Experimental and theoretical study of Ti-6Al-4V to 220 GPa

MacLeod, Simon; Tegner, Bengt E.; Cynn, Hyunchae; Evans, W. J.; Proctor, John E.; McMahon, M. I.; Ackland, Graeme J.

doi:10.1103/physrevb.85.224202

Cited by 15 publications

(26 citation statements)

References 41 publications

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“…Therefore, we infer that the dynamic α→β transformation might occur during the α + β forging of the large-scale Ti-5553 alloy billet. In addition, the high pressure and the related stress concentration of the α + β forging may also lead to the α→ω→β transformation in the sub-transus forging [ 21 , 22 ].…”

Section: Discussionmentioning

confidence: 99%

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

Qin

Liu

2023

Materials

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In order to fabricate homogeneous large-scale Ti-5Al-5V-5Mo-3Cr (Ti-5553) alloy bulk with fine and equiaxial β grain, we performed a series of multi-axial α + β field forging with 62 forging cycles on the large-scale Ti-5553 billet by using 12.5 MN high-speed hydraulic press. The β-annealed microstructure was the starting microstructure of the billet. After the 6th forging cycle, β grain deformed dramatically, and the grain-boundary network developed within the irregular β grain. As the forging cycle increased to 44, the volume fraction of the fine and equiaxial β grain that is less than 20 μm, which is caused by dynamic recrystallization, increased gradually. However, the incomplete dynamic recrystallization region within the original β grain could not be eliminated. As the forging cycle further increased, the volume fraction of the fine and equiaxial β grain did not increase. In contrast, the abnormal grain growth of the β phase occurred during 50th~62nd forging cycle. Here, we attribute the formation of the incomplete dynamic recrystallization region and the abnormal grain growth of the β phase to the high deformation rate of the α + β forging. The refining behavior of β grain and the abnormal coursing β grain, which is found during the multi-cycle multi-axial forging of large-scale Ti-5553 alloy billet, are seldom reported in the isothermal compression of small-scale Ti-5553 alloy specimen. The findings of the paper are instructive for improving the sub-transus forging strategy that is used to fabricate the large-scale homogeneity Ti-5553 alloy billet with fine and equiaxial β grain.

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Section: Discussionmentioning

confidence: 99%

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

Qin

Liu

2023

Materials

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“…For bcc, the symmetry constraints and fit to elastic constants mean that agreement with experiment is exact for the slope at the Γ point, so the general similarity with neutron data is unsurprising and trends across the group can be readily seen. It is notable that Li and Na, which are unstable with respect to fcc at low temperature, have stable bcc phonon spectra, unlike other elements such as Ti and Zr, which are calculated to have negative bcc shear moduli at 0K 13,25,26 , and transform to bcc at high temperatures due to soft T1N modes. Figures 5 and 6 show phonon spectra for Li and Cs, other elements being similar (Supplemental Figure 3).…”

Section: Phononsmentioning

confidence: 99%

Property trends in simple metals: An empirical potential approach

Nichol

Ackland

2016

Phys. Rev. B

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We demonstrate that the melting points and other thermodynamic quantities of the alkali metals can be calculated based on static crystalline properties. To do this we derive analytic interatomic potentials for the alkali metals fitted precisely to cohesive and vacancy energies, elastic moduli, lattice parameter and crystal stability. These potentials are then used to calculate melting points by simulating the equilibration of solid and liquid samples in thermal contact at ambient pressure. With the exception of lithium, remarkably good agreement is found with experimental values. The instability of the bcc structure in Li and Na at low temperatures is also reproduced, and, unusually, is not due to a soft T1N phonon mode. No forces or finite temperature properties are included in the fit, so this demonstrates a surprisingly high level of intrinsic transferrability in the simple potentials. Currently, there are few potentials available for the alkali metals, so in addition to demonstrating trends in behaviour, we expect that the potentials will be of broad general use.

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“…In general, Ti and Ti alloys are quite attractive for aerospace, medical, and industrial applications [1][2][3][4], of which gamma-titanium aluminide (γ-TiAl) has been considered as one of the topmost candidates for high-temperature structural material due to its low density and high specific modulus and strength [5][6][7][8][9]. However, the intricate processing behavior, particularly the poor ductility and the low hot workability appears to be the main obstacle for a wide industrial application of γ-TiAl alloys [9].…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation Behavior of a β-Solidifying γ-TiAl-Based Alloy from Different Phase Regions with Various Cooling Methods

Xing

et al. 2018

Metals

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The phase transformation behavior of Ti-42Al-5Mn (at.%) alloy from different phase regions with various cooling rates was investigated based on electron probe micro analyzer-backscattered electrons (EPMA-BSE). It is shown that β→α2′ takes place when this alloy is cooled at a high rate, such as water quenching (WQ), oil cooling (OC), from β single phase. With the decreasing cooling rate to air cooling (AC), β→α2′ is restrained and β→γ is promoted by forming γ platelets. The room-temperature microstructure is βo + α2 when alloy cooled (WQ and OC) from (β + α) dual-phase. However, under AC, β→γ occurs and γ platelets form. It should be noted that α2→γ happens when this alloy cooled from 1180 °C (>Teut) by OC and AC, forming an incomplete lamellae (α2/γ) structure in the α2 phase. However, when the alloy cooled from 1100 °C (<Teut), α2/γ→βo,sec occurs and complete lamellae generates in α2 phase.

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Experimental and theoretical study of Ti-6Al-4V to 220 GPa

Cited by 15 publications

References 41 publications

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

β Grain Size Inhomogeneity of Large Scale Ti-5Al-5V-5Mo-3Cr Alloy Bulk after Multi-Cycle and Multi-Axial Forging in α + β Field

Property trends in simple metals: An empirical potential approach

Phase Transformation Behavior of a β-Solidifying γ-TiAl-Based Alloy from Different Phase Regions with Various Cooling Methods

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