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Related Concept Videos

Fatigue01:21

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Fatigue-Assisted Grain Growth in Al Alloys.

R Goswami1, C R Feng2, S B Qadri2

  • 1Multifunctional Materials, Materials Science and Technology Division, Naval Research Laboratory, Washington DC, 20375, USA. ramasis.goswami@nrl.navy.mil.

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|September 2, 2017
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Summary

This study reveals significant grain growth at room temperature in microcrystalline aluminum alloy 7075 under fatigue loading. This phenomenon, driven by grain rotation and coalescence, impacts fatigue behavior and material lifetime predictions.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Metallurgy

Background:

  • Stress-assisted grain growth typically occurs in nanocrystalline materials at room temperature.
  • Larger grain sizes usually require higher homologous temperatures for stress-assisted grain growth.

Purpose of the Study:

  • To investigate grain growth in microcrystalline Al 7075 under fatigue loading at room temperature.
  • To elucidate the mechanisms and microstructural consequences of this observed grain growth.

Main Methods:

  • Experimental investigation of Al 7075 under cyclic fatigue loading at room temperature.
  • Microstructural analysis focusing on grain size, orientation, and texture evolution.

Main Results:

  • Significant grain growth observed in microcrystalline (≥10 μm) Al 7075 at room temperature under fatigue.
  • Grain growth mechanism identified as non-uniform, involving grain rotation and coalescence, distinct from thermal or stress-assisted growth.
  • Fatigue-assisted deformation led to the formation of a strong near-Cu {112}<111> texture component.

Conclusions:

  • Room temperature grain growth in microcrystalline Al 7075 under fatigue is a novel finding.
  • Microstructural changes (grain size, orientation, texture) are critical for understanding fatigue crack behavior.
  • These findings are essential for predicting the fatigue life of structural materials.