Role of crystallographic orientation on the deformation behaviour of Ti-6Al-4V alloy during low cycle fatigue

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Pub Date : 2023-01-10 DOI:10.1080/14786435.2022.2163716

R. Vinjamuri, P. Dwivedi, R. Sabat, K. Dutta, M. Kumar, S. K. Sahoo

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Abstract

ABSTRACT Low cycle fatigue (LCF) tests were carried out on Ti6Al4V alloy at room temperature for different strain amplitudes ranging from 0.5% to 2%. The microstructure and texture evolutions as a function of strain amplitude have been investigated in the present study. Cyclic softening behaviour was observed at all strain amplitudes, and it was found to increase with increasing the strain amplitude. The fatigue transition life was observed to be at 1.25% strain amplitude. Only type tensile twins were formed during the deformation, and this was found to be significant at higher strain amplitude of 2%. The grains along were appeared to be the twinning parent, and the twinned products were appeared along [0001]. The grains were further found to have substantial cyclic deformation than the other grains, such as and [0001]. The dominant texture was found along during the LCF tests. However, the sample at higher strain amplitude of 2% had also prominent [0001] texture along with texture. Fractographic examination revealed a dimple fracture surface at lower strain amplitude (0.5%), whereas a quasi-cleavage type fracture was observed at higher strain amplitudes (1% & 2%).

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晶体取向对Ti-6Al-4V合金低周疲劳变形行为的影响

摘要:对Ti6Al4V合金进行了0.5% ~ 2%不同应变幅值的室温低周疲劳试验。本文研究了应变幅值对组织和织构演化的影响。在所有应变幅值下均观察到循环软化行为，且随应变幅值的增加而增加。疲劳过渡寿命为1.25%应变幅值。变形过程中只形成了类型的拉伸孪晶，当应变幅值达到2%时，这一现象更为显著。沿上的晶粒为孪晶亲本，孪晶产物沿上[0001]出现。进一步发现，与和[0001]等其他晶粒相比，这些晶粒具有明显的循环变形。优势织构在LCF测试中被发现。而在较高应变幅值为2%时，随着织构的出现，样品也有明显的[0001]织构。断口形貌分析显示，在较低应变幅值(0.5%)处为韧窝断口，而在较高应变幅值(1%和2%)处为准解理断口。

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来源期刊

Philosophical Magazine 工程技术-材料科学：综合

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审稿时长

4.7 months

期刊介绍： The Editors of Philosophical Magazine consider for publication contributions describing original experimental and theoretical results, computational simulations and concepts relating to the structure and properties of condensed matter. The submission of papers on novel measurements, phases, phenomena, and new types of material is encouraged.