超细晶粒钛的高强度状态及其强化机理

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Physical Mesomechanics Pub Date : 2023-10-12 DOI:10.1134/S1029959923050016

E. I. Usmanov, L. R. Rezyapova, R. Z. Valiev

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摘要

本文讨论了在室温下通过高压扭转进行剧烈塑性变形并随后进行热处理的商业纯4级钛中超细晶粒（UFG）结构和纳米级第二相沉淀物的形成。研究发现，4级钛的联合加工提供了非常高的抗拉强度（σB≈1500 MPa），这大大超过了该材料之前的结果。对强化机制的分析表明，商业纯钛的超强度是由几个因素引起的：UFG结构的形成、第二相纳米颗粒的分散强化、高位错密度和晶界偏析。对这些强化机制的贡献进行了评估，并与实验数据进行了比较。

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High-Strength State and Strengthening Mechanisms of Ultrafine-Grained Titanium

This paper discusses the formation of ultrafine-grained (UFG) structure and nanosized second-phase precipitates in commercially pure Grade 4 titanium subjected to severe plastic deformation by high pressure torsion at room temperature with subsequent heat treatment. It was found that the combined processing of Grade 4 titanium provides very high tensile strength (σ_B ≈ 1500 MPa), which significantly exceeds the previous results for this material. Analysis of the strengthening mechanisms showed that the superstrength of commercially pure titanium is due to several factors: UFG structure formation, dispersion strengthening from second-phase nanoparticles, high dislocation density, and grain boundary segregation. The contribution of these strengthening mechanisms is evaluated and compared with experimental data.

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来源期刊

Physical Mesomechanics Materials Science-General Materials Science

CiteScore

3.50

自引率

18.80%

发文量

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.