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.
|Number of pages||7|
|Journal||IOP Conference Series: Materials Science and Engineering|
|Publication status||Published - 2015|
|Event||International Symposium on Materials Science (36th : 2015) - Risø, Denmark|
Duration: 7 Sep 2015 → 11 Sep 2015
Conference number: 36th