J. Mater. Sci. Technol. ›› 2020, Vol. 47: 142-151.DOI: 10.1016/j.jmst.2019.12.021
• Research Article • Previous Articles Next Articles
Qiuju Zhenga,b, Lili Zhanga, Hongxiang Jianga, Jiuzhou Zhaoa,b,*(), Jie Hea,b
Received:
2019-11-13
Revised:
2019-12-20
Accepted:
2019-12-26
Published:
2020-06-15
Online:
2020-06-24
Contact:
Jiuzhou Zhao
Qiuju Zheng, Lili Zhang, Hongxiang Jiang, Jiuzhou Zhao, Jie He. Effect mechanisms of micro-alloying element La on microstructure and mechanical properties of hypoeutectic Al-Si alloys[J]. J. Mater. Sci. Technol., 2020, 47: 142-151.
Samples | Si | Mg | Fe | Cu | P | La | Other impurity | Al |
---|---|---|---|---|---|---|---|---|
Pure Al | 0.0003 | 0.0027 | 0.0008 | 0.0011 | 0.0003 | - | <0.005 | Bal. |
Pure Si | Bal. | 0.0002 | 0.0002 | 0.0003 | - | - | <0.0001 | 0.0003 |
Al-9La | 0.05 | 0.001 | 0.01 | 0.008 | - | 8.93 | <0.01 | Bal. |
Table 1 The chemical compositions of the raw materials (wt.%).
Samples | Si | Mg | Fe | Cu | P | La | Other impurity | Al |
---|---|---|---|---|---|---|---|---|
Pure Al | 0.0003 | 0.0027 | 0.0008 | 0.0011 | 0.0003 | - | <0.005 | Bal. |
Pure Si | Bal. | 0.0002 | 0.0002 | 0.0003 | - | - | <0.0001 | 0.0003 |
Al-9La | 0.05 | 0.001 | 0.01 | 0.008 | - | 8.93 | <0.01 | Bal. |
Fig. 1. Grain structures of the Al-6Si alloys with different additive amounts of La. 0 La (a), 0.01% La (b), 0.02% La (c), 0.04% La (d), 0.06% La (e) and 0.10% La (f).
Fig. 3. SEM images of the Al-6Si alloys with different additive amounts of La. 0 La (a), 0.01% La (b), 0.02% La (c), 0.04% La (d), 0.06% La (e) and 0.10% La (f).
Fig. 5. EPMA mapping of the eutectic Si and La-rich phase particles in the Al-6Si alloy with 0.06% La addition: BEI image (a), Al map (b), Si map (c), and La map (d).
Fig. 6. TEM bright-field image (a), SAED pattern in the zone axis of [$\bar{1}10$]LaAlSi (b) and EDS point analysis (c) for the LaAlSi phase in the Al-6Si alloy with 0.10% La addition.
Fig. 7. DTA cooling curves for the Al-6Si alloys with different addition amount of La (a), change of the nucleation undercooling of the α-Al grains ($\Delta T_{\Delta }^{\text{ }\!\!\alpha\!\!\text{ }-\text{A}1}$) and the eutectic Si ($\Delta T_{\Delta }^{\text{Si}}$) (b) due to the addition of La.
Fig. 8. TEM bright-field images for the eutectic Si particle without (a) and with (b) twins and their SAED patterns in the zone axis of [011]Si (c,d) in the Al-6Si alloy without La addition.
Fig. 9. TEM bright-field images for the stacking faults (a), the twinned Si particles (b) and their SAED patterns in the zone axis of [011]Si (c, d) in the Al-6Si alloy with 0.06% La addition.
Alloys | YS, MPa | UTS, MPa | EI, % | Q, MPa |
---|---|---|---|---|
Al-6Si | 54.2 (1.2) | 155.0 (2.6) | 6.7 (0.5) | 278.9 |
Al-6Si-0.01La | 55.0 (0.8) | 157.9 (1.2) | 7.5 (0.5) | 289.2 |
Al-6Si-0.02La | 54.5 (0.9) | 158.5 (2.2) | 8.5 (0.7) | 297.9 |
Al-6Si-0.04La | 54.6 (1.8) | 160.4 (2.4) | 9.5 (0.4) | 306.8 |
Al-6Si-0.06La | 54.5 (1.4) | 161.4 (1.7) | 12.9 (0.3) | 328.0 |
Al-6Si-0.08La | 54.9 (1.0) | 163.9 (1.5) | 10.9 (0.4) | 319.5 |
Al-6Si-0.10La | 54.6 (2.1) | 158.5 (3.2) | 10.1 (0.6) | 309.1 |
Table 2 Tensile properties of the Al-6Si alloys with different CLa (with standard deviations in brackets).
Alloys | YS, MPa | UTS, MPa | EI, % | Q, MPa |
---|---|---|---|---|
Al-6Si | 54.2 (1.2) | 155.0 (2.6) | 6.7 (0.5) | 278.9 |
Al-6Si-0.01La | 55.0 (0.8) | 157.9 (1.2) | 7.5 (0.5) | 289.2 |
Al-6Si-0.02La | 54.5 (0.9) | 158.5 (2.2) | 8.5 (0.7) | 297.9 |
Al-6Si-0.04La | 54.6 (1.8) | 160.4 (2.4) | 9.5 (0.4) | 306.8 |
Al-6Si-0.06La | 54.5 (1.4) | 161.4 (1.7) | 12.9 (0.3) | 328.0 |
Al-6Si-0.08La | 54.9 (1.0) | 163.9 (1.5) | 10.9 (0.4) | 319.5 |
Al-6Si-0.10La | 54.6 (2.1) | 158.5 (3.2) | 10.1 (0.6) | 309.1 |
Phase | Crystal structure | Lattice parameters, nm | δAl, % | δSi, % |
---|---|---|---|---|
Al | Cubic | 0.4049 [ | - | 25.4 |
Si | Cubic | 0.5431 [ | 34.1 | - |
AlP | Cubic | 0.5467 [ | 35.0 | <1.0 |
LaP | Cubic | 0.6025 [ | 48.8 | 10.9 |
Table 3 Crystallographic data for some phases and their disregistry to Al phase (δAl) and Si phase (δSi).
Phase | Crystal structure | Lattice parameters, nm | δAl, % | δSi, % |
---|---|---|---|---|
Al | Cubic | 0.4049 [ | - | 25.4 |
Si | Cubic | 0.5431 [ | 34.1 | - |
AlP | Cubic | 0.5467 [ | 35.0 | <1.0 |
LaP | Cubic | 0.6025 [ | 48.8 | 10.9 |
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