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Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity
Zhang, JR; Shah, SAA; Hao, YL; Li, SJ; Yang, R; Hao, YL (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
2018-04-01
Source PublicationSCIENCE CHINA-MATERIALS
ISSN2095-8226
Volume61Issue:4Pages:537-544
AbstractIt is well known that metallic materials exhibit worse fatigue damage tolerance as they behave stronger in strength and softer in modulus. This raises concern on the long term safety of the recently developed biomechanical compatible titanium alloys with high strength and low modulus. Here we demonstrate via a model alloy, Ti-24Nb-4Zr-8Sn in weight percent, that this group of multifunctional titanium alloys possessing nonlinear elastic deformation behavior is tolerant in fatigue notch damage. The results reveal that the alloy has a high strength-to-modulus (sigma/E) ratio reaching 2% but its fatigue notch sensitivity (q) is low, which decreases linearly from 0.45 to 0.25 as stress concentration factor increases from 2 to 4. This exceeds significantly the typical relationship between sigma/E and q of other metallic materials exhibiting linear elasticity. Furthermore, fatigue damage is characterized by an extremely deflected mountain-shape fracture surface, resulting in much longer and more tortuous crack growth path as compared to these linear elastic materials. The above phenomena can be explained by the nonlinear elasticity and its induced stress relief at the notch root in an adaptive manner of higher stress stronger relief. This finding provides a new strategy to balance high strength and good damage tolerance property of metallic materials.; It is well known that metallic materials exhibit worse fatigue damage tolerance as they behave stronger in strength and softer in modulus. This raises concern on the long term safety of the recently developed biomechanical compatible titanium alloys with high strength and low modulus. Here we demonstrate via a model alloy, Ti-24Nb-4Zr-8Sn in weight percent, that this group of multifunctional titanium alloys possessing nonlinear elastic deformation behavior is tolerant in fatigue notch damage. The results reveal that the alloy has a high strength-to-modulus (sigma/E) ratio reaching 2% but its fatigue notch sensitivity (q) is low, which decreases linearly from 0.45 to 0.25 as stress concentration factor increases from 2 to 4. This exceeds significantly the typical relationship between sigma/E and q of other metallic materials exhibiting linear elasticity. Furthermore, fatigue damage is characterized by an extremely deflected mountain-shape fracture surface, resulting in much longer and more tortuous crack growth path as compared to these linear elastic materials. The above phenomena can be explained by the nonlinear elasticity and its induced stress relief at the notch root in an adaptive manner of higher stress stronger relief. This finding provides a new strategy to balance high strength and good damage tolerance property of metallic materials.
description.department[zhang, jinrui ; shah, syed a. a. ; hao, yulin ; li, shujun ; yang, rui] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china ; [zhang, jinrui] univ sci & technol china, sch mat sci & engn, shenyang 110016, liaoning, peoples r china
KeywordHigh-cycle Fatigue Modulus Ti-24nb-4zr-8sn Alloy Plastic-deformation Crack Deflection Stainless-steel Carbon Steels Nano-scale Behavior Ti-6al-4v Microstructure
Subject AreaMaterials Science, Multidisciplinary
Funding OrganizationNational Key Research and Development Program of China [2016YFC1102601, 2017YFC1104901]; National Natural Science Foundation of China [51571190, 51631007]; Key Research Program of Frontier Sciences of Chinese Academy of Sciences [QYZDJ-SSW-JSC031]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79382
Collection中国科学院金属研究所
Corresponding AuthorHao, YL (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, JR,Shah, SAA,Hao, YL,et al. Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity[J]. SCIENCE CHINA-MATERIALS,2018,61(4):537-544.
APA Zhang, JR,Shah, SAA,Hao, YL,Li, SJ,Yang, R,&Hao, YL .(2018).Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity.SCIENCE CHINA-MATERIALS,61(4),537-544.
MLA Zhang, JR,et al."Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity".SCIENCE CHINA-MATERIALS 61.4(2018):537-544.
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