Effect of strain on microstructural development during uniaxial compression of metastable beta Ti–10V–2Fe–3Al alloy

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Materials Science and Engineering A


The effect of strain during uniaxial compression on mechanical behavior of Ti–10V–2Fe–3Al alloy produced by blended elemental powder metallurgy and containing a metastable β matrix with ~0.1 fraction of α phase was investigated. A detailed scanning transmission electron microscopy study revealed the initiation of slip and deformation-induced α′′ martensite and ω formation at the beginning of plastic deformation in the stress plateau region of stress-strain curve. {332}<113> twinning occurred at a later stage. Deformation-induced ω formed in the β matrix and within {332}<113> twins, but was consumed by other deformation products at strains exceeding 0.2. Formation of {112}<111> twins within {332}<113> twins and along their interfaces with the matrix was uncovered. The rate of development of deformation products among the β phase grains was non-uniform with many being fully transformed to α′′ martensite by 0.4 strain, whereas others experienced deformation conditions related to stress plateau region (<0.1 strain) and were only partially transformed. Formation of deformation-induced nanoscale ω at the α′′ martensite/β interface was found only in the sample with more stable β matrix due to 0.26 fraction of α being present. This was related to a higher rigidity of the β phase resulting from the higher levels of alloying elements. This induced the triggering of β→ω transformation by stresses arising from α′′ martensite formation. D D D

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Australian Research Council



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