Abstract
A spontaneous transformation has been observed in thin foils of metastable β-phase (b.c.c.) niobium 16–60% zirconium alloys during electro-polishing. The product has a f.c.c. crystal structure and a plate-like morphology. The transformation is governed by the concentration of both hydrogen, which has to exceed a critical value and zirconium. Consequently the spontaneously formed plates are only stable at room temperature in foils where the zirconium concentration exceeds 40%. The hydride plates have a habit plane close to {133} β and contain either slip dislocations, stacking faults or fine twins on {111} h planes or mixtures of these. The orientation relationship between the hydride plates and the β-matrix corresponds closely with the Kurdjumov-Sachs relationship. Complex interactions between plates result in a further transformation which has been interpreted as a reverse transformation (f.c.c. → b.c.c.). The results have been considered in terms of the phenomenological crystallographic theory for martensite formation. Satisfactory agreement between theory and experiment has been established.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
