Morphologies and Formation Mechanism of Interconnected Pores in a Spray Formed 7XXX Aluminum Alloy

Abstract:

In this paper, Al-Zn-Mg-Cu alloys were produced through spray forming technique. Microstructures of interconnected porosity defects in spray-deposited preforms were characterized by means of field emission scanning electron microscopy (FESEM). The formation mechanisms of different types of interconnected pores were investigated. The densification of deposited alloy preforms with interconnected pores was also analyzed. Interconnected pores in deposited alloys may be classified into four types, interconnected pores between interstices, between gas pores, between interstices and gas pores, and interconnected pores associated with solidification shrinkage, according to morphology and formation mechanism.

• Periodical: Materials Science Forum (Volume 788)
• Pages: 193-200
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.788.193
• Online since: April 2014
• Authors: Yi Bin Yin*, Yong An Zhang, Bai Qing Xiong, Feng Wang, Hong Wei Liu, Zhi Hui Li, Xi Wu Li
• Keywords: 7xxx Aluminum Alloy, Interconnected Pores, Spray Forming

References

[1] E. J. Lavernia, Y. Wu: Spray atomization and deposition (John Wiley & Sons Ltd, Chichester 1996, 232-233)

[2] N. Q. Chinh, Z. S. Kovacs, L. Reich: Mater. Sci. Forum Vol.217 (1996), pp.1293-1298

[3] E. Salamci: Turkish J. Eng. Env. Sci. 2002, 26: 345-352.

[4] M. M. Sharma: Investigation of the structure/property relationship of spray formed 7xxx series high strength aluminum alloys and their metal matrix composites. Ph. D Dissertation, University of Pennsylvania, 2000.

[5] M. De Sanctis: Materials Science and Engineering: A Vol.141 (1991), pp.103-121.

[6] E. Salamci: Turkish J. Eng. Env. Sci., Vol.25 (2001), p.681.

[7] M. M. Sharma: Materials Characterization Vol.59 (2008), pp.91-99．

[8] M. M. Sharma, A. Ateaum, T. J. Feden: Acta Materialia Vol.53 (2005), pp.2919-2924．

[9] Xiong Baiqing, Zhang Yongan, Zhu Baohong, Liu Hongwei, Li Zhihui, Shi Likai: Materials Science Forum Vol. 475-479 (2005), pp.2785-2788.

[10] H. Liu, R. H. Rangel, E. J. Lavernia: Materials Science and Engineering: A Vol. 191 (1995), pp.171-184

[11] S. Annavarapu, R. Doherty: International Journal of Powder Metallurgy Vol. 29 (1993), pp.345-351

[12] J. Zhou, J. Duszczyk, B. M. Korevaar: J. Mater. Sci. Vol. 26 (1991), p.824.

[13] K. Mori, K. Osakada: International Journal of Mechanical Sciences Vol. 29 (1987), pp.229-238