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High-Cycle Fatigue Behaviour of Ultrafine Grained 5052 Al Alloy Processed Through Cryo-Forging

  • K. K. YogeshaEmail author
  • Amit Joshi
  • Raviraj
  • A. Raja
  • R. Jayaganthan
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Mechanical properties of ultrafine grained 5052 Al alloy processed through multi-directional forging were investigated in the present work. The as-received 5052 Al alloy was solution-treated (ST) at temperature 540 ℃ for two hours and subjected to multi axial forging at room temperature as well as liquid N2 temperature to a cumulative true strain of 4.2. The cryo-forged samples have exhibited a significant improvement in strength (380 MPa) and hardness (130 Hv) with 7.1% ductility, as compared to other conditions. Similarly, the high-cycle fatigue behaviour of the cryo-forged samples is found to be 80 MPa, which is better than other conditions. It was due to the formation of ultrafine grained microstructure with an average grain size of 230 nm in the cryo-forged samples. The formation of nanoshear bands in the cryo-forged samples, which accommodates the applied strain during cyclic loading is also responsible for dislocation accumulation along with broken/deformed impurity phase particles. The microstructure of the samples was characterized by optical microscopy, X-ray diffraction, and TEM to substantiate the mechanisms of grain refinement and its influence on the mechanical properties. Fractography of the tensile, as well as fatigue, tested samples were carried out using a Scanning Electron Microscope (SEM) to reveal the type of fracture.

Keywords

Ultrafine grains Microstructure Characterization Fractography 

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • K. K. Yogesha
    • 1
    • 2
    Email author
  • Amit Joshi
    • 1
    • 3
  • Raviraj
    • 1
  • A. Raja
    • 1
  • R. Jayaganthan
    • 1
    • 4
  1. 1.Department of Metallurgical and Materials Engineering and Centre of NanotechnologyIndian Institute of Technology RoorkeeRoorkeeIndia
  2. 2.Department of Mechanical EngineeringNational Institute of EngineeringMysoreIndia
  3. 3.Department of Mechanical EngineeringG. B. Pant Institute of Engineering and Technology Pauri (Garhwal)Pauri (Garhwal)India
  4. 4.Department of Engineering DesignIndian Institute of Technology MadrasChennaiIndia

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