Effect of TiB on the Nucleation and Growth of α Phase in Ti-6Al-4V-0.1B Alloy

Abstract:

The effect of TiB on the nucleation and growth of α phase both in as-casted and as-annealed Ti-6Al-4V-0.1B alloy by optical microscopy and EBSD technique. The results show that during the solidification α phases nucleate and grow up in the β phase matrix and the interface between beta matrix and TiB phase. TiB phase acts as a nucleation site for α phase and promotes the nucleation and growth, resulting in refined α colonies in as-cast microstructure. During the furnace cooling process from above β transus temperature, α precipitates is a consequence of its orientation relationship with TiB, which restraints the lath growth. Equiaxed α phase precipitates during the furnace cooling from the above β transus temperature.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 284-290
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.284
• Online since: June 2017
• Authors: Yang Yu*, Hong Jiang Li, Xun Jun Mi, Qi Gao
• Keywords: Growth up, Nucleation, Ti-6Al-4V-0.1B Alloy, TiB, α Phase

References

[1] Dalej. Mceldowney, Seshacharyulu Tamirisakandala and Daniel B. Miracle. Heat-treatment effects on the mircrostructure and tensile properties of powder metallurgy Ti-6Al-4V alloys modified with boron [J], Metallurgical and Materials Transactions A. April 2010 (41A): 1003-1015.

DOI: 10.1007/s11661-009-0157-y

[2] Raghavan Srinivasan, Daniel Miracle, Sesh Tamirisakandala. Direct rolling of as-cast Ti-6Al-4V modified with trace additions of boron [J]. Materials Science and Engineering A487 (2008): 541-551.

DOI: 10.1016/j.msea.2007.10.053

[3] Chandran, K.S.R. and D.B. Miracle, Titanium-Boron Alloys and Composites: Processing, Properties, and Applications[J]. JOM, 2004(May): 32-41.

DOI: 10.1007/s11837-004-0124-4

[4] Yamamoto, T. and A. Otsuki, Synthesis of Near Net Shape High Density TiB/Ti Composite[J]. Materials Science and Engineering A, 1997. 239-240: 647-651.

DOI: 10.1016/s0921-5093(97)00643-6

[5] Indrani Sen, S. Tamirisakandala , D.B. Miracle , U. Ramamurty , Microstructural effects on the mechanical behavior of B-modified Ti-6Al-4V alloys, Acta Materialia 55 (2007): 4983-4993.

DOI: 10.1016/j.actamat.2007.05.009

[6] O.O. Bilous, L.V. Artyukh, A.A. Bondar, T. Ya. Velikanova, M.P. Burka M.P. Brodnikovskyi, O.S. Fomichov, N.I. Tsyganenko, S.O. Firstov, Effect of boron on the structure and mechanical properties of Ti-6Al and Ti-6Al-4V[J], Materials Science and Engineering A 402 (2005).

DOI: 10.1016/j.msea.2005.05.011

[7] Dale J. Mceldowney, Seshacharyulu Tamirisakandala, Daniel B. Miracle, Heat-Treatment effects on the microstructure and tensile properties of powder metallurgy Ti-6Al-4V alloys modified with boron[J], Metallurgical and Materials Transactions A, Volume, 41A, April 2010: 1003-1015.

DOI: 10.1007/s11661-009-0157-y

[8] T.M.T. Godfrey, A. Wisbey, P.S. Goodwin, K. Bagnall, C.M. Ward-Close, Microstructure and tensile properties of mechanically alloyed Ti-6Al-4V with boron additions[J], Materials Science and Engineering A282 (2000) : 240-250.

DOI: 10.1016/s0921-5093(99)00699-1

[9] Yang Yu, Songxiao Hui, Wenjun Ye, et al. Study on Hot deformation behavior of Ti-6Al-4V-0. 1B alloy with equiaxed Microstructure [C]. Advanced Materials Research, 2012, 428: 185-189.

DOI: 10.4028/www.scientific.net/amr.428.185

[10] Tamirisakandala S., Bhat R., Miracle D., et al. Effect of boron on the beta transus of Ti-6Al-4V alloy [J]. Scripta materialia, 2005, 53(2): 217-222.

DOI: 10.1016/j.scriptamat.2005.03.038

[11] Tamirisakandala S., Bhat R., Tiley J., et al. Grain refinement of cast titanium alloys via trace boron addition [J]. Scripta materialia, 2005, 53(12): 1421-1426.

DOI: 10.1016/j.scriptamat.2005.08.020

[12] Matthew J. Donachie, J., Titanium: A Technical Guide . 1988, Metals Park, OH: ASM International.

[13] Boyer, R., G. Welsch, and E.W. Collings, Materials Property Handbook: Titanium Alloys . 1994, Materials Park, OH: ASM International.

[14] Collings, E.W., The Physical Metallurgy of Titanium Alloys . Series in Metals Processing. 1984, Metals Park, OH: ASM.