7070281
Chicago/Turabian StyleChe, Chaojie, Zhongyi Cai, Liren Cheng, Fanxing Meng, and Zhen Yang. 2017. "The Microstructures and Tensile Properties of As-Extruded Mg–4Sm–xZn–0.5Zr (x = 0, 1, 2, 3, 4 wt %) Alloys" Metals 7, no. 7: 281. https://doi.org/10.3390/met7070281