Evidence for deformation-induced phase transformation in a high Sn content zirconium alloy. (December 2018)

• Record Type: Journal Article
• Authors: Cochrane, C.; Gharghouri, M.A.; Daymond, M.R.
• Is Part Of: Acta materialia. Volume 161(2018)
• Page Start: 311
• Page End: 319
• Publication Date: 2018-12
• Subjects: Zirconium alloys -- Neutron diffraction -- EBSD -- Phase transformations -- Transformation-induced plasticity; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2018.09.034
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: The zirconium alloy Excel has been shown to retain a metastable β phase upon quenching from temperature within the α + β phase field. Using a combination of neutron diffraction and EBSD, we show that it is possible to initiate a phase transformation from β → α during tensile deformation of Excel in the quenched state. We present a model to explain the observed behaviour. EBSD results show that twin-like α laths are formed in the β grains during deformation. This β → α transformation shows a strong variant selection, as expected for a phase transformation that accommodates plastic strain. Secondary transformation laths were also observed which did not follow the expected variant rule. We present a simple model that explains quantitatively the behaviour of the β → α phase transformation during straining and accurately predicts the variant selection. Graphical abstract: Image 1