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

Autor:	Qiaodan Yan, Xin Lin, Jun Yu, Xufei Lu, Weidong Huang
Jazyk:	angličtina
Rok vydání:	2024
Předmět:	Laser direct energy deposition titanium alloys basal-pyramidal dislocation reactions hetero-deformation-induced strain hardening nanostructure Materials of engineering and construction. Mechanics of materials TA401-492
Zdroj:	Materials Research Letters, Vol 12, Iss 11, Pp 852-859 (2024)
Druh dokumentu:	article
ISSN:	21663831 2166-3831
DOI:	10.1080/21663831.2024.2395433
Popis:	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.
Databáze:	Directory of Open Access Journals
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