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Ultrastrong nanotwinned titanium alloys through additive manufacturing

journal contribution
posted on 2023-02-20, 22:27 authored by Y Zhu, K Zhang, Z Meng, Peter HodgsonPeter Hodgson, N Birbilis, M Weyland, HL Fraser, SCV Lim, H Peng, R Yang, H Wang, A Huang
Titanium alloys, widely used in the aerospace, automotive and energy sectors, require complex casting and thermomechanical processing to achieve the high strengths required for load-bearing applications. Here we reveal that additive manufacturing can exploit thermal cycling and rapid solidification to create ultrastrong and thermally stable titanium alloys, which may be directly implemented in service. As demonstrated in a commercial titanium alloy, after simple post-heat treatment, adequate elongation and tensile strengths over 1,600 MPa are achieved. The excellent properties are attributed to the unusual formation of dense, stable and internally twinned nanoprecipitates, which are rarely observed in traditionally processed titanium alloys. These nanotwinned precipitates are shown to originate from a high density of dislocations with a dominant screw character and formed from the additive manufacturing process. The work here paves the way to fabricate structural materials with unique microstructures and excellent properties for broad applications.

History

Journal

Nature Materials

Volume

21

Pagination

1258-1262

Location

England

ISSN

1476-1122

eISSN

1476-4660

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Issue

11

Publisher

NATURE PORTFOLIO