Effects of severe plastic deformation on grain refinement and martensitic transformation in a metastable β Ti alloy. Issue 1 (July 2015)

• Record Type: Journal Article
• Authors: Zafari, A; Wei, X S; Xu, W; Xia, K
• Is Part Of: IOP conference series. Volume 89:Issue 1(2015)
• Publication Date: 2015-07
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/89/1/012055
• Languages: English
• ISSNs: 1757-8981

Abstract

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.