Hot deformation behavior of Zr–1Nb alloy: Characterization by processing map

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

“…There is extensive research on the hot deformation behavior of Zr and Zr alloys for determination of the optimum hot working condition [10][11][12][13][14][15][16][17]. Chakravartty et al [10,11] found that dynamic recrystallization occurred in commercially pure a-Zr deformed in the temperatures range of 730-850°C and 10 À2 to 1 s À1 and Zircaloy-2 deformed at temperatures from 730 to 830°C and strain rates from 10 À2 to 2 s À1 .…”

“…Zr-1Nb-1Sn alloy exhibited different deformation behaviors during hot deformation, i.e., dynamic recovery in the a phase field, dynamic recrystallization in the a + b phase field, and large-grain superplasticity in the b phase field at strain rates less than 10 À2 s À1 [15]. Sarkar and Chakravartty [16] reported that dynamic recrystallization occurred at the temperatures from 625 to 800°C and strain rate lower than 0.1 s À1 in the a + b phase field of Zr-1Nb alloy, while dynamic recovery occurred in the b phase field. The hot deformation behavior of 47Zr-45Ti-5Al-3V alloy with a coarse grain structure in the b phase field has been investigated [17].…”

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

“…In Zircaloy-2, dynamic recrystallization occurred in the temperature range from 730 to 830 1C and strain rate range from 10 À 2 to 2 s À 1 [13]. In Zr-1Nb alloy, dynamic recrystallization occurred in the temperature range from 625 to 800 1C and strain rates lower than 0.1 s À 1 in the α and αþ β phase field, and dynamic recovery occurred in the β phase field [17]. For 47Zr-45Ti-5Al-3V alloy, dynamic recovery occurred at low temperatures and high strain rates, whereas dynamic recrystallization occurred at high temperatures and low strain rates in the β phase field [18].…”

“…There are many researches on the hot deformation behavior of Zr alloys [12][13][14][15][16][17][18][19]. In commercially pure α-Zr, dynamic recrystallization occurred in the temperature range from 730 to 850 1C and strain rate range from 10 À 2 to 1 s À 1 [12].…”

“…Moreover, a dramatic phenomenon of stress drop was observed in the 47Zr-45Ti-5Al-3V alloy. The flow behavior of the Zr alloy was different from that of the other Zr alloys [14,17,19]. As one of the newly-developed ZrTiAlV alloys, 51.1Zr-40.2Ti-4.5Al-4.2V alloy has an excellent combination of high yield strength and fracture toughness at room temperature [20].…”