The Effects of Fe-Particles on the Tensile Properties of Al-Si-Cu Alloys
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Tensile Properties of As-Cast Samples
3.2. Macroscopic Fracture Surface Investigation, As-Cast Samples
3.3. Fracture Surface Investigation by SEM-EDS, As-Cast Samples
3.4. Microscopy of the Fracture Path
3.5. Effects of HIPing
4. Discussion
5. Conclusions
- Two alloys with different chemical compositions and different solidification rates (SDAS), but with similar β-particles size, exhibited similar UTS and ef.
- Mn and Cr additions to the Al-Si alloy modified the morphology of β-particles into sludge particles and decreased mechanical properties. Hence, the use of these modifiers should be used with care.
- Sludge governs, to some extent, the formation of porosity in the directional solidified samples. The porosity at the fracture surfaces increased in alloys where the Fe-rich particles were modified into sludge.
- Fe-rich β-particles and sludge fracture preferably through cleavage without influence of oxides, but not by particle-matrix decohesion.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Alloy | Si | Fe | Cu | Mn | Mg | Cr | Ni | Zn | Pb | Sn | Sr | Al | SF | Fe/Mn |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
A | 9.30 | 0.74 | 2.79 | 0.25 | 0.05 | 0.03 | 0.04 | 0.96 | 0.06 | 0.03 | 0.022 | Bal. | 1.3 | 3.0 |
B | 9.40 | 1.17 | 2.77 | 0.25 | 0.05 | 0.03 | 0.04 | 0.91 | 0.05 | 0.03 | 0.027 | Bal. | 1.8 | 4.7 |
C | 9.23 | 1.29 | 2.65 | 0.53 | 0.04 | 0.15 | 0.04 | 0.86 | 0.05 | 0.03 | 0.025 | Bal. | 2.8 | 2.4 |
D | 9.30 | 1.59 | 2.64 | 0.80 | 0.04 | 0.18 | 0.04 | 0.80 | 0.05 | 0.03 | 0.029 | Bal. | 3.7 | 2.0 |
Measured Feature | Alloy A | Alloy B | ||
---|---|---|---|---|
SDAS 10 | SDAS 25 | SDAS 10 | SDAS 25 | |
Average β-particle length (µm) 1 | 40 ± 12 | 79 ± 26 | 74 ± 19 | 160 ± 45 |
UTS (MPa) | 297 ± 14 | 258 ± 24 | 262 ± 50 | 228 ± 9 |
ef (%) | 7.5 ± 2.6 | 3.4 ± 1.1 | 3.5 ± 2.4 | 1.1 ± 0.1 |
Area% β-particles | 1.12 ± 0.24 | 1.21 ± 0.58 | 2.08 ± 0.27 | 2.91 ± 0.57 |
Measured Feature | As-Cast (SDAS 10) | HIPed (SDAS 10) | ||
---|---|---|---|---|
A and B | C and D | A and B | C and D | |
No of samples with porosity | 1 of 12 | 9 of 11 | 2 of 9 | 4 of 10 |
Porosity area (%) | 1.9 ± n/a | 7.4 ± 5.7 | 1.5 ± 1.6 | 1.5 ± 0.5 |
Average No of pores | 4 ± n/a | 7.9 ± 5.3 | 1 ± 0 | 1.5 ± 0.6 |
Average size of pores (mm2) | 0.13 ± 0.06 | 0.27 ± 0.26 | 0.42 ± 0.44 | 0.29 ± 0.16 |
No of samples with oxides | 2 of 12 | 5 of 11 | 2 of 9 | 5 of 10 |
Oxides area (%) | 15.7 ± 11.5 | 12.7 ± 12.7 | 29.9 ± 20.6 | 23.6 ± 12.5 |
Tensile Property | As-Cast (SDAS 10) | HIPed (SDAS 10) | ||
---|---|---|---|---|
A and B | C and D | A and B | C and D | |
UTS (MPa) | 295 ± 14 | 221 ± 22 | 273 ± 19 | 229 ± 14 |
ef (%) | 6.4 ± 2.5 | 1.6 ± 0.6 | 7.0 ± 3.1 | 2.6 ± 0.8 |
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Bjurenstedt, A.; Seifeddine, S.; Jarfors, A.E.W. The Effects of Fe-Particles on the Tensile Properties of Al-Si-Cu Alloys. Metals 2016, 6, 314. https://doi.org/10.3390/met6120314
Bjurenstedt A, Seifeddine S, Jarfors AEW. The Effects of Fe-Particles on the Tensile Properties of Al-Si-Cu Alloys. Metals. 2016; 6(12):314. https://doi.org/10.3390/met6120314
Chicago/Turabian StyleBjurenstedt, Anton, Salem Seifeddine, and Anders E. W. Jarfors. 2016. "The Effects of Fe-Particles on the Tensile Properties of Al-Si-Cu Alloys" Metals 6, no. 12: 314. https://doi.org/10.3390/met6120314