Header menu link for other important links
X
Influence of hot rolling and evolved microstructure on high cycle fatigue behaviour of Mg-4Zn-4Gd alloy
Published in Elsevier Inc.
2020
Volume: 160
   
Abstract
The high cycle fatigue behaviour of bulk nanostructured Mg-4Zn-4Gd magnesium alloy, produced through hot rolling with different reductions such as 50% (corresponding true strain, εT −0.693), 75% (εT, −1.386) and 85% (εT, −1.897) was investigated. The solution treatment of the alloy was performed at 673 K for 24 h in order to achieve equiaxed microstructure prior to rolling. The microstructural characteristics of the alloy were examined through light microscopy. The influence of several microstructural features such as dislocation, deformation twins, micro/nano-precipitate, and ultrafine grains on tensile and hardness behaviour is used to understand fatigue life (Nf) of the processed material. Along with microstructural aspects, the effects of varying applied stress amplitude (σa) and cyclic hardening zone were also analysed to quantify its influence on fatigue life of the rolled materials. The 75% hot rolled specimen has shown maximum fatigue life (i.e. ≥ 1.5 × 106) at 75 MPa stress amplitude. The associated fracture mechanism was explored through scanning electron fractography for the specimen subjected to HCF regime. All the fatigue influencing factors were characterised by using transmission electron microscopy along with X-ray results. © 2019 Elsevier Inc.
About the journal
JournalData powered by TypesetMaterials Characterization
PublisherData powered by TypesetElsevier Inc.
ISSN10445803
Open AccessNo
Concepts (25)
  •  related image
    Energy dispersive x ray analysis
  •  related image
    Fractography
  •  related image
    FRACTURE MECHANICS
  •  related image
    Gadolinium alloys
  •  related image
    Hardening
  •  related image
    High resolution transmission electron microscopy
  •  related image
    Hot rolling
  •  related image
    Magnesium alloys
  •  related image
    Scanning electron microscopy
  •  related image
    Ternary alloys
  •  related image
    Textures
  •  related image
    Twinning
  •  related image
    X ray analysis
  •  related image
    X ray diffraction analysis
  •  related image
    X rays
  •  related image
    Zinc alloys
  •  related image
    CYCLIC HARDENING
  •  related image
    EQUIAXED MICROSTRUCTURES
  •  related image
    Fracture mechanisms
  •  related image
    High cycle fatigue
  •  related image
    MICRO-STRUCTURAL CHARACTERISTICS
  •  related image
    Microstructural aspects
  •  related image
    Microstructural features
  •  related image
    Processed materials
  •  related image
    Fatigue of materials