Effect of Co on Microstructure and Properties of Al-30%Si Alloys

Abstract:

In this paper, the effects of different Co contents on the microstructure and properties of Al-30% Si alloy were studied by means of metallographic microscope, microhardness tester, XRD, conductivity tester and DSC thermal analyzer. The results show that cobalt can effectively improve the microstructure of the alloy, the long needle eutectic silicon becomes short rod, and the coarse irregular block primary silicon particles become smaller. When 0.3% cobalt is added into the alloy, the refining effect of eutectic silicon is the most obvious. When the amount of Co is 0.6%, the refinement effect of primary silicon is the best. The addition of Co can improve the hardness of the alloy. When 0.6 ~ 0.9% cobalt is added, the hardness is the highest. With the increase of Co content, the conductivity and transformation latent heat of the alloy show the same change law. When 0.6% cobalt is added, its value is the maximum. It can be seen that when the Co content is 0.6%, the microstructure and comprehensive properties of the alloy are the best.

• Periodical: Materials Science Forum (Volume 1079)
• Pages: 15-20
• DOI: https://doi.org/10.4028/p-ho07lr
• Online since: December 2022
• Authors: Xiao Song Li*, Wu Yong Zhong, Rui Liao
• Keywords: Al-30%Si, Co, Latent Heat, Microstructure

References

[1] Kobayashi K, Shingu P H, Ozaki R: Journal of Materials Science Vol. 10(1975), pp.290-299.

[2] Min Z, Zhao D, Teng X, et al.: Materials & Design Vol. 47(2013), pp.857-864.

[3] Xu C L, Jiang Q C, Yang Y F, et al.: Journal of Alloys and Compounds Vol. 422(2006), p. L1-L4.

[4] Li, J. H., et al.: Acta Materialia Vol. 84(2015), pp.153-163.

[5] Li C, Pan Y, Lu T, et al.: Metals and Materials International, Vol. 2018, 24(5).

[6] Nogita K, Yasuda H, Yoshiya M, et al.: Journal of Alloys & Compounds Vol. 489(2010), pp.415-420.

[7] Jun Shan, Zhuang De Xie, Yu Lai Gao: J Mater Sci Lett Vol. 20(2001), p.1513.

[8] Li Yuanyuan, Zhang Daton g, Zhang Weiwen: Trans Nonferrous Met Soc China Vol. 12(2002), p.878.

[9] Zoua Q, Ning H, Shenb Z, et al.: Separation and Purification Technology Vol. 207(2018).

[10] Jung J G, Ahn T Y, Cho Y H, et al.: Acta Materialia Vol. 2017, p. S1359645417308972.

[11] Mirzadeh H, Niroumand B: Journal of Materials Processing Technology Vol. 209(2009), pp.4977-4982.

[12] Srivastava V C, Mandal R K, Ojha S N: Materials Science & Engineering A Vol.383(2004), pp.14-20.

[13] Srivastava V C, Mandal P K, Ojha S N: Mater Sci Eng A Vol. 304-306(2001), p.555.

[14] Kim W J, Yeon J H, Lee J E: J Alloys Comp. Vol. 308(2000), p.237.

[15] Zhao L Z, Zhao M J, Song L J, et al.: Materials & Design (1980-2015) Vol. 56(2014), pp.542-548.

[16] Huang Huiyi, Liu Yiyuan, Tang Peng, et al.: Materials Reports Vol. 34(2020), pp.16087-16093.

[17] Marcella G. C. Xavier, Thaisa M. G. Souza, Noé Cheung, et al.: Int. J. Adv. Manuf. Technol. Vol. 107 (2020), p.717–730.

[18] Mulazimoglu M H, Drew R A L, Gruzleski J E.: Metallurgical Transactions A Vol., 20(1989), pp.383-389.