Characteristic Features of Ultrafine-Grained Ti-45 wt.% Nb Alloy under High Cycle Fatigue

被引：4

作者：

Mairambekova, Aikol M. ^{[1
,2
]}

Eroshenko, Anna Y. ^{[1
]}

Oborin, Vladimir A. ^{[3
]}

Bannikov, Mikhail, V ^{[3
]}

Chebodaeva, Valentina V. ^{[1
]}

Terekhina, Alena, I ^{[3
]}

Naimark, Oleg B. ^{[3
]}

Dmitriev, Andrey, I ^{[1
]}

Sharkeev, Yurii P. ^{[1
,4
]}

机构：

[1] Inst Strength Phys & Mat Sci SB RAS, 2-4 Akademicheskii Pr, Tomsk 634055, Russia

[2] Natl Res Tomsk State Univ, Dept Solid Mech, Fac Phys & Engn, 36 Lenina Pr, Tomsk 634050, Russia

[3] Inst Continuous Media Mech UB RAS, Perm 614013, Russia

[4] Natl Res Tomsk Polytech Univ, Res Sch High Energy Phys, 30 Lenina Pr, Tomsk 634050, Russia

来源：

MATERIALS | 2021年 / 14卷 / 18期

关键词：

Ti-45; wt; % Nb alloy; ultrafine-grained structure; fatigue testing; surface morphology; Hurst exponent; infrared thermography method; TI-NB; TITANIUM-ALLOYS; METALLIC MATERIALS; GIGACYCLE FATIGUE; CRACK INITIATION; LOW MODULUS; GENERATION; HEAT; MICROSTRUCTURE; DEFORMATION;

D O I：

10.3390/ma14185365

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The paper presents the results of fatigue-testing ultrafine-grained and coarse-grained Ti-45 wt.% Nb alloy samples under very high cycle fatigue (gigacycle regime), with the stress ratio R = -1. The ultrafine-grained (UFG) structure in the investigated alloy was formed by the two-stage SPD method, which included multidirectional forging (abc-forging) and multipass rolling in grooved rollers, with further recrystallization annealing. The UFG structure of the Ti-45 wt.% Nb alloy samples increased the fatigue limit under the high-cycle fatigue conditions up to 1.5 times compared with that of the coarse-grained (CG) samples. The infrared thermography method was applied to investigate the evolution of temperature fields in the samples under cyclic loading. Based on numerical morphology analysis, the scale invariance (the Hurst exponent) and qualitative differences for UFG and CG structures were determined. The latter resulted from the initiation and propagation of fatigue cracks in both ultra-fine grained and coarse-grained alloy samples under very high-cycle fatigue loading.

引用

页数：21

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