Fracture toughness at cryogenic temperatures of ultrafine-grained Ti-6Al-4V alloy processed by ECAP

被引：43
|
作者：
Semenova, Irina P. [1 ]
Modina, Julia M. [1 ]
Polyakov, Alexander V. [1 ,2 ]
Klevtsov, Gennady V. [3 ]
Klevtsova, Nataly A. [3 ]
Pigaleve, Irina N. [3 ]
Valiev, Ruslan Z. [1 ,2 ]
Langdon, Terence G. [4 ]
机构：
[1] Ufa State Aviat Tech Univ, 12 K Marx St, Ufa 450008, Russia
[2] St Petersburg State Univ, 7-9 Univ Skaya Nab, St Petersburg 199034, Russia
[3] Togliatti State Univ, 14 Belorusskaya Str, Tolyatti 445667, Samara Region, Russia
[4] Univ Southampton, Fac Engn & Environm, Mat Res Grp, Southampton SO17 1BJ, Hants, England
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 716卷
基金：
欧洲研究理事会;
关键词：
Cryogenic temperatures; Duplex ultrafine-grained structure; Fracture toughness; Titanium alloy; Uniform elongation; SEVERE PLASTIC-DEFORMATION; MECHANICAL-PROPERTIES; FATIGUE BEHAVIOR; TITANIUM-ALLOY; DUCTILITY; STRENGTH; NANOCRYSTALLINE; METALS; REFINEMENT; PARADOX;
D O I：
10.1016/j.msea.2017.12.106
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This research is focused on a study of the relationship between mechanical behavior, microstructure and fracture toughness of a Ti-6Al-4V alloy in both coarse-grained (CG) and ultrafine-grained (UFG) conditions. The UFG state with a primary alpha-phase grain size, but with different orientations with respect to the testing direction, was produced by equal-channel angular pressing (ECAP) after thermo-mechanical treatment. Fracture toughness and mechanical testing were conducted at a temperature of - 196 degrees C. A duplex UFG structure formation in the Ti-6Al-4V alloy led to an enhancement of yield stress and a decrease in the fracture toughness at - 196 degrees C by comparison with the CG alloy. The lowest values of fracture toughness were observed in a sample in which there were elongated grains lying parallel to the loading direction during testing compared to the situation where the grains were perpendicular to this direction. The reasons for the reduction in fracture toughness in the UFG Ti alloy are discussed.
引用
收藏
页码：260 / 267
页数：8
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