Achieving grain refinement and ultrahigh yield strength in laser aided additive manufacturing of Ti−6Al−4V alloy by trace Ni addition. Issue 4 (4th July 2021)

• Record Type: Journal Article
• Authors: Sui, Shang; Chew, Youxiang; Weng, Fei; Tan, Chaolin; Du, Zhenglin; Bi, Guijun
• Is Part Of: Virtual and physical prototyping. Volume 16:Issue 4(2021)
• Page Start: 417
• Page End: 427
• Publication Date: 2021-07-04
• Subjects: Nickel -- grain refining -- laser-based directed energy deposition -- titanium alloys -- mechanical properties; Rapid prototyping -- Periodicals; Virtual computer systems -- Periodicals; Prototypes, Engineering -- Periodicals; Production engineering -- Periodicals; Design, Industrial -- Periodicals; 670.285
• DOI: 10.1080/17452759.2021.1949091
• Languages: English
• ISSNs: 1745-2759

Abstract

ABSTRACT: Fabricating fine equiaxed grains without undesirable secondary phases is highly challenging for additively manufactured Ti−6Al−4V alloy. The reference amount of Ni addition, which can achieve grain refinement without secondary phase formation, is 0.9 wt. % based on Thermo-Calc calculation. The Ti−6Al−4V−0.9Ni alloy produced by laser-based directed energy deposition demonstrate refined microstructure and an ultrahigh yield strength (1309 MPa). A modified quantitative model is proposed to analyse the strengthening mechanism, and the results demonstrate that the yield strength increment is mainly ascribed to the refined α phase. This work can contribute to the development of customised titanium alloy using additive manufacturing.