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In-situ investigation on tensile deformation and fracture behaviors of Ti60 alloy rolled sheet with equiaxed microstructure

Wang, Boning ; Zeng, Weidong ; Zhao, Zibo ; Jia, Runchen ; Xu, Jianwei ; Wang, Qingjiang

Journal of alloys and compounds, 2022-11, Vol.923, p.166464, Article 166464 [Periódico revisado por pares]

Lausanne: Elsevier B.V

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  • Título:
    In-situ investigation on tensile deformation and fracture behaviors of Ti60 alloy rolled sheet with equiaxed microstructure
  • Autor: Wang, Boning ; Zeng, Weidong ; Zhao, Zibo ; Jia, Runchen ; Xu, Jianwei ; Wang, Qingjiang
  • Assuntos: Coordinated deformation ; Crack initiation ; Crack propagation ; Deformation mechanisms ; Dislocation density ; Electron backscatter diffraction ; Equiaxed structure ; Equiaxed α grain ; Fracture mechanics ; Grain boundaries ; In-situ tensile ; Lamellar structure ; Metal sheets ; Microstructure ; Nucleation ; Scanning electron microscopy ; Slip ; Stress concentration ; Tensile deformation ; Tensile tests ; Ti60 alloy ; Titanium base alloys
  • É parte de: Journal of alloys and compounds, 2022-11, Vol.923, p.166464, Article 166464
  • Descrição: In this work, the deformation mechanism and fracture behavior of Ti60 alloy sheet with equiaxed microstructure (the volume fraction of equiaxed α grains is 68%) using the in-situ tensile test were studied by in-situ scanning electron microscope (SEM) and electron backscattering diffraction (EBSD). The results show that equiaxed α grains activate three coordinated deformation mechanisms, mainly single slip mode, supplemented by slip transfer and grain rotation. The alloy is mainly coordinated by equiaxed α grain deformation, dominated by prismatic< a> and basal< a> slip, and prismatic slip in (101̅0) plane and [12̅10] direction as the most active slip system. With the increase of deformation, the soft oriented equiaxed α grains preferentially occur prismatic slip, while some hard oriented grains rotate in the direction favorable to slip. When there is no slip transfer between adjacent grains, dislocation pile-up at the grain boundary and causes stress concentration, which makes the grain boundary easy to become the crack nucleation point. In SEM and EBSD studies, lamellar α grains have no obvious deformation characteristics. However, TEM study found that some lamellar α grains were kinked, which led to lamellar fracture and the formation of high-density dislocation areas around them. Meanwhile, due to the large difference in coordinated deformation ability between equiaxed α grains and lamellar α grains and between equiaxed α hard and soft oriented grains. Therefore, cracks are initiated, propagated and fractured mainly at the junction of the α colony composed of lamellar α grains and at the equiaxed α grain boundary. •The deformation is coordinated mainly by slip, slip transfer and grain rotation.•The equiaxed α grains have no slip trace passing through the lamellar α grains through the grain boundary.•Cracks mainly occur at colony junctions of lamellar α grain composition and at equiaxed α grain boundaries.
  • Editor: Lausanne: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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