In the biomedicine, titanium with the refined grain is of great demand. The microstructure of the Grade 2 titanium samples was produced by the plastic forming at elevated temperatures and with different strain rates. Sellers–Tegartt equation was applied to verify that plastic forming stresses required to achieve the desired structure. Microstructure was observed with scanning electron and transmission electron microscopes. To characterise the elements of the structure, the electron backscatter diffraction was used. Grains were fragmented mostly with a twinning mechanism. Observations of strain–stress graphs obtained during the deformation indicate that the equilibrium between flow stress and loaded strain was achieved after the processes of dynamic polygonisation and/or recrystallisation.
AhmedM, WexlerD, CasillasG, Strain rate dependence of deformation-induced transformation and twinning in a metastable titanium alloy. Acta Mater. 2016;104:190–200. doi: 10.1016/j.actamat.2015.11.026
2.
MazurkiewiczA, Nanonauki i nanotechnologie: Stan i perspektywy rozwoju[Nanosciences and nanotechnologies. State and development prospects]. Radom: Published by Institute for Sustainable Technologies; 2007.
3.
BylicaA, SieniawskiJ.Tytan i jego stopy[Titanium and its alloys]. Warsaw: PWN; 1985.
4.
ZhangS, Chun WangY, ZhilyaevAP, Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti. Mat Sci Eng A. 2015;641:29–36. doi: 10.1016/j.msea.2015.06.035
5.
ZhangZX, QuSJ, FengAH, Achieving grain refinement and enhanced mechanical properties in Ti–6Al–4 V alloy produced by multidirectional isothermal forging. Mat Sci Eng A. 2017;692:127–138. doi: 10.1016/j.msea.2017.03.024
6.
SemenovaI, SalimgareevaG, Da CostaG, Enhanced strength and Ductility of Ultrafine-Grained Ti Processed by severe plastic deformation. Adv Eng Mater. 2010;12(8):803–807. doi: 10.1002/adem.201000059
7.
UshkovSS, KudryavtsevAS, KarasyevEA.Zakonomiernosti razpredelenya elementov vnedrenya v litom i deformirovannom psevdo- α- splave titana[Distribution of interstage elements in a cast and deformed pseudo-α alloy of titanium]. Metallov. Term. Obrab. Metallov. 1999;9:44–47.
8.
TopolskiK, GarbaczH, PachlaW, Bulk nanostructured titanium fabricated by hydrostatic extursion. Phys Status Solidi (C).2010;7:1391–1394. doi: 10.1002/pssc.200983396
9.
SinhaS, GuraoNP.In situ electron backscatter diffraction study of twinning in commercially pure titanium during tension-compression deformation and annealing. Mater Des. 2017;116:686–693. doi: 10.1016/j.matdes.2016.10.060
10.
LiH, Comparison of the deformation behaviour of commercially pure titanium and Ti-5Al-2.5Sn (wt.%) at 296 and 728K. Philos. Mag. 2013;93:2875–2895. doi: 10.1080/14786435.2013.791752
Nemat-NasserS, GuoWG, ChengJY.Mechanical properties and deformation mechanisms of a commercially pure titanium. Acta Mater. 1999;47(13):3705–3720. doi: 10.1016/S1359-6454(99)00203-7
13.
LeyensC, PetersM, editors. Titanium and titanium alloys: Fundamentals and applications. Weinheim: WILEY-VCH Verlag GmbH & Co. KGaA; 2003.
14.
FernandesaDJ, EliasCN, ValievRZ.Properties and Performance of Ultrafine Grained titanium for Biomedical applications. Mater Res. 2015;18(6):1163–1175. doi: 10.1590/1516-1439.005615
15.
ZherebtsovSV.Formation of submicrocrystalline in titanium and its alloy under serve plastic deformation. Defect Diffus Forum. 2002;208–209:237–240. doi: 10.4028/www.scientific.net/DDF.208-209.237
16.
DyakonovGS, ZherebtsovSV, SilishchevGA.Evolutsya mikrostruktury titana WT1-0 v khode komnatnoy i kriogennoy prokatki[Evolution of the WT1-0 titanium microstructure during rolling in room and cryogenic temperature]. Fiz. Tvyordovo Tela. 2013;2(2):72–78.
17.
ZhuJT, Nanostructures in Ti processed by severe plastic deformation. J. Mater. Res. 2003;18(8):1908–1917. doi: 10.1557/JMR.2003.0267
18.
XuF, Effect of twinning on microstructure and texture evolutions of pure Ti during dynamic plastic deformation. Mater Sci Eng: A. 2013;564:22–33. doi: 10.1016/j.msea.2012.11.097
19.
WangT, LiB, WangZ, Influence mechanism of the initial dislocation boundary on the adiabatic shear sensitivity of commercial pure titanium. Mater Sci Eng: A. 2016;676:1–9. doi: 10.1016/j.msea.2016.08.089
20.
ZhengZ, WaheedS, BalintDS, Slip transfer across phase boundaries in dual phase titanium alloys and the effect on strain rate sensitivity. Int J Plasticity. 2018;104:23–38. doi: 10.1016/j.ijplas.2018.01.011
21.
SozańskaM, ChmielaB.Ocena możliwości stosowania metody EBSD w badaniach mikrostruktury stopów tytanu[Usefulness evaluation of EBSD method application in investigation of microstructure of titanium alloys]. Inz Mater. 2012;33(4):311–314.
22.
ZengZ, ZhangY, JanssonS.Deformation behavior of commercially pure titanium during simple hot pression. Mater Des. 2009;30(8):3105–3111. doi: 10.1016/j.matdes.2008.12.002
23.
ZhaoP, WangY, NiezgodaSR.Microstructural and micromechanical evolution during dynamic recrystallization. Int J Plasticity. 2018;100:52–68. doi: 10.1016/j.ijplas.2017.09.009
24.
FlowerHM.Microstructural development in relation to hot working of titanium alloys. Mater Sci Tech. 1990;6(11):1082–1092. doi: 10.1179/mst.1990.6.11.1082
25.
KoYG, LeeCS, ShinDH, Low-Temperature Superplasticity of Ultra-Fine-Grained Ti-6Al-4V Processed by equal-channel angular pressing. Metall Mater Trans A. 2006;37a:381–391. doi: 10.1007/s11661-006-0008-z
26.
HuangK, LogeRE.A review of dynamic recrystallization phenomena in metallic materials. Mater Des. 2016;111:548–574. doi: 10.1016/j.matdes.2016.09.012
27.
SakaiT, BelyakovA, KaibyshevR, Dynamic and post-dynamic recrystallization under hot, cold and severe plastic deformation conditions. Prog Mater Sci. 2014;60:130–207. doi: 10.1016/j.pmatsci.2013.09.002
28.
BańczerowskiJ, JeleńkowskiJ, SkalskiK, Structure and mechanism of the deformation of Grade 2 titanium in plastometric studies. Mater Sci Technol. 2018. doi:10.1080/02670836.2018.1443608
29.
ČadekJ.Creep kovových materiálů[Creep of metal materials]. Praha: Academia Praha; 1984; p. 129–134.
30.
JonasJJ, SellarsCM, TegartWJ.Strength and structure under hot-working conditions. Metall Rev. 1969;130:1–23.
31.
PiątkowskiA.Nowe możliwości badania struktury materiałów metodą dyfrakcji elektronów wstecznie rozproszonych[New possibilities of studying the structure of materials by the method of backscattered electrons diffraction]. LAB: Laboratoria, Apartura, Badania. 2005;10(4):21–24.
32.
LiZ, WangB, ZhaoS.Dynamic deformation and failure of ultrafine-grained titanium. Acta Mater. 2017;125:210–218. doi: 10.1016/j.actamat.2016.11.041
