Microstructure and martensitic transformation of TiNiNbB shape memory alloys. (September 2015)

• Record Type: Journal Article
• Authors: Wang, Y.; Zheng, Y.F.; Tong, Y.X.; Tian, B.; Chen, F.; Li, L.
• Is Part Of: Intermetallics. Volume 64(2015:Sep.)
• Page Start: 32
• Page End: 36
• Publication Date: 2015-09
• Subjects: A. Shape–memory alloys -- B. Martensitic transformation -- B. Mechanical properties -- B. Shape–memory effects -- D. Microstructure; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2015.04.013
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: In present work, microstructure, martensitic transformation and mechanical properties of Ti44 Ni47−x Nb9 Bx (x = 0, 0.5, 1, 5 at.%) alloys were investigated as a function of B content. The results show that the addition of B significantly influences the microstructure of the alloys. The microstructure of Ti44 Ni47 Nb9 alloy consists of B2 parent phase matrix and β-Nb phase. When the B content is 0.5 at.%, Nb3 B2 phase presents. With further increasing B content to above 1 at.%, TiB and NbB phases present instead of Nb3 B2 phase. With increasing B content, the transformation temperatures increase due to the reduced Ni/Ti ratio and Nb content in the matrix. The mechanical properties can be optimized by the addition of 1 at.% B. Highlights: Microstructure of Ti44 Ni47−x Nb9 Bx alloys depend on B content. With increasing B content, transformation temperature increase. The optimized mechanical properties can be obtained by the proper addition of B.