J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (11): 1240-1248.DOI: 10.1016/j.jmst.2016.08.026
Special Issue: 2017-2018年Mg合金专题
• Orginal Article • Previous Articles Next Articles
Zhong Liping1, Peng Jian1,2(), Sun Song1, Wang Yongjian1, Lu Yun3, Pan Fusheng1,2
Received:
2016-05-14
Revised:
2016-06-07
Accepted:
2016-06-08
Online:
2017-11-20
Published:
2018-01-25
About author:
1 These two authors contributed equally to this paper.
Zhong Liping, Peng Jian, Sun Song, Wang Yongjian, Lu Yun, Pan Fusheng. Microstructure and Thermal Conductivity of As-Cast and As-Solutionized Mg-Rare Earth Binary Alloys[J]. J. Mater. Sci. Technol., 2017, 33(11): 1240-1248.
Nominal alloy | Composition (wt% (at.%)) | Solutionizing treatment | ||||
---|---|---|---|---|---|---|
Ce | Nd | Y | Gd | Mg | ||
Mg-0.2Ce | 0.16 (0.03) | - | - | - | Bal. | 500 °C × 24 h |
Mg-0.4Ce | 0.34 (0.06) | - | - | - | Bal. | |
Mg-0.6Ce | 0.60 (0.10) | - | - | - | Bal. | |
Mg-1.0Ce | 1.05 (0.18) | - | - | - | Bal. | |
Mg-1.5Ce | 1.35 (0.24) | - | - | - | Bal. | |
Mg-0.3Nd | - | 0.23 (0.04) | - | - | Bal. | 525 °C × 12 h |
Mg-0.6Nd | - | 0.60 (0.10) | - | - | Bal. | |
Mg-1.0Nd | - | 0.99 (0.17) | - | - | Bal. | |
Mg-2.0Nd | - | 2.00 (0.34) | - | - | Bal. | |
Mg-4.0Nd | - | 3.94 (0.69) | - | - | Bal. | |
Mg-1.0Y | - | - | 0.87 (0.24) | - | Bal. | 525 °C × 12 h |
Mg-2.0Y | - | - | 1.98 (0.55) | - | Bal. | |
Mg-3.0Y | - | - | 3.03 (0.85) | - | Bal. | |
Mg-5.0Y | - | - | 4.51 (1.28) | - | Bal. | |
Mg-6.0Y | - | - | 5.60 (1.60) | - | Bal. | |
Mg-1.0Gd | - | - | - | 0.93 (0.15) | Bal. | 525 °C × 24 h |
Mg-2.0Gd | - | - | - | 2.16 (0.34) | Bal. | |
Mg-4.0Gd | - | - | - | 3.90 (0.62) | Bal. | |
Mg-6.0Gd | - | - | - | 5.36 (0.87) | Bal. | |
Mg-8.0Gd | - | - | - | 8.14 (1.35) | Bal. | |
Mg-10.0Gd | - | - | - | 9.20 (1.54) | Bal. |
Table 1 Compositions of Mg-RE binary alloys and the specific solutionizing treatment
Nominal alloy | Composition (wt% (at.%)) | Solutionizing treatment | ||||
---|---|---|---|---|---|---|
Ce | Nd | Y | Gd | Mg | ||
Mg-0.2Ce | 0.16 (0.03) | - | - | - | Bal. | 500 °C × 24 h |
Mg-0.4Ce | 0.34 (0.06) | - | - | - | Bal. | |
Mg-0.6Ce | 0.60 (0.10) | - | - | - | Bal. | |
Mg-1.0Ce | 1.05 (0.18) | - | - | - | Bal. | |
Mg-1.5Ce | 1.35 (0.24) | - | - | - | Bal. | |
Mg-0.3Nd | - | 0.23 (0.04) | - | - | Bal. | 525 °C × 12 h |
Mg-0.6Nd | - | 0.60 (0.10) | - | - | Bal. | |
Mg-1.0Nd | - | 0.99 (0.17) | - | - | Bal. | |
Mg-2.0Nd | - | 2.00 (0.34) | - | - | Bal. | |
Mg-4.0Nd | - | 3.94 (0.69) | - | - | Bal. | |
Mg-1.0Y | - | - | 0.87 (0.24) | - | Bal. | 525 °C × 12 h |
Mg-2.0Y | - | - | 1.98 (0.55) | - | Bal. | |
Mg-3.0Y | - | - | 3.03 (0.85) | - | Bal. | |
Mg-5.0Y | - | - | 4.51 (1.28) | - | Bal. | |
Mg-6.0Y | - | - | 5.60 (1.60) | - | Bal. | |
Mg-1.0Gd | - | - | - | 0.93 (0.15) | Bal. | 525 °C × 24 h |
Mg-2.0Gd | - | - | - | 2.16 (0.34) | Bal. | |
Mg-4.0Gd | - | - | - | 3.90 (0.62) | Bal. | |
Mg-6.0Gd | - | - | - | 5.36 (0.87) | Bal. | |
Mg-8.0Gd | - | - | - | 8.14 (1.35) | Bal. | |
Mg-10.0Gd | - | - | - | 9.20 (1.54) | Bal. |
Fig. 1. (a-c) BSE micrographs of as-cast Mg-0.4Ce, Mg-0.6Ce and Mg-1.5Ce specimens; (d-f) BSE micrographs of as-solutionized Mg-0.4Ce, Mg-0.6Ce and Mg-1.5Ce specimens; (g) the EDS results of point A; (h) XRD diffraction patterns of as-cast and as-solutionized Mg-1.5Ce specimens; (i) thermal conductivity of as-cast and as-solutionized Mg-Ce alloys.
Fig. 2. (a-c) BSE micrographs of as-cast Mg-1.0Nd, Mg-2.0Nd and Mg-4.0Nd specimens; (d-f) BSE micrographs of as-solutionized Mg-1.0Nd, Mg-2.0Nd and Mg-4.0Nd specimens; (g) the EDS results of point B; (h) XRD diffraction patterns of as-cast and as-solutionized Mg-4.0Nd specimens; (i) thermal conductivity of as-cast and as-solutionized Mg-Nd alloys.
Fig. 3. (a-c) BSE micrographs of as-cast Mg-3.0Y, Mg-5.0Y and Mg-6.0Y specimens; (d-f) BSE micrographs of as-solutionized Mg-3.0Y, Mg-5.0Y and Mg-6.0Y specimens; (g) the EDS results of point C; (h) XRD diffraction patterns of as-cast and as-solutionized Mg-6.0Y specimens; (i) thermal conductivity of as-cast and as-solutionized Mg-Y alloys.
Fig. 4. (a-c) BSE micrographs of as-cast Mg-2.0Gd, Mg-4.0Gd and Mg-10.0Gd specimens; (d-f) BSE micrographs of as-solutionized Mg-2.0Gd, Mg-4.0Gd and Mg-10.0Gd d specimens; (g) the EDS results of point D; (h) XRD diffraction patterns of as-cast and as-solutionized Mg-10.0Gd specimens; (i) thermal conductivity of as-cast and as-solutionized Mg-Gd alloys.
Element | r/Δr (nm) | Valence | Configuration of extra-nuclear electron | Maximum solid solubility (at.%) |
---|---|---|---|---|
Mg | 0.1602 | 2 | 3s2 | - |
Ce | 0.1824/0.222 | 3 | 4f16s2 (6) | 0.09 |
Nd | 0.1821/0.219 | 3 | 4f46s2 (3) | 0.63 |
Y | 0.1803/0.201 | 3 | 4d15s2 (4) | 3.35 |
Gd | 0.1883/0.281 | +2, +3 | 4f75d16s2 (4) | 4.53 |
Table 2 Atomic radius, valence, configuration of extra-nuclear electron and maximum solid solubility in the Mg solid solution of the four solute atoms
Element | r/Δr (nm) | Valence | Configuration of extra-nuclear electron | Maximum solid solubility (at.%) |
---|---|---|---|---|
Mg | 0.1602 | 2 | 3s2 | - |
Ce | 0.1824/0.222 | 3 | 4f16s2 (6) | 0.09 |
Nd | 0.1821/0.219 | 3 | 4f46s2 (3) | 0.63 |
Y | 0.1803/0.201 | 3 | 4d15s2 (4) | 3.35 |
Gd | 0.1883/0.281 | +2, +3 | 4f75d16s2 (4) | 4.53 |
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