Flow stress behavior and deformation characteristics of Ti-3Al-5V-5Mo compressed at elevated temperatures

Li, L.X; Lou, Yan; Yang, Lei; Peng, Da; Rao, K.P.

doi:10.1016/s0261-3069(02)00025-0

Cited by 96 publications

(29 citation statements)

References 11 publications

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“…Recently, this phenomenon has been reported in some α + β and near α titanium alloys. For instance, Li et al and Wang et al [14,15] discovered the discontinuous flow stress drop in α + β alloy Ti-3Al-5V-5Mo and TC8, respectively. In addition, Jia et al [10] demonstrated the behavior in near α alloy of Ti60.…”

Section: Discontinuous Yielding Behaviormentioning

confidence: 99%

“…Generally, the discontinuous yield phenomenon could be explained mainly by two theories: static theory and dynamic theory. The first theory involved the dislocation locking and unlocking, and the second one associated discontinuous yielding with the abrupt formation of large quantities of new mobile dislocations originated from the grain boundary sources [14]. For titanium alloys, more researchers indicated that the discontinuous yielding should be attributed to dynamic theory, rather than static theory during hot compression at elevated temperatures [12,16,17].…”

Section: Discontinuous Yielding Behaviormentioning

confidence: 99%

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Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Wang

Jin

et al. 2017

Metals

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Abstract:The isothermal compression experiment of as-rolled Ti-55 alloy was carried out on a Gleeble-3800 thermal simulation test machine at the deformation temperature range of 700-1050 • C and strain rate range of 0.001-1 s −1 . The hot deformation behavior and the microstructure evolution were analyzed during thermal compression. The results show that the apparent activation energy Q in α + β dual-phase region and β single-phase region were calculated to be 453.00 KJ/mol and 279.88 KJ/mol, respectively. The deformation softening mechanism was mainly controlled by dynamic recrystallization of α phase and dynamic recovery of β phase. Discontinuous yielding behavior mainly occurred in β phase region, which weakened gradually with the increase of deformation temperature (>990 • C) and strain rate (0.01-1 s −1 ) in β phase region. The processing map derived from Murty's criterion was more accurate in predicting the hot workability than that derived from Prasad's criterion. The optimized hot working window was 850-975 • C/0.001-1 s −1 , in which sufficient dynamic recrystallization occurred and α + β-transus microstructure was obtained. When deformed at higher temperature (≥1000 • C), coarsened lath-shape β-transus microstructure was formed, while deformed at lower temperature (≤825 • C) and higher strain rate (≥0.1 s −1 ), the dynamic recrystallization was not sufficient, thus flow instability appeared because of shear cracking.

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Section: Discontinuous Yielding Behaviormentioning

confidence: 99%

Section: Discontinuous Yielding Behaviormentioning

confidence: 99%

Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Wang

Jin

et al. 2017

Metals

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“…[27] Similar tendencies have also been reported for other alloys, including Ti alloys and Ni-based superalloys. [15,28,29] This is thought to be because DRX is more a dominant deformation mechanism than dynamic recovery, which is diffusion limited. [28] On the other hand, precipitation effects have been observed in Ni-based superalloys [15] and Mg-Al-Zn alloys.…”

Section: A Relationship Between Deformation Conditions and Drx Behaviormentioning

confidence: 99%

Ultrafine Grain Refinement of Biomedical Co-29Cr-6Mo Alloy during Conventional Hot-Compression Deformation

Yamanaka

Mori

Kurosu

et al. 2009

Metall Mater Trans A

117

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In order to examine the microstructural evolution during hot-compression deformation of the biomedical Co-29Cr-6Mo (weight percent) alloy without the addition of Ni, hot-compression tests have been conducted at deformation temperatures ranging from 1050°C to 1200°C at various strain rates of 10 À3 to 10 s À1 . The grain refinement due to dynamic recrystallization (DRX) was identified under all deformation conditions by means of field-emission scanning electron microscopy/electron backscattered diffraction (FESEM/EBSD) and transmission electron microscopy (TEM) observations. Although the DRX grain size (d) of the deformed specimens considerably decreased with an increasing Zener-Hollomon (Z) parameter at strain rates ranging from 10 À3 to 0.1 s À1 , a grain size coarser than that predicted from the d-Z relation was obtained at strain rates of 1.0 and 10 s À1 . An ultrafine-grained microstructure with a grain size of approximately 0.6 lm was obtained under deformation at 1050°C at 0.1 s À1 , from an initial grain size of 40 lm. The grain refinement to a submicron scale of biomedical Co-Cr-Mo alloys has been achieved with hot deformation by~60 pct due to DRX, in which the bulging mechanism is not operative. The ultrafine grains obtained due to DRX without bulging is closely related to the considerably low stacking-fault energy (SFE) of the Co-Cr-Mo alloy at deformation temperatures.

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“…The results of relevant studies indicate that titanium alloys with lamellar a starting microstructure usually have a relatively high activation energy value during hot deformation under certain conditions [25,35,36]. This result is usually attributed to globularization of the starting lamellar microstructure.…”

mentioning

confidence: 99%

An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

Zhu

Lai

et al. 2013

Materials & Design (1980-2015)

102

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a b s t r a c tIsothermal tensile tests have been performed to study the deformation mechanisms and microstructure evolution of Ti-6Al-2Zr-1Mo-1V titanium alloy in the temperature range 750-850°C and strain rate range 0.001-0.1 s À1. The deformation activations have been calculated based on kinetics rate equation to investigate the hot deformation mechanism. Microstructures of deformed samples have been analyzed by electron backscatter diffraction (EBSD) to evaluate the influences of hot deformation parameters on the microstructure evolution and recrystallization mechanism. The results indicate that deformation mechanisms vary with deformation conditions: at medium (800°C) and high (850°C) temperature, the deformation is mainly controlled by the mechanisms of dislocation creep and self-diffusion, respectively. The microstructure globularization mechanisms also depend on deformation temperature: in the temperature range from 750 to 800°C, the high angle grain boundaries are mainly formed via dislocation accumulation or subgrain boundaries sliding and subgrains rotation; while at high temperature of 850°C, recrystallization is the dominant mechanism. Especially, the evolution of the recrystallization mechanism with the deformation temperature is first observed and investigated in TA15 titanium alloy.

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Flow stress behavior and deformation characteristics of Ti-3Al-5V-5Mo compressed at elevated temperatures

Cited by 96 publications

References 11 publications

Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Study on Hot Deformation Behavior and Microstructure Evolution of Ti55 High-Temperature Titanium Alloy

Ultrafine Grain Refinement of Biomedical Co-29Cr-6Mo Alloy during Conventional Hot-Compression Deformation

An experimental study of deformation mechanism and microstructure evolution during hot deformation of Ti–6Al–2Zr–1Mo–1V alloy

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