Effect of Severe Plastic Deformation on the Structure and State of Grain Boundaries in Niobium

被引：0

作者：

Popov, V. V. ^{[1
]}

Popova, E. N. ^{[1
]}

Osinnikov, E. V. ^{[1
]}

机构：

[1] RAS, MN Miheev Inst Met Phys, Ural Branch, Ekaterinburg 620108, Russia

来源：

METALS AND MATERIALS INTERNATIONAL | 2025年 / 31卷 / 07期

关键词：

Niobium; Severe plastic deformation; High-pressure torsion; Grain boundaries; Microhardness; Scanning tunneling microscopy; HIGH-PRESSURE TORSION; THERMAL-STABILITY; NB; EVOLUTION; DIFFUSION; ENERGY; TEMPERATURE; NICKEL; ALLOYS; MICROSTRUCTURE;

D O I：

10.1007/s12540-024-01871-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of severe plastic deformation by high-pressure torsion (HPT) on the formation of nanocrystalline structure in niobium has been studied by the methods of transmission electron microscopy, scanning tunneling microscopy, X-ray diffraction analysis and microhardness measurements. The thermal stability of the resulting structure has been analyzed. Specific features of grain boundaries (GBs) formed under the severe plastic deformation have been considered and analyzed. It is demonstrated that a considerable fraction of these boundaries are in the so-called nonequilibrium, or deformation-modified state, characterized by higher free energy and larger free volume in comparison with those of common relaxed GBs. It has been shown that contribution of nonequilibrium GBs to total strengthening is relatively small.

引用

页码：2069 / 2081

页数：13

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