Influence of Heat Treatment on Microstructures and Textures of Hot-Extruded Ni₄₇Ti₄₄Nb₉ Shape Memory Alloy Tubes

Abstract:

Microstructures and textures of the hot forged bar and hot-extruded tubes of Ni47Ti44Nb9 alloy as well as influence of heat treatment on them were studied in order to obtain a desired preferred orientation along the tube radial direction. The results show that B2 phase in hot-extruded tubes has a fine fibred shape and the main texture components are close to γ-fibre. Many fine recrystallized grains are formed for tubes heat treated at 600°C and γ-fibre is enhanced, which is beneficial to improving shape memory performances along the tube radial direction. Grain growth occurs at 850°C, and strong texture components deviate from γ-fibre.

• Periodical: Advanced Materials Research (Volume 214)
• Pages: 286-290
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.214.286
• Online since: February 2011
• Authors: Ying Yan, Wei Jin, Xiao Wu Li
• Keywords: Heat Treatment, Hot-Extruded Ni₄₇Ni₄₄Nb₉ Tube, Microstructure, Texture

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