Extraordinary strength-ductility synergy in a heterogeneous-structured β -Ti alloy through microstructural optimization

Autor:	Sumin Shin, Chaoyi Zhu, Cheng Zhang, Kenneth S. Vecchio
Jazyk:	angličtina
Rok vydání:	2019
Předmět:	heterogeneous structure gum metal geometrically necessary dislocation density strain partitioning Materials of engineering and construction. Mechanics of materials TA401-492
Zdroj:	Materials Research Letters, Vol 7, Iss 11, Pp 467-473 (2019)
Druh dokumentu:	article
ISSN:	2166-3831 21663831
DOI:	10.1080/21663831.2019.1652856
Popis:	This paper reports on a heterogeneous-structured β-Ti alloy with an exceptional combination of high strength and ductility, resulting from optimized hierarchical features in a lamellar microstructure. The microstructure is achieved by controlling a fraction of coarse/fine domains, spatial grain-size distribution, and different types of grain boundaries. The large degree of microstructural heterogeneity leads to obvious mechanical incompatibility and strain partitioning during plastic deformation. In addition, experimental results demonstrate that the unique heterogeneous structure induces high hetero-deformation induced hardening and promotes dislocation accumulation, thereby achieving a high yield strength ∼970 MPa and uniform tensile elongation of ∼16%.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/12e03c6560c04c90bb447a9cfa72bec1 Zobrazit plný text záznamu View record in DOAJ