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Correction published on 26 November 2020, see Materials 2020, 13(23), 5364.
Open AccessArticle

Effect of Oxygen Variation on High Cycle Fatigue Behavior of Ti-6Al-4V Titanium Alloy

by 1, 1,2,*, 1,2, 1,2 and 1,2,*
1
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
2
National & Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials, Xi’an 710072, China
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(17), 3858; https://doi.org/10.3390/ma13173858
Received: 22 June 2020 / Revised: 19 August 2020 / Accepted: 19 August 2020 / Published: 1 September 2020
(This article belongs to the Special Issue Research on Fatigue Behavior of Metals and Alloys)
The element oxygen is expected to be a low-cost, strengthening element of titanium alloys due to its strong solid solution strengthening effect. High cycle fatigue behaviors of Ti-6Al-4V alloys with different oxygen contents (0.17%, 0.20%, 0.23% wt.%) were investigated in this paper. The results illustrated that Ti-6Al-4V-0.20O alloy possesses the highest fatigue strength and the lowest fatigue crack propagation rate. The fatigue fracture morphology verified that the fatigue cracks propagated transgranularly in both Ti-6Al-4V-0.17O and Ti-6Al-4V-0.20O alloys, and the fatigue cracks tended to extend intergranularly in the Ti-6Al-4V-0.23O alloy. The maximum nano-hardness varied from the <0001> direction to the <1¯21¯0> and <011¯0> directions with the increasing oxygen content, which suggested that the dominant slip system varied from prismatic slip to pyramidal slip. The number of the <c+a> type dislocations increased with the oxygen content, which indicated that the number of the first-order pyramidal and the second-order pyramidal <c+a> slip systems increased. The oxygen can significantly change the fatigue fracture mechanism of Ti-6Al-4V alloy: From transgranular fracture to intergranular fracture. These results are expected to provide valuable reference for the optimization of the composition and mechanical properties of titanium alloys. View Full-Text
Keywords: Ti-6Al-4V; oxygen; microstructural characteristic; high cycle fatigue behavior; failure mechanism Ti-6Al-4V; oxygen; microstructural characteristic; high cycle fatigue behavior; failure mechanism
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MDPI and ACS Style

Tang, L.; Fan, J.; Kou, H.; Tang, B.; Li, J. Effect of Oxygen Variation on High Cycle Fatigue Behavior of Ti-6Al-4V Titanium Alloy. Materials 2020, 13, 3858. https://doi.org/10.3390/ma13173858

AMA Style

Tang L, Fan J, Kou H, Tang B, Li J. Effect of Oxygen Variation on High Cycle Fatigue Behavior of Ti-6Al-4V Titanium Alloy. Materials. 2020; 13(17):3858. https://doi.org/10.3390/ma13173858

Chicago/Turabian Style

Tang, Luyao; Fan, Jiangkun; Kou, Hongchao; Tang, Bin; Li, Jinshan. 2020. "Effect of Oxygen Variation on High Cycle Fatigue Behavior of Ti-6Al-4V Titanium Alloy" Materials 13, no. 17: 3858. https://doi.org/10.3390/ma13173858

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