Effect of structural states in near-surface layers of commercial titanium on its fatigue life and fatigue fracture mechanisms |
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| Authors: | V E Panin T F Elsukova Yu F Popkova Yu I Pochivalov Sunder Ramasubbu |
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| Institution: | 1.Institute of Strength Physics and Materials Science, Siberian Branch,Russian Academy of Sciences,Tomsk,Russia;2.National Research Tomsk Polytechnic University,Tomsk,Russia;3.Bangalore Integrated System Solutions Pvt. Ltd.,Peenya Industrial Area,Bangalore,India |
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| Abstract: | Changes of structural states in near-surface layers of α-titanium strongly affect its fatigue life and fatigue fracture mechanisms. In α-titanium subjected to alternate bending a sliding mode crack develops, resulting in slight delamination of the material. Hydrogenation of α-titanium surface layers preserves their sliding mode cracking but greatly enhances their delamination. Nanostructuring of α-titanium surface layers increases their nanohardness and elastic modulus and causes opening mode cracking. The fatigue life of the material after surface hydrogenation decreases three times, and after surface nanostructuring, it increases four times. |
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