An in-situ neutron diffraction investigation of martensitic transformation in a metastable β Ti-10V-2Fe-3Al alloy during uniaxial tension

• Published in: Journal of alloys and compounds Vol. 869; p. 159301
• Main Authors: Pinilla Ducreux, Carla Isabel, Saleh, Ahmed A., Gazder, Azdiar A., Pereloma, Elena V.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 15.07.2021; Elsevier BV
• Subjects: Alloys; Beta titanium; Deformation; Lattice parameters; Martensite; Martensitic transformations; Neutron diffraction; Neutron diffraction (ND); Neutrons; Rietveld refinement; Titanium base alloys; Transformation induced plasticity (TRIP); Transformation induced plasticity (TRIP); Rietveld refinement; Neutron diffraction (ND); Martensite; Beta titanium
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.159301

•~0.75 fraction of α″ martensite forms before the peak of work hardening rate.•α″ martensite formation leads to a dynamic Hall-Petch effect.•α″ accommodates strain via a decrease and increase in a and b lattice parameters, respectively.•Rhombicity of α″ martensite affects the accommodation of deformation. The deformation behaviour of a metastable β Ti-10V-2Fe-3Al (wt%) alloy containing ~10 vol% α phase was investigated via single-peak fitting and Rietveld refinement of in-situ neutron diffraction data collected during uniaxial tension. The formation of the 021α″ fibre is related to martensite variant selection during β → α″ transformation under applied load. The β lattice parameter increases by ~0.08% during tension whereas α″ accommodates deformation through a decrease and increase in a and b lattice parameters, respectively. The origin of the variation in α″ martensite lattice parameters with strain for different Ti alloys is linked to their different rhombicity values.