Influence of heat treatments on microstructure and mechanical properties of Ti-26Nb alloy elaborated in situ by laser additive manufacturing with Ti and Nb mixed powder

Wei, J, Sun, H, Zhang, D, Gong, L and Wen, C 2018, 'Influence of heat treatments on microstructure and mechanical properties of Ti-26Nb alloy elaborated in situ by laser additive manufacturing with Ti and Nb mixed powder', Materials, vol. 12, no. 1, pp. 1-13.


Document type: Journal Article
Collection: Journal Articles

Title Influence of heat treatments on microstructure and mechanical properties of Ti-26Nb alloy elaborated in situ by laser additive manufacturing with Ti and Nb mixed powder
Author(s) Wei, J
Sun, H
Zhang, D
Gong, L
Wen, C
Year 2018
Journal name Materials
Volume number 12
Issue number 1
Start page 1
End page 13
Total pages 13
Publisher MDPIAG
Abstract In the present work, a Ti-26Nb alloy was elaborated in situ by laser additive manufacturing (LAM) with Ti and Nb mixed powders. The alloys were annealed at temperatures ranging from 650 �C to 925 �C, and the effects of the annealing temperature on the microstructure and mechanical properties were investigated. It has been found that the microstructure of the as-deposited alloy obtained in the present conditions is characterized by columnar prior � grains with a relatively strong < 001 > fiber texture in the build direction. The as-deposited alloy exhibits extremely high strength, and its ultimate tensile strength and yield strength are about 799 MPa and 768 MPa, respectively. The annealing temperature has significant effects on the microstructure and mechanical properties of the alloys. Annealing treatment can promote the dissolution of unmelted Nb particles and eliminate the micro-segregation of Nb at the elliptical-shaped grain boundaries, while increasing the grain size of the alloy. With an increase in annealing temperature, the strength of the alloy decreases but the ductility increases. The alloy annealed at 850 �C exhibits a balance of strength and ductility.
Subject Biomaterials
Metals and Alloy Materials
Keyword(s) Heat treatment
In situ alloying
Laser additive manufacturing
Mechanical properties
Microstructure
Ti-Nb alloy
DOI - identifier 10.1016/j.jallcom.2019.03.136
Copyright notice © 2018 by the authors. Licensee MDPI, Basel, Switzerland. Creative Commons Attribution (CC BY) license
ISSN 1996-1944
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