Effects of severe plastic deformation on grain refinement and martensitic transformation in a metastable β Ti alloy

A. Zafari, X. S. Wei, W. Xu, K. Xia

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Abstract

A Ti-5553 metastable β alloy was subjected to high pressure torsion (HPT) to obtain a nano β grain structure. The β grains were dramatically refined from an initial size of ∼1 mm to < 50 nm during HPT. The stress induced martensitic α plates divided β grains into smaller domains and enabled subgrains to form even in very fine grains. The reverse α to β transformation occurred when the thickness of the α laths reached < ∼10 nm, leading to pure β nano-grains. Further deformation to an equivalent strain of 242 resulted in grain growth and the formation of well defined grain boundaries.

Original languageEnglish
Article number012055
Number of pages7
JournalIOP Conference Series: Materials Science and Engineering
Volume89
DOIs
Publication statusPublished - 2015
EventInternational Symposium on Materials Science (36th : 2015) - Risø, Denmark
Duration: 7 Sep 201511 Sep 2015
Conference number: 36th

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