J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (3): 306-312.DOI: 10.1016/j.jmst.2018.09.051
• Research Article • Previous Articles Next Articles
Kaiqi Hu, Qingfei Xu, Xia Ma, Qianqian Sun, Tong Gao, Xiangfa Liu*()
Received:
2018-05-10
Revised:
2018-06-10
Accepted:
2018-06-21
Online:
2019-03-15
Published:
2019-01-18
Contact:
Liu Xiangfa
About author:
1 These authors contributed equally to this work.
Kaiqi Hu, Qingfei Xu, Xia Ma, Qianqian Sun, Tong Gao, Xiangfa Liu. A novel heat-resistant Al-Si-Cu-Ni-Mg base material synergistically strengthened by Ni-rich intermetallics and nano-AlNp microskeletons[J]. J. Mater. Sci. Technol., 2019, 35(3): 306-312.
Si | Cu | Ni | Mg | Fe | Mn | Cr | P | Al |
---|---|---|---|---|---|---|---|---|
11.92 | 4.06 | 1.97 | 1.02 | 0.16 | 0.10 | 0.005 | 0.007 | Bal. |
Table 1 Chemical compositions of Al-Si-Cu-Ni-Mg alloy (wt%).
Si | Cu | Ni | Mg | Fe | Mn | Cr | P | Al |
---|---|---|---|---|---|---|---|---|
11.92 | 4.06 | 1.97 | 1.02 | 0.16 | 0.10 | 0.005 | 0.007 | Bal. |
Fig. 1. (a) Image of rod-like Al-8AlN master alloy, (b) SEI image of Al-8AlN master alloy, (c) SEI image of nano-AlNp extracted from Al-8AlN master alloy, showing three-dimensional morphologies and distribution of nano-AlNp and (d) XRD pattern of Al-8AlN master alloy.
Fig. 3. SEI images of B alloy showing semi-continuous Ni-rich intermetallics networks (a) and BA alloy showing distribution of nano-AlNp microskeletons (b).
Fig. 4. (a) Morphology and (b) EDS point analysis of modified eutectic Si phases and (c) EDS mapping results of networks of nano-AlNp microskeletons and Ni-rich intermetallics.
Fig. 5. (a) Bright field image of nano-AlNp microskeletons in BA alloy, (b) selected area electron diffraction pattern (SAED) showing diffraction rings of AlN and (c) HRTEM image indicating three connected AlN particles (the inset showing the diffraction pattern of the middle particle).
Sample | Temperature (°C) | σb (MPa) | σs (MPa) | δ (%) |
---|---|---|---|---|
B alloy | 25 | 255 | 240 | 0.5 |
250 | 188 | 165 | 2 | |
300 | 157 | 146 | 3.5 | |
350 | 85 | 70 | 5 | |
BA alloy | 25 | 295 | 280 | 1 |
250 | 205 | 185 | 1.2 | |
300 | 170 | 163 | 2.3 | |
350 | 106 | 90 | 3.5 |
Table 2 Mechanical properties of B alloy and BA alloy at different temperatures.
Sample | Temperature (°C) | σb (MPa) | σs (MPa) | δ (%) |
---|---|---|---|---|
B alloy | 25 | 255 | 240 | 0.5 |
250 | 188 | 165 | 2 | |
300 | 157 | 146 | 3.5 | |
350 | 85 | 70 | 5 | |
BA alloy | 25 | 295 | 280 | 1 |
250 | 205 | 185 | 1.2 | |
300 | 170 | 163 | 2.3 | |
350 | 106 | 90 | 3.5 |
Fig. 6. Engineering stress-strain curves of tensile test of B alloy and BA alloy at ambient temperature (a) and 350?°C (b), microhardness of B and BA alloy at different temperatures (c) and thermal expansion ratios of B and BA alloy with temperature increasing (d).
Fig. 7. Fractographs of tensile specimen at 350?°C of B alloy (a, b) and BA alloy (c, d) at low (a, c) and high (b, d) magnification, showing coarse Si phases and propagated cracks and distribution of nano-AlNp microskeletons, respectively (the inset exhibits the 3D morphology of nano-AlNp in BA alloy).
Fig. 8. (a) SEM image of BA alloy, (b, c) extracted Ni-rich intermetallics and nano-AlNp microskeletons from (a), with area fractions 5.6% and 3.2% calculated by Image J, (d, e) SEM images of deep etched BA alloy revealing three-dimensional networks of Ni-rich intermetallics and nano-AlNp microskeletons, respectively, (f, g) EDS analyses of points in (d) and (e).
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[3] | Li Runxia, Liu Lanji, Zhang Lijun, Sun Jihong, Shi Yuanji, Yu Baoyi. Effect of Squeeze Casting on Microstructure and Mechanical Properties of Hypereutectic Al-xSi Alloys [J]. J. Mater. Sci. Technol., 2017, 33(4): 404-410. |
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[11] | LI Yunlong HU Jiandong LIAN Jianshe LJian Dept.of Metal Materials Engineering,Jilin Univer sity of Technology,Changchun,130025,ChinaChangchun College of Optics and Fine Mechanics,Changchun,130021,ChinaTo whom correspondence should be addressed. Influence of Laser Coating on Microstructure and Properties of an Al-Si Alloy [J]. J Mater Sci Technol, 1992, 8(3): 214-218. |
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