Work

Strain hardening mechanism induced by basal/pyramidal dislocation reactions in a 3D-printed high-strength titanium alloy

Year: 2024

Type: article

Abstract: The high yield ratio and low strain hardening ability of titanium alloys significantly limit their engineering applications. In this work, a Ti65Zr30Cu5 (at.%) alloy with nanoscale α laths was additively manufactured and achieved a high yield strength of 1274 MPa and a high strain hardening rate up to 40% of the shear modulus. Results show that universal basal/pyramidal dislocation reactions occur during the tensile deformation process. This triggers high-density sessile 〈c 〉 dislocation junctions, which accumulate and pin other mobile dislocations. Consequently, abundant dislocation walls are induced, leading to a strong hetero-deformation-induced strain hardening effect.

Source: Materials Research Letters

DOI: 10.1080/21663831.2024.2395433

Authors: Qiaodan Yan, Xin Lin, Jun Yu, Xufei Lu, Weidong Huang

Institutions: Northwestern Polytechnical University, State Key Laboratory of Solidification Processing

Language: English

Topic: Titanium Alloys Microstructure and Properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,459

Funder: National Key Research and Development Program of China