STUDY ON FORMATION OF RAPID SOLODIFIED AlFeSi BASED ALLOY ADDED WITH Mn AND RARE EARTH METALS

Nguyễn Hồng Hải; Lê Minh Đức; Hoàng Thị Ngọc Quyên; Nguyễn Ngọc Tiến; Nguyễn Quốc Tuấn

doi:10.34238/tnu-jst.9526

STUDY ON FORMATION OF RAPID SOLODIFIED AlFeSi BASED ALLOY ADDED WITH Mn AND RARE EARTH METALS

About this article

Received: 03/01/24 Revised: 29/02/24 Published: 29/02/24

Authors

1. Nguyen Hong Hai, Hanoi University of Science and Technology
2. Le Minh Duc, Le Quy Don University
3. Hoang Thi Ngoc Quyen , Hanoi University of Science and Technology
4. Nguyen Ngoc Tien, Thai Nguyen Department of Science and Technology
5. Nguyen Quoc Tuan, Hanoi Industrial University

Abstract

Al-Si alloys are most used among Al alloys due to their good mechanical, as same as casting properties. The problem is the existence of very harmful b-Al₅FeSi intermetallic compound, which should be replaced by less harmful Chinese script a-Al₈Fe₂Si or by more complicated and compact AlFeSiMn compound. So, the problem can be resolved by adding some elements such as Mn or rare earth metals or by high cooling rate. Thus, 1.5 kg material of composition as Si: 1.94%, Mn: 4.1%, Fe: 1.04%, Al al. is melted in a resistant furnace, degassed by Ar blowing into the melt for 2 minutes then poured into vacuum copper mold to prepare the specimens of the thickness 1, 3 and 6 mm to produce very high cooling rate, which can reach 10³ K/s. With the presence of Mn the harmful Fe-containing phase, such as b-Al₅FeSi, can be partly replaced by more compact 4-component intermetallic AlMnFeSi due to the fact that Fe-atoms can be substituted by Mn-atoms. High cooling rate depress the diffusion of Si from the melt to the Chinese script a-Al₈Fe₂Si and keep it stable at room temperature. Adding of rare earth can change the morphology of b-Al₅FeSi phase to much finer by “poison” mechanism. As the results, the harmful b-Al₅FeSi phase is completely absent or broken down into small debris, expecting to enhance the mechanical properties of alloys.

Keywords

-Al8Fe2Si; -Al5FeSi; Cooling rate; Rare earth; Manganese

Full Text:

PDF (Tiếng Việt)

References

[1] J. R. Davis (editor), Aluminum and aluminum alloys. ASM International, Ohio, 1993.

[2] A. Couture, “Iron in aluminum casting alloys-A literature survey,” AFS Int. J. Cast. Met., vol. 6, pp. 9-17, 1981.

[3] N. T. Nguyen and H. H. Nguyen, “Effect of electromagnetic stirring on the shape change, size of intermetallic phases and mechanical properties of A356 alloy,” in The 13th Asian Foundry Congress, 2015, pp. 227-233.

[4] L. Bäckerud, G. Chai, and J. Tamminen, Solidification Characteristics of Aluminum Alloys: Foundry Alloys, vol. 2, AFS/Skanaluminum, 1990, pp. 71-84.

[5] R. Kakitani, A. V. Rodrigues, C. Silva, A. Garcia, and N. Cheung, “The roles of solidification cooling rate and (Mn,Cr) alloying elements in the modification of β-AlFeSi and hardness evolvements in near-eutectic Al-Si alloys,” Journal of Alloys and Metallurgical Systems, vol. 1, 2023, doi: 10.1016/j.jalmes.2023.100005.

[6] J. M. Sanchez, M. Arribas, H. Galarraga, M. G. de Cortazar, M. Ellero, and F. Girot, “Effects of Mn addittion, cooling rate and holding temperature on the modification and purification of iron-rich compounds in AlSi10MnMg(Fe) alloy,” Hellyon, vol. 9, no. 2, 2023, Art. no. e13005.

[7] X. Lan, K. Li, J. Wang, and M. Yang, “Developing Al–Fe–Si alloys with high thermal stability through tuning Fe, Si contents and cooling rates,” Intermetallics, vol. 144, no. 2, 2022, Art. no. 107505, doi: 10.1016/i.internat 2022.107505.

[8] D.-F. Song, Y.-L. Zhao, Z. Wang, Y.-W. Jia, H. Huang, D.-T. Zhang, and W.-W. Zhang, “Effect of Mn/Fe ratio on Fe removal efciency and tensile ductility of an Al–7.0Si–2.4Fe alloy,” Journal of Materials Research, vol. 36, pp. 1357–1366, 2021, doi: 10.1557/s43578-021-00194-6.

[9] D.-F. Song, Y.-L. Zhao, Z. Wang, Y.-W. Jia, D.-X. Li, Y.-N. Fu, D.-T. Zhang, and W.-W. Zhang, “3D Fe-rich phases evoluation and its effect on the fracture behavior of Al-7.0Si-1.2Fe alloys by Mn neutralization,” Acta Metallurgica Sinica (English Letters), vol. 35, pp. 163–175, 2022.

[10] X.-Z. Zhang, D.-T. Wang, X.-Z. Li, H.-T. Zhang, and H. Nagaumi, “Understanding crystal structure and morphology evolution of Fe, Mn, Cr-containing phases in Al-Si cast alloy,” Intermetallics, vol. 131, 2021, Art. no. 107103.

[11] X. Z. Zhang, D.-T. Wang, H. Nagaumi, Y.-X. Zhou, W. Yu, X.-Y. Chong, X.-Z. Li, and H.-T. Zhang, “Morphology, thermal stability, electronic structure and mechanical properties of α-AlFeMnSi phases with varying Mn/Fe atomic ratios: Experimental studies and DFT calculations,” Journal of Alloys and Compounds, vol. 901, April 2022, Art. no. 163523.

[12] X.-M. Chen, Q.-P. Dong, Z.-G. Liu, and H. Nagaumi, “Fe-bearing intermetallics transformation and its influence on the corrosion resistance of AlMgSi alloy weld joints,” Journal of materials research and Technology, vol. 9, no. 6, pp. 16116-16125, 2020.

[13] Y. Yang, “Primary solidification of ternary compounds in Al-rich AlMnCe alloys,” Journal of Alloys and Compounds, vol. 844, 2020, Art. no.156048, doi: 10.1016/j.jallcom.2020.156048.

[14] F. Prusa, D. Vojteˇ, M. Bláhová, A. Michalcová, T. Fr. Kubatík, and J. Cˇízˇek, “Structure and mechanical properties of Al–Si–Fe alloys prepared by short-term mechanical alloying and spark plasma sintering,” Materials and Design, vol. 75, pp. 66-75, 2015.

[15] J. Yu, “Formation of Intermetallic Phases in Al-10Si-0.3Fe based Alloys,” PhD. dissertation, the Institute of Applied Materials of the Helmholtz-Zentrum Berlin for Material and Energy, Berlin 2016.

[16] C.-L. Chen, “Characterisation of Intermetallic Phases in Multicomponent Al-Si Alloys for Piston Applications,” Doctoral thesis, Institute of Polymer Technology and Materials Engineering Loughborough University, September, 2006.

[17] J. A. G. Toscano et al., “Microstrcture of Al₉(MnFe)Si intermetallic produced by pressure-assisted reactive sintering of elemental AlMnFeSi powder mixtures,” Materials Letters, vol. 57, no. 15, pp. 2246-2252, 2003.

[18] P. B. Crosley and L. F. Mondolfo, “The mechanism of silicon modification in aluminum-silicon alloys: Impurity induced twinning,” AFS Trans., vol. 74, pp. 53-64, 1966.

[19] S.-Z. Lu and A. Hellawell, “The mechanism of silicon modification in aluminum-silicon alloys: Impurity induced twinning,” Metallurgical Transactions A, vol. 18, pp.1721–1733, 1987.

DOI: https://doi.org/10.34238/tnu-jst.9526

Refbacks

There are currently no refbacks.



Remember me