Hierarchical refinement of nickel-microalloyed titanium during additive manufacturing. (1st April 2021)

• Record Type: Journal Article
• Authors: Xiong, Zhihui; Pang, Xiaotong; Liu, Shilong; Li, Zhuguo; Misra, R.D.K.
• Is Part Of: Scripta materialia. Number 195(2021)
• Publication Date: 2021-04-01
• Subjects: Selective laser melting -- Titanium alloy -- Microalloying -- Eutectoid forming element -- Microstructure refinement; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.113727
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The remarkable microalloying effect of nickel (Ni) on grain refinement and strengthening of selective laser melted titanium alloy is elucidated here. The addition of Ni up to ~0.4 wt.% avoided the formation of brittle eutectoid Ti2 Ni phase and an ultrafine and ductile microstructure consisting of nano-size lath α′ was obtained in selective laser melted Ti-0.4Ni alloy. The solid solution strengthening and refinement effect of Ni led to significant increase in strength from ~745 MPa for pure Ti to ~1120 MPa for Ti-0.4Ni alloy, and good elongation of 8.8%. It is underscored that microalloying of titanium alloys with Ni can enhance the properties of titanium alloys processed by additive manufacturing. Graphical abstract: Image, graphical abstract