75 - Ultrastrong nanotwinned titanium alloys through additive manufacturing

Abstract

Additive manufacturing is leading a new era in metal fabrication across aerospace, automotive, biomedical and energy sectors due to its design freedom that can fabricate almost any geometrical part. Titanium alloys are presently the leading additively-manufactured metal components for the aerospace industry. However, most commercially available titanium alloys made by additive manufacturing do not have satisfactory properties for many structural applications. In this talk, we will present our recent breakthrough that ultrastrong and thermally stable titanium alloys can be produced by additive manufacturing, 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 1600 MPa are achieved - resulting in the highest strength-to-weight among all AM alloys to date. The excellent properties are attributed to the unusual formation of dense, stable and internally-twinned nanoprecipitates, that are rarely observed in the traditionally processed titanium alloy. These nano-twinned precipitates are shown to originate from a high density of dislocations with a dominant screw character and formed from the AM process. The work herein paves a way to fabricate structural materials with unique microstructures and excellent properties for broad applications.

Speaker

Aijun Huang

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Monash Centre for Additive Manufacturing, Monash University, Melbourne, Australia

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Conference

75 - Ultrastrong nanotwinned titanium alloys through additive manufacturing

Date/Time

20/03/2024

9:30 am -10:00 am

Location

Room 6