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Low-Cycle Fatigue Behavior of an As-Extruded AM50 Magnesium Alloy

  • SYMPOSIUM: Deformation & Fracture from Nano to Macro: Honoring W.W. Gerberich’s 70th Birthday
  • Published:
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The low-cycle fatigue behavior of an as-extruded AM50 magnesium alloy has been investigated. The cyclic stress response of the alloy strongly depends on the imposed strain amplitude. It is also noted that at the higher total strain amplitudes, the alloy exhibits a pronounced anisotropic deformation behavior in the direction of tension and compression, where the width of the σ-ε hysteresis loop in the compressive direction is greater than that in the tensile direction. At the total strain amplitude of 1.5 pct, a serrated flow can be observed in both tensile and compressive directions of the σ-ε hysteresis loop. This means that dynamic strain aging takes place during fatigue deformation. The relation between elastic and plastic strain amplitudes with reversals to failure shows a monotonic linear behavior and can be well described by the Basquin and Coffin–Manson equations, respectively. In addition, crack initiation and propagation modes are suggested, based on scanning electron microscopy observations on the fracture surfaces of fatigued specimens.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110023, Liaoning, People’s Republic of China

    Lijia Chen (Professor), Chunyan Wang (Instructor), Wei Wu (Graduate Student) & Zheng Liu (Professor)

  2. Materials Science and Engineering Department, The University of Tennessee, Knoxville, TN, 37996-2200, USA

    Grigoreta M. Stoica (Graduate Student), Liang Wu (Graduate Student) & Peter K. Liaw (Professor and Ivan Racheff Chair of Excellence)

Authors
  1. Lijia Chen
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  2. Chunyan Wang
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  3. Wei Wu
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  4. Zheng Liu
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  5. Grigoreta M. Stoica
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  6. Liang Wu
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Correspondence to Lijia Chen.

Additional information

This article is based on a presentation given in the symposium entitled “Deformation and Fracture from Nano to Macro: A Symposium Honoring W.W. Gerberich’s 70th Birthday,” which occurred during the TMS Annual Meeting, March 12–16, 2006, in San Antonio, Texas, and was sponsored by the Mechanical Behavior of Materials and Nanomechanical Behavior Committees of TMS.

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Chen, L., Wang, C., Wu, W. et al. Low-Cycle Fatigue Behavior of an As-Extruded AM50 Magnesium Alloy. Metall Mater Trans A 38, 2235–2241 (2007). https://doi.org/10.1007/s11661-007-9181-y

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  • DOI: https://doi.org/10.1007/s11661-007-9181-y

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