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Fracture toughness and fatigue crack growth analysis of 7050-T7451 alloy thick plate with different thicknesses

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Abstract

The strength, fracture toughness and fatigue crack growth resistance of 7050-T7451 aluminum alloy plate with different thicknesses (35 mm and 160 mm) were investigated by means of optical microscope, scanning electron microscope and transmission electron microscope. The results show that thicker plate has lower strength and fracture toughness but higher fatigue crack growth resistance, by comparison to the thinner plate. The drop of strength is mainly attributed to grain coarsening in the thicker plate, and the increased degree of recrystallization results in the loss of K IC. However, the coarsened grains in the thicker plate make cracks deflected and closure effect enhanced due to surface roughness increased. For both of plates, in the fracture surface subjected plain strain, a transition from transgranular dimpled fracture to intergranular dimpled fracture is observed during the fracture process.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Yi-lin Wang  (王艺淋), Qing-lin Pan  (潘清林), Li-li Wei  (韦莉莉), Bo Li  (李波) & Ying Wang  (王迎)

  2. Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Central South University, Changsha, 410083, China

    Qing-lin Pan  (潘清林)

Authors
  1. Yi-lin Wang  (王艺淋)
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  2. Qing-lin Pan  (潘清林)
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  3. Li-li Wei  (韦莉莉)
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  4. Bo Li  (李波)
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  5. Ying Wang  (王迎)
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Corresponding author

Correspondence to Qing-lin Pan  (潘清林).

Additional information

Foundation item: Project(2012CB619503) supported by State Key Fundamental Research Program of China

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Wang, Yl., Pan, Ql., Wei, Ll. et al. Fracture toughness and fatigue crack growth analysis of 7050-T7451 alloy thick plate with different thicknesses. J. Cent. South Univ. 21, 2977–2983 (2014). https://doi.org/10.1007/s11771-014-2265-0

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  • DOI: https://doi.org/10.1007/s11771-014-2265-0

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