Work

Superstrength of Nanostructured Ti Grade 4 with Grain Boundary Segregations

Year: 2025

Type: article

Abstract: Severe plastic deformation and subsequent heat treatments yield nanostructured commercially pure (CP) titanium Grade 4 with average grain size of about 100 nm and exceptional strength. To elucidate the underlying strengthening mechanisms in this nanotitanium (nanoTi), this study uses atom probe tomography (APT) to analyze the atomic structure of grain boundaries and assess impurity segregation. Results reveal the formation of grain boundary segregations, primarily composed of iron (Fe) atoms, reaching concentrations up to 3.3 ± 0.2 at% in localized regions. The average width of these segregation layers is 6.13 ± 0.45 nm. The paper considers a mechanism for forming these segregations and discusses relevant theoretical models describing their contribution to the material’s enhanced strength.

Source: Metals

DOI: 10.3390/met15060618

Authors: Emil I. Usmanov, Michail Yu. Gutkin, Yinxing Wu, Gang Sha, Ruslan Z. Valiev

Institutions: Ufa University of Science and Technology, Russian Academy of Sciences, Institute of Problems of Mechanical Engineering, Nanjing University of Science and Technology

Language: English

Topic: Microstructure and mechanical properties

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funder: Ministry of Education and Science of the Russian Federation