Characterization of the hot deformation behavior of a Ti–22Al–25Nb alloy using processing maps based on the Murty criterion

Ma, Xiong; Zeng, Weidong; Xu, Bin; Sun, Yu; Xue, Chengshan; Han, Yuanfei

doi:10.1016/j.intermet.2011.08.027

Cited by 89 publications

(29 citation statements)

References 31 publications

(38 reference statements)

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“…It is seen that at low temperatures and high strain rates, the flow stresses quickly increased to a peak value at a low plastic strain of about 0.005, and then sharply dropped to a relatively low value at a plastic strain of about 0.04. A similar phenomenon has been observed in Ti-6.8Mo-4.5Fe-1.5Al alloy [27], Ti 600 alloy [28] and Ti-22Al-25Nb alloy [29]. The sudden stress drop in the ZrTiAlV alloy may be associated with the disappearance of mobile dislocations in the grain boundaries during hot deformation [30].…”

Section: Stress-strain Curvessupporting

confidence: 74%

“…A significant serrate oscillation was observed at a high strain rate of 10 0 s À1 . The phenomena of serrated oscillation and continuous flow softening behavior can be attributed to dynamic recovery, deformation heating and flow instability [29]. For the fine-grained and coarsegrained alloys, the flow curves exhibited typical characteristics of dynamic recrystallization at low strain rates and high temperatures.…”

Section: Stress-strain Curvesmentioning

confidence: 99%

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Effect of initial grain size on the hot deformation behavior of 47Zr–45Ti–5Al–3V alloy

Tan

Liu

Duan

et al. 2014

Journal of Nuclear Materials

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Section: Stress-strain Curvessupporting

confidence: 74%

Section: Stress-strain Curvesmentioning

confidence: 99%

Effect of initial grain size on the hot deformation behavior of 47Zr–45Ti–5Al–3V alloy

Tan

Liu

Duan

et al. 2014

Journal of Nuclear Materials

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“…In the processing maps, the microstructure morphology of the flow instability region including flow localization, mechanical twinning and kinking. Correspondingly, DRV, DRX and spheroidizing are typical microstructure evolutions that are observed in the stability regions [29,[32][33]. Fig.…”

Section: Hot Deformed Microstructurementioning

confidence: 73%

“…Severe stress concentration causes flow localization. Moreover, extremely rapid strain rate does not allow on-time release of heat, which increases localized temperature [29].…”

Section: Processing Mapmentioning

confidence: 99%

Hot deformation behavior and the processing map of Zr–1.0Be alloy in single α phase

Feng

Jiang

Zhou

et al. 2015

Progress in Natural Science: Materials International

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The hot deformation behavior, hot workability and dynamic recrystallization evolution of Zr-1.0 (wt%) Be alloy in single α phase were investigated by conducting hot compression tests. The strain rates ranging from 10 -3 s -1 to 101 s -1 and testing temperatures varying from 650 1C to 850 1C were used. Flow stress was found to increase with increasing strain rate and decrease with the increment of the deformation temperature. A constitutive equation of flow behavior was established to describe the dependence of flow stress on strain rate and deformation temperature. The activation energy for deformation of Zr-1.0Be alloy was determined to be Q ¼301 kJ/mol. The processing map of Zr-1.0Be alloy was constructed at strain rates ranging from 10 -3 s -1 to 101 s -1 and deformation temperatures varying from 650 1C to 850 1C at the true strain of 0.7. A processing map was used to identify the best domains of thermal processing, including a domain at a temperature of 650 1C and strain rate of 10 -3 s -1 , as well as another domain at deformation temperatures ranging from 800 1C to 850 1C and strain rates varying from 10 -3 s -1 to 10 -1 s -1 . Microscopic analysis of Zr-1.0Be alloy showed that the flow instability and kink were very obvious at low temperatures and high strain rates. At high temperatures and low strain rates, the dynamic recrystallization became the main softening mechanism during hot working.

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“…After the sudden stress drop, the flow stress decreased slowly as the deformation proceeded. The continuous flow softening behavior can be attributed to dynamic recovery, deformation heating and flow instability [22]. With decreasing strain rate and increasing deformation temperature, the phenomenon of stress drop disappeared gradually, and the type of flow curves was transformed into the dynamic recrystallization-type curve.…”

Section: True Stress-strain Curvesmentioning

confidence: 99%

Hot deformation behavior of 51.1Zr–40.2Ti–4.5Al–4.2V alloy in the single β phase field

Duan

Tan

et al. 2015

Progress in Natural Science: Materials International

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The hot deformation behavior of a newly developed 51.1Zr-40.2Ti-4.5Al-4.2 V alloy was investigated by compression tests in the deformation temperature range from 800 to 1050 1C and strain rate range from 10 À 3 to 10 0 s À 1 . At low temperatures and high strain rates, the flow curves exhibited a pronounced stress drop at the very beginning of deformation, followed by a slow decrease in flow stress with increasing strain. The magnitude of the stress drop increased with decreasing deformation temperature and increasing strain rate. At high temperatures and low strain rates, the flow curves exhibited typical characteristics of dynamic recrystallization. A hyperbolic-sine Arrhenius-type equation was used to characterize the dependences of the flow stress on deformation temperature and strain rate. The activation energy for hot deformation decreased slightly with increasing strain and then tended to be a constant value. A microstructural mechanism map was presented to help visualize the microstructure of this alloy under different deformation conditions.

show abstract

Characterization of the hot deformation behavior of a Ti–22Al–25Nb alloy using processing maps based on the Murty criterion

Cited by 89 publications

References 31 publications

Effect of initial grain size on the hot deformation behavior of 47Zr–45Ti–5Al–3V alloy

Effect of initial grain size on the hot deformation behavior of 47Zr–45Ti–5Al–3V alloy

Hot deformation behavior and the processing map of Zr–1.0Be alloy in single α phase

Hot deformation behavior of 51.1Zr–40.2Ti–4.5Al–4.2V alloy in the single β phase field

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