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<p>FeCrAl alloy is an excellent candidate material for Generation IV nuclear reactors. To investigate the difference in tensile properties of a powder metallurgy (PM)-fabricated FeCrAl alloy after isostatic pressure treatment at different temperatures, in situ tensile tests were conducted at room temperature, 500 and 700&#xa0;°C. Attempt was made to clarify the correlation between microstructural evolution and tensile behavior. Then, tensile properties and fracture behavior of the PM-alloy at different temperatures were compared. Results shows that, compared to the case at room temperature, strain hardening of the alloy at 500&#xa0;°C decreased markedly, while it disappeared at 700&#xa0;°C. It is revealed that this is probably due to the transition in deformation mechanism from dynamic recovery to dynamic recrystallization. Moreover, the fracture mechanism of the material undergoes a significant transition with increasing temperature. Specifically, a mixed fracture was observed at room temperature and 500&#xa0;°C, that is quasi-cleavage on the periphery, while transgranular ductile at the center. In contrast, intergranular and ductile fracture appeared at 700&#xa0;°C. In situ defect characterization suggests that the formation of a small number of dimples within the specimen at 500&#xa0;°C induced ductile fracture and peripheral quasi-cleavage fracture. With the occurrence of plastic deformation in the necking stage at 700&#xa0;°C, a large number of dimples in the intergranular gradually coalescence to cause localized intergranular fracture.</p>

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Effect of Temperature on the Tensile Deformation and Fracture Behavior of Powder Metallurgy FeCrAl Alloy after Isostatic Pressure Treatment

  • 期刊论文

  • 发表日期：

    2026年2月8日

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  • Chenwei Zhang,
  • Fanhao Yue,
  • Tao Wang,
  • Kun Zhang,
  • Xuehua He,
  • Hongchang Wang,
  • Ling Li,
  • Shiyi Bao,
  • Lijia Luo,
  • Yibin Tang,
  • Wei Qin,
  • Xujia Wang

摘要

FeCrAl alloy is an excellent candidate material for Generation IV nuclear reactors. To investigate the difference in tensile properties of a powder metallurgy (PM)-fabricated FeCrAl alloy after isostatic pressure treatment at different temperatures, in situ tensile tests were conducted at room temperature, 500 and 700 °C. Attempt was made to clarify the correlation between microstructural evolution and tensile behavior. Then, tensile properties and fracture behavior of the PM-alloy at different temperatures were compared. Results shows that, compared to the case at room temperature, strain hardening of the alloy at 500 °C decreased markedly, while it disappeared at 700 °C. It is revealed that this is probably due to the transition in deformation mechanism from dynamic recovery to dynamic recrystallization. Moreover, the fracture mechanism of the material undergoes a significant transition with increasing temperature. Specifically, a mixed fracture was observed at room temperature and 500 °C, that is quasi-cleavage on the periphery, while transgranular ductile at the center. In contrast, intergranular and ductile fracture appeared at 700 °C. In situ defect characterization suggests that the formation of a small number of dimples within the specimen at 500 °C induced ductile fracture and peripheral quasi-cleavage fracture. With the occurrence of plastic deformation in the necking stage at 700 °C, a large number of dimples in the intergranular gradually coalescence to cause localized intergranular fracture.