Evolution of grain boundary and texture in as-forged Ti–45Al–9Nb–Y alloy during tensile test at different temperature

Zhang, Shuzhi; Kong, Fantao; Chen, Yuyong; Liu, Zuyan; Lin, Junpin

doi:10.1016/j.intermet.2012.01.011

Cited by 15 publications

(1 citation statement)

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“…The stability domain generally represents the optimum deformation condition, which corresponds to certain softening mechanisms, including DRV, DRX, and superplasticity. Previous studies show that the deformation of TiAl alloys are generally conducted at 1250–1300 °C to avoid cracking [35]. This indicates that the hot working window of the Ti–43Al–3Mn–2Nb–0.1Y alloy was broadened due to the addition of Mn and Nb.…”

Section: Resultsmentioning

confidence: 99%

Hot Deformation Behavior and Microstructural Evolution of a Novel β-Solidifying Ti–43Al–3Mn–2Nb–0.1Y Alloy

Cui

Xiao

et al. 2019

Materials

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In this paper, the hot deformability and mechanical properties of a novel Mn- and Nb- containing TiAl alloy were studied systematically with the use of isothermal compression experiments. The results show that the alloy has low deformation resistance and a low activation energy (392 KJ/mol), suggesting that the alloy has good hot deformability. A processing map was established, which shows that the present alloy has a smaller instability region and wider hot working window compared with other TiAl alloys. Microstructural observation shows that the initial lamellae completely transformed into fine equiaxial γ grains when the alloy was compressed at 1200 °C/0.01 s−1, which corresponds to the optimum deformation condition. Based on the above results, an intact TiAl billet was successfully fabricated by one-step large deformation using a four-column hydraulic machine. The microstructure of the billet is almost completely composed of recrystallized γ grains with large angle boundaries. Tensile testing shows the billet exhibits high tensile strength (780 MPa) and high elongation (1.44%) simultaneously, which benefits from fine γ grains with an average size of 4.9 μm. The ductile–brittle transition temperature is between 750–800 °C.

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Section: Resultsmentioning

confidence: 99%