A Study on Variation of Microstructural Parameters in Titanium Alloys during near Superplastic Regime of Deformation

Abstract:

Article Preview

Deformation of Titanium alloys close to optimal superplastic condition i.e. near superplastic regime of deformation leads to significant change in microstructures.VT-9 titanium alloy was used in order to find out those parameters of microstructure which are varying significantly during near superplastic regime of deformation. Tensile tests were carried out at 930°C up to fracture with a constant strain rate of 5*10-4 s-1 and a jump wise varying strain rate of 1*10-4 s-1 & 5*10-4 s-1 .The microstructural parameters of both air-cooled and water quenched portion i.e. size of alpha phase, percentages of alpha phase and parameter of non-uniaxiality of alpha phase were found to change significantly during near superplastic regime of deformation. It has been found that in the near superplastic regime of deformation percentage of α-phase decreased from 90% to 13%. As the β-transus temperature of this alloy is 970°C, this significant change in percentage of α-phase is attributed to deformation induced phase transformation. Optical microscopes, micro Vickers hardness test, XRD, FESEM have been used to characterize the microstructure of the material.

Info:

Periodical:

Edited by:

Wu Fan

Pages:

4723-4729

DOI:

10.4028/www.scientific.net/AMM.110-116.4723

Citation:

R.K. Sahoo et al., "A Study on Variation of Microstructural Parameters in Titanium Alloys during near Superplastic Regime of Deformation", Applied Mechanics and Materials, Vols. 110-116, pp. 4723-4729, 2012

Online since:

October 2011

Export:

Price:

$35.00

[1] Terence G. Langdon, Seventy-five years of superplasticity: historic developments and new opportunities, Journal of material sciences, Vol. 44, 2009, pp.5998-6010.

DOI: 10.1007/s10853-009-3780-5

[2] S.S. Bkhattacharya O.I. Bylya R.A. Vasin, andK.A. Padmanabhan, Mechanical Behavior of Titanium Alloy Ti-6Al-4V with Unprepared Microstructure under Jump wise Variations of the Strain Rate in the Superplastic State, Mechanics of Solids, Vol. 44, No. 6, 2009, p.951.

DOI: 10.3103/s0025654409060120

[3] Olga I. Bylya, Rudolf A. Vasin and Manoj k. Sarangi, On the behavior of titanium alloys during deforming in near superplastic regimes, AIP conference proceedings, volume 1063, 2008 and p.349.

DOI: 10.1063/1.3027179

[4] H. L Xing, C.W. Wang, K.F. Zhang and Z.R. Wang, Recent development in the mechanics of superplasticity and its applications, Journal of materials processing technology, Vol. 151, 2004, p.196 – 202.

DOI: 10.1016/j.jmatprotec.2004.04.039

[5] Sami Abualnoun Ajeel, Thair L. Alzubaydi, Abdulsalam K. Swadi Influence of Heat Treatment Conditions on Microstructure of Ti-6Al-7Nb Alloy As Used Surgical Implant Materials, Eng. & Technology, Vol. 25, No. 3, (2007).

[6] G. Lutjering, Influence of processing on microstructure and mechanical properties of (α+β) titanium alloys, Materials Science and Engineering A, vol. 243, 1998, p.32–45.

DOI: 10.1016/s0921-5093(97)00778-8

[7] H.J. Rack, J.I. Qazi, Titanium alloys for biomedical applications, Materials Science and Engineering C, Vol. 26, 2006, p.1269 – 1277.

DOI: 10.1016/j.msec.2005.08.032

[8] J. Tiley , T. Searles, E. Lee, S. Kar, R. Banerjee , J.C. Russ , H.L. Fraser , Quantification of micro structural features in α/β titanium alloys, Materials Science and Engineering A , Vol . 372 , 2004 P. 191–198.

DOI: 10.1016/j.msea.2003.12.008

[9] P.C. Collins , B. Welk, T. Searles, J. Tiley, J.C. Russ, H.L. Fraser, Development of methods for the quantification of microstructural features in α+β processed α/β titanium alloy, Materials Science and Engineering A , Vol . 508 , 2009. p.174–182.

DOI: 10.1016/j.msea.2008.12.038

[10] ASTM E112-96, Standard Test Methods for Determining Average Grain Size, ASTM, (1996).

[11] ASTM E1181-02, Standard Test Methods for Characterizing Duplex Grain Size, ASTM, (2008).

[12] D. Scott Mackenzie, History of quenching, Unpublished.

[13] L.A. Xue, R. Raj, Deformation-induced phase transformation in Zinc sulfide, Journal of materials science letters, Vol. 9, 1990, pp.818-819.

In order to see related information, you need to Login.