J. Mater. Sci. Technol. ›› 2020, Vol. 45: 117-124.DOI: 10.1016/j.jmst.2019.11.026
• Research Article • Previous Articles Next Articles
S.Z. Wu, X.G. Qiao, M.Y. Zheng*()
Received:
2019-09-18
Revised:
2019-10-22
Accepted:
2019-11-05
Published:
2020-05-15
Online:
2020-05-27
Contact:
M.Y. Zheng
S.Z. Wu, X.G. Qiao, M.Y. Zheng. Ultrahigh strength Mg-Y-Ni alloys obtained by regulating second phases[J]. J. Mater. Sci. Technol., 2020, 45: 117-124.
Alloys | Composition (at.%) | Composition (wt%) | Y/Ni ratio |
---|---|---|---|
Mg95Y3Ni2 | Mg95.1Y3.0Ni1.9 | Mg-9.8Y-4.2Ni | 1.5 |
Mg96Y2Ni2 | Mg96.1Y2.0Ni1.9 | Mg-6.7Y-4.3Ni | 1 |
Mg97Y1Ni2 | Mg96.9Y1.1Ni2.0 | Mg-3.7Y-4.6Ni | 0.5 |
Table 1 Chemical compositions of Mg-Y-Ni alloys.
Alloys | Composition (at.%) | Composition (wt%) | Y/Ni ratio |
---|---|---|---|
Mg95Y3Ni2 | Mg95.1Y3.0Ni1.9 | Mg-9.8Y-4.2Ni | 1.5 |
Mg96Y2Ni2 | Mg96.1Y2.0Ni1.9 | Mg-6.7Y-4.3Ni | 1 |
Mg97Y1Ni2 | Mg96.9Y1.1Ni2.0 | Mg-3.7Y-4.6Ni | 0.5 |
Fig. 3. (a) TEM bright field image and selected area electron diffraction pattern and (b) corresponding composition of 18R-LPSO in Mg95Y3Ni2 alloy; (c) TEM bright field image and selected area electron diffraction pattern and (d) corresponding composition of Mg2Ni phase in Mg97Y1Ni2 alloy; (e) TEM bright field image, (f) HADDF-STEM image and (g) elemental mappings of γ' phase in Mg96Y2Ni2 alloy.
Alloys | α-Mg | LPSO | Mg2Ni |
---|---|---|---|
Mg95Y3Ni2 | 40.6 | 59.4 | — |
Mg96Y2Ni2 | 47.8 | 50.3 | 1.9 |
Mg97Y1Ni2 | 65.9 | 30.0 | 4.1 |
Table 2 Volume fraction of the main phases in the as-cast Mg-Y-Ni alloys.
Alloys | α-Mg | LPSO | Mg2Ni |
---|---|---|---|
Mg95Y3Ni2 | 40.6 | 59.4 | — |
Mg96Y2Ni2 | 47.8 | 50.3 | 1.9 |
Mg97Y1Ni2 | 65.9 | 30.0 | 4.1 |
Alloys | Mg | Y | Ni |
---|---|---|---|
Mg95Y3Ni2 | 98.4 ± 0.3 | 1.2 ± 0.3 | 0.4 ± 0.1 |
Mg96Y2Ni2 | 98.5 ± 0.2 | 0.8 ± 0.1 | 0.7 ± 0.3 |
Mg97Y1Ni2 | 99.1 ± 0.4 | 0.4 ± 0.1 | 0.5 ± 0.2 |
Table 3 EDS analysis of the matrix by SEM mapping in the as-cast Mg-Y-Ni alloys (at.%).
Alloys | Mg | Y | Ni |
---|---|---|---|
Mg95Y3Ni2 | 98.4 ± 0.3 | 1.2 ± 0.3 | 0.4 ± 0.1 |
Mg96Y2Ni2 | 98.5 ± 0.2 | 0.8 ± 0.1 | 0.7 ± 0.3 |
Mg97Y1Ni2 | 99.1 ± 0.4 | 0.4 ± 0.1 | 0.5 ± 0.2 |
Fig. 4. SEM images of (a) Mg95Y3Ni2 alloy, (b) Mg96Y2Ni2 alloy and (c) Mg97Y1Ni2 alloy after preheating at 420 °C for 15 min; (d) TEM bright field image and the HADDF-STEM images of (e) γ' and (f) 18R-LPSO in Mg96Y2Ni2 alloy after preheating.
Fig. 5. SEM images of the as-extruded Mg-Y-Ni alloys with different Y/Ni atomic ratios along extrusion direction: (a) Mg95Y3Ni2 alloy; (b) Mg96Y2Ni2 alloy; (c) Mg97Y1Ni2 alloy.
Fig. 6. (a-c) IPF images and (d-i) inverse pole ?gures of as-extruded alloys along extrusion direction: (a, d, g) Mg95Y3Ni2 alloy; (b, e, h) Mg96Y2Ni2 alloy; (c, f, i) Mg97Y1Ni2 alloy; (d-f) non-DRXed + DRXed regions and (g-i) DRXed regions.
Alloys | α-Mg (%) | Non-DRXed (%) | DRXed (%) | DRX ratio (%) | Grain diameter (μm) |
---|---|---|---|---|---|
Mg95Y3Ni2 | 40.6 | 10.1 | 30.5 | 75.2 | 3.70 ± 1.36 |
Mg96Y2Ni2 | 47.8 | 23.1 | 24.7 | 51.7 | 0.67 ± 0.20 |
Mg97Y1Ni2 | 65.9 | 10.6 | 55.3 | 83.9 | 0.83 ± 0.46 |
Table 4 DRX ratio and DRXed grain size of as-extruded Mg-Y-Ni alloys.
Alloys | α-Mg (%) | Non-DRXed (%) | DRXed (%) | DRX ratio (%) | Grain diameter (μm) |
---|---|---|---|---|---|
Mg95Y3Ni2 | 40.6 | 10.1 | 30.5 | 75.2 | 3.70 ± 1.36 |
Mg96Y2Ni2 | 47.8 | 23.1 | 24.7 | 51.7 | 0.67 ± 0.20 |
Mg97Y1Ni2 | 65.9 | 10.6 | 55.3 | 83.9 | 0.83 ± 0.46 |
Fig. 7. SEM images observed from the position of (a-c) 10 mm and (d) 0 mm below the die-entrance of partially extruded alloys: (a) Mg95Y3Ni2 alloy; (b) Mg96Y2Ni2 alloy; (c, d) Mg97Y1Ni2 alloy.
Fig. 8. (a) Tensile stress-strain curves of the as-extruded Mg-Y-Ni alloys, (b) mechanical properties of the as-extruded Mg-Y-Ni alloys with decreasing Y/Ni atomic ratio and (c) comparison of tensile properties of the as-extruded Mg-Y-Ni alloys and other high strength Mg alloys containing RE.
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