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Erschienen in: Metals and Materials International 8/2023

21.01.2023

Effect of Bimodal Grain Structure on the Yielding Behavior of Commercial Purity Titanium Under Quasi-static Tension

verfasst von: Xianzhe Shi, Xiuxia Wang, Biao Chen, Junko Umeda, Katsuyoshi Kondoh, Jianghua Shen

Erschienen in: Metals and Materials International | Ausgabe 8/2023

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Abstract

In this work, a bimodal grain structure was developed for commercial purity Ti(CP-Ti) via powder metallurgy processing, followed by free hot forging and then heat treatment. The bi-modal grains were characterized with electron backscatter diffraction. The mechanical tests showed that in comparison to the uniform and equiaxed grain structure, the bimodal grains improved the yield strength of CP-Ti significantly, while it maintains a merely changed ultimate tensile strength and elongation to failure. In addition, an interesting yield plateau was observed in the bimodal CP-Ti. To explore underlying mechanisms behind the phenomenon, the microstructures of the samples before and after testing were carefully examined. The results revealed that geometrically necessary dislocations accumulating at the interface between coarse and fine grains induced back stress hardening, which together with the statistically stored dislocations also accounted for the yield plateau in the bimodal CP-Ti.

Graphical abstract

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Metadaten
Titel
Effect of Bimodal Grain Structure on the Yielding Behavior of Commercial Purity Titanium Under Quasi-static Tension
verfasst von
Xianzhe Shi
Xiuxia Wang
Biao Chen
Junko Umeda
Katsuyoshi Kondoh
Jianghua Shen
Publikationsdatum
21.01.2023
Verlag
The Korean Institute of Metals and Materials
Erschienen in
Metals and Materials International / Ausgabe 8/2023
Print ISSN: 1598-9623
Elektronische ISSN: 2005-4149
DOI
https://doi.org/10.1007/s12540-022-01373-8

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