Fig. 1 a Solution treatment and warm compression, b schematic diagram of the fresh sample and warm compressed sample, c cross section of deformed specimen for BSE and EBSD observations

Fig. 2 EPMA images of precipitates for as-forged alloy: a FeCrAl, b FeCrAl-Zr

Fig. 3 BSE images of FeCrAl and FeCrAl-Zr alloys: a forged FeCrAl alloy, b FeCrAl solution-annealed at 1150 °C for 2 h, c forged FeCrAl-Zr

Fig. 4 Flow stress curves of FeCrAl a and FeCrAl-Zr alloys b

Fig. 5 Peak stress under different deformation conditions of FeCrAl and FeCrAl-Zr alloys

Fig. 6 Microstructures of FeCrAl a, b, FeCrAl-Zr c, d deformed at 600 °C/0.01 s-1 with different magnifications

Fig. 7 Microstructure of FeCrAl a, b, FeCrAl-Zr c, d deformed at 600 °C/1 s-1 with different magnifications

Fig. 8 EBSD recrystallization grain distributions of FeCrAl a, b, FeCrAl-Zr c, d deformed at 600 °C/0.01 s-1 a, c, 600 °C/1 s-1 b, d (blue grains represent recrystallized grain, yellow grains represent recovery grain, and red grains represent deformed grain)

Fig. 9 Ordinary grain boundary distributions in FeCrAl a, b, FeCrAl-Zr c, d alloy deformed at 600 °C and 0.01 s-1 (blue and red lines correspond to HAGBs and LAGBs)

Fig. 10 Percentage of grain boundaries of FeCrAl and FeCrAl-Zr alloys

Fig. 11 CSL boundaries distribution and content of FeCrAl a, b, FeCrAl-Zr c, d alloys deformed at 600 °C and 0.01 s-1

Fig. 12 Percentage of CSL grain boundaries in FeCrAl and FeCrAl-Zr alloys

Fig. 13 IPF maps and the corresponding {110} PF of red part in FeCrAl alloy a, FeCrAl-Zr alloy b deformed at 600 °C and 0.01 s-1