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Schlagwörter:
Equal channel angular pressing; Grain refinement; Grain size and shape; Linear transformations; Martensite; Niobium; Pressing (forming); Strain; Tantalum; Titanium alloys, Body-centred cubic; Grain size; High strains; Low strains; Matrix phase; Ultrafine grained materials; Ultrafine-grained Ti; Zr alloys, Martensitic transformations
Zusammenfassung:
We report on a novel phenomenon, that is a high-strain-induced reverse martensitic transformation in an ultrafine-grained Ti–36Nb–2Ta–3Zr (wt.) alloy processed by equal channel angular pressing (ECAP) at room temperature. Our results show that a martensitic transformation from body-centred cubic β matrix to orthorhombic α″ martensite occurs under low-strain ECAP conditions and that a large portion (~34) of martensite transforms into a matrix phase (i.e. reverse martensitic transformation) with increasing ECAP strain to a high value of 4 (i.e. 6 passes) with a corresponding reduction in the α″-lath thickness and a refinement of grain size in the matrix phase. © 2016 Informa UK Limited.