An Analysis of Superplastic Forming in a Re-Entrant Shape

Abstract:

Superplasticity is the ability of a polycrystalline material to exhibit, very large elongations without necking prior to failure in generally isotropic manner. Elongations in excess of 400% are usually referred to as Superplasticity. As the limitations of sheet metal fabrication are most often determined by the tensile ductility, superplasticity in sheet metals offers advantages for the forming of complex shapes easily as a regular production process.The focus of the present work is to arrive at the optimum process parameters in the superplastic forming in re-entrant shape of 7075 aluminium alloy, so as to achieve minimum thinning, lesser forming time and reduction in micro cavities.

• Periodical: Materials Science Forum (Volumes 838-839)
• Pages: 540-545
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.838-839.540
• Online since: January 2016
• Authors: G. Kumaresan*, Kalaichelvan Kani
• Keywords: Cavitation, Dynamic Control, Superplastic Forming, Thinning Factor

References

[1] K. A. Padmanabhan, Superplasticity, Springer-Verlag Berlin Heidelberg, New York, (1980).

[2] H.L. Xing, C.W. Wang, K.F. Zhang, Z.R. Wang, Recent development in the mechanics of superplasticity and its application, J. Mater. Process. Technol. 151 (2004) 196- 202.

[3] Young-Seon Lee, Sang-Yong Lee, Jung-HwanLee, A Study on the process to control the cavity and the thickness distribution of superplastically formed part, J. Mater. Process. Technol. 112 (2001) 114-120.

DOI: 10.1016/s0924-0136(01)00564-7

[4] Dong H. Shin, Yeon J. Joo, Woo J. Kim, Chong S. Lee, Microstructural evolution during superplastic deformation of a 7475 Al alloy, J. Mater. Sci. 33 (1998) 790-784.

DOI: 10.1023/a:1004383420256

[5] A. Smolej, M. Gnamus, E. Slacek, The Influence of the thermo mechanical processing and forming parameters on superplastic behaviour of the 7475Aluminum alloy, J. Mater. Process. Technol. 118 (2001) 397-402.

[6] Taharsahraoui, Mohamedhadji, Nacerbacha, Riadbadji, Superplastic deformation behavior of 7075 aluminum alloy, The International J. Mech. Eng. Perform. 12 (2003) 398-401.

[7] Xing Huilin, Zhang Kaaifeng, Qiao Yu, Z.R. Wang, An advanced superplastic sheet – forming machine controlled by microcomputer, J. Mater. Process. Technol. 55 (1995) 43-47.

DOI: 10.1016/0924-0136(95)01810-7

[8] Abdel- Wahab El-Morsy, Ken-ichi Manabe, FE simulation of rectangular box forming using material characteristics from the multi-dome forming test, J. Mater. Process. Technol. 125 (2002) 772-777.

DOI: 10.1016/s0924-0136(02)00389-8

[9] G. Kumaresan, K. Kalaichelvan, Multi-dome test for determining the strain rate sensitivity index of a superplastic 7075 Al alloy sheet, J. Alloy. Comp. 583 (2014) 226-230.

DOI: 10.1016/j.jallcom.2013.08.194

[10] G. Kumaresan, K. Kalaichelvan, Experimental investigation on the rectangular cup formability of Al-alloy sheet by superplastic forming technique, J. Scien. Ind. Res. 73(2014)46-50.

DOI: 10.4028/www.scientific.net/amr.622-623.442

[11] Kinji Hirai, Hidetoshi Somekawa, Yorinobu Takigawa, Kenji Higashi, Superplastic forging with dynamic recrystallization of Mg-Al-Zn alloys cast by thixo-molding, Scripta. Mater. 56 (2007) 237-240.

DOI: 10.1016/j.scriptamat.2006.09.037

[12] Z. Horita, M. Furukawa, M. Nemoto, A.J. Barnes, Superplastic forming at high strain rate after severe plastic deformation, Acta. Mater. 48(2000) 3633-3640.

DOI: 10.1016/s1359-6454(00)00182-8