Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 35, Issue 15, Pages 1789-1802Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670836.2019.1651954
Keywords
Texture; Grain size; Slipping bands; Fatigue crack propagation; Twist angle; Crack deflection; Crack closure; Aluminium alloys
Funding
- Hubei Provincial Natural Science Foundation of China [2018 CFB177]
- PhD research startup foundation of Hubei University of Automotive Technology [BK201702]
- Key Laboratory of Automotive Power Train and Electronics (Hubei University of Automotive Technology)
- National Key Research and Development Program of China [2016YFB0300901]
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Texture or grain orientation was of crucial importance to fatigue crack propagation (FCP) in aluminium alloys due to boundary character between neighbouring grains and crack closure effect. The current understanding of the relationship among texture, grain size, slipping and crack propagation at fatigue stage I to III was reviewed and discussed. The recommendations for improving FCP resistance were proposed. Intensifying Goss, P and Q textures and moderating these grains were an effective method to improve FCP resistance in Paris regime. However, in stage I, due to the predominated crack closure effect, large grain is beneficial for improving the threshold value of crack propagation. Principally, excellent FCP resistance could be obtained at a balance of crack deflection and crack closure.
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