Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-11-28T14:21:13.889Z Has data issue: false hasContentIssue false
  • English
  • Français

Cavitation damage incorporating cavity growth in submicrometer-grained titanium alloy

Published online by Cambridge University Press:  31 January 2011

Young Gun Ko ,
Dong Hyuk Shin  and
Chong Soo Lee
Young Gun Ko*
Affiliation:
School of Materials Science and Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea
Dong Hyuk Shin
Affiliation:
Department of Metallurgy and Materials Science, Hanyang University, Ansan 425-791, Republic of Korea
Chong Soo Lee
Affiliation:
Department of Materials Science and Engineering, POSTECH, Pohang 790-784, Republic of Korea
*
a) ddress all correspondence to this author. e-mail: [email protected]
Get access

Abstract

A study was made to investigate cavity growth behavior during the superplastic deformation of submicrometer-grained titanium alloy and to compare that to cavity growth in a coarse-grained counterpart. A series of tension tests were performed at a temperature of 973 K and a strain rate of 10−4 s−1. Microstructures revealed that both the size and the volume fraction of the cavities obviously decreased as the grain size decreased. Working within the framework provided by creep models for understanding cavity growth behavior, we found the dominant growth mechanism to be superplastic diffusion, which leads to high-tensile ductility in submicrometer-grained titanium alloy.

Keywords

Grain sizeMicrostructureTi
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 6 , June 2009 , pp. 2161 - 2165
Copyright
Copyright © Materials Research Society 2009

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1Pilling, J. and Ridley, N.: Superplasticity in Crystalline Solids (The Institute of Metals, London, UK, 1989), p. 102.Google Scholar
2Chokshi, A.H., Mukherjee, A.K., and Langdon, T.G.: Superplasticity in advanced materials. Mater. Sci. Eng., R 10, 237 (1993).CrossRefGoogle Scholar
3Bae, D.H. and Ghosh, A.K.: Cavitation growth during superplastic flow in an Al–Mg alloy: I. Experimental study. Acta Mater. 50, 993 (2002).CrossRefGoogle Scholar
4Lee, C.J. and Huang, J.C.: Cavitation characteristics in AZ31 Mg alloys during LTSP or HSRSP. Acta Mater. 52, 3111 (2004).Google Scholar
5Kawasaki, M., Xu, C., and Langdon, T.G.: An investigation of cavity growth in a superplastic aluminum alloy processed by ECAP. Acta Mater. 53, 5353 (2005).Google Scholar
6Oh-ishi, K., Horita, Z., Smith, D.J., and Langdon, T.G.: Grain boundary structure in Al–Mg and Al–Mg–Sc alloys after equal-channel angular pressing. J. Mater. Res. 16, 583 (2001).Google Scholar
7Mishra, R.S., Stolyarov, V.V., Echer, C., Valiev, R.Z., and Mukherjee, A.K.: Mechanical behavior and superplasticity of a severe plastic deformation processed nanocrystalline Ti–6Al–4V alloy. Mater. Sci. Eng., A 298, 44 (2001).Google Scholar
8Stolyarov, V.V., Zhu, Y.T., Alexandrov, I.V., Lowe, T.C., and Valiev, R.Z.: Grain refinement and properties of pure Ti processed by warm ECAP and cold rolling. Mater. Sci. Eng., A 343, 43 (2003).Google Scholar
9Zhu, Y.T., Huang, J.Y., Gubicza, J., Ungár, T., Wang, Y.M., Ma, E., and Valiev, R.Z.: Nanostructures in Ti processed by severe plastic deformation. J. Mater. Res. 18, 1908 (2003).Google Scholar
10Yapici, G.G., Karaman, I., and Luo, Z.P.: Mechanical twinning and texture evolution in severely deformed Ti–6Al–4V at high temperatures. Acta Mater. 54, 3755 (2006).CrossRefGoogle Scholar
11Valiev, R.Z. and Langdon, T.G.: Principles of equal-channel angular pressing as a processing tool for grain refinement. Prog. Mater. Sci. 51, 881 (2006).CrossRefGoogle Scholar
12Chino, Y., Iwasaki, H., and Mabuchi, M.: Cavity growth rate in superplastic 5083 Al and AZ31 Mg alloys. J. Mater. Res. 19, 3382 (2004).Google Scholar
13Ko, Y.G., Lee, C.S., Shin, D.H., and Semiatin, S.L.: Low-temperature superplasticity of ultra-fine-grained Ti–6Al–4V processed by equal-channel angular pressing. Metall. Mater. Trans. A 37, 381 (2006).CrossRefGoogle Scholar
14Ko, Y.G., Lee, C.S., and Shin, D.H.: Deformation characteristics of submicrocrystalline Ti–6Al–4V. Scr. Mater. 58, 1094 (2008).CrossRefGoogle Scholar
15Stowell, M.J., Livesey, D.W., and Ridley, N.: Cavity coalescence in superplastic deformation. Acta Mater. 32, 35 (1984).Google Scholar
16Semiatin, S.L., Seetharaman, V., and Weiss, I.: Hot workability of titanium and titanium aluminide alloys—An overview. Mater. Sci. Eng., A 243, 1 (1998).Google Scholar
17Wert, J.A. and Paton, N.E.: Enhanced superplasticity and strength in modified Ti–6Al–4V alloys. Metall. Mater. Trans. A 14, 2535 (1983).Google Scholar
18Cope, M.T. and Ridley, N.: Superplastic deformation characteristics of microduplex Ti–6Al–4V alloy. Mater. Sci. Technol. 2, 140 (1986).CrossRefGoogle Scholar
19Chokshi, A.H.: The development of cavity growth maps for super-plastic materials. J. Mater. Sci. 21, 2073 (1986).Google Scholar
20Johnson, C.H., Richter, S.K., Hamilton, C.H., and Hoyt, J.J.: Static grain growth in a microduplex Ti–6Al–4V alloy. Acta Mater. 47, 23 (1999).Google Scholar