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Intermittent plasticity in individual grains: A study using high energy x-ray diffraction.

K Chatterjee1, A J Beaudoin, D C Pagan2

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This summary is machine-generated.

Plasticity in metals can be intermittent. This study links dislocation motion to stress relaxation in titanium and magnesium alloys using advanced X-ray diffraction, revealing significant stress fluctuations in Ti-7Al.

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Crystallography

Background:

  • Plasticity in metals is known to exhibit intermittent behavior.
  • Connecting microscopic dislocation dynamics to macroscopic stress relaxation in bulk polycrystals remains challenging.
  • Understanding these connections is crucial for predicting material failure and designing advanced alloys.

Purpose of the Study:

  • To investigate the link between dislocation motion and stress relaxation during plastic deformation.
  • To characterize intermittent plastic deformation events within individual grains of metallic alloys.
  • To compare the intermittent plasticity behavior of a titanium alloy (Ti-7Al) and a magnesium alloy (AZ31).

Main Methods:

  • Utilized high-energy X-ray diffraction (XRD) measurements.
  • Employed far-field high-energy diffraction microscopy to determine complete grain stress states.
  • Combined macroscopic stress relaxation data with rapid XRD spot measurements using a Mixed-Mode Pixel Array Detector.
  • Monitored dislocation content by analyzing the 3D evolution of XRD spot intensity distributions.

Main Results:

  • Observed significant stress fluctuations indicative of intermittent plastic flow in the Ti-7Al alloy.
  • Found that the AZ31 magnesium alloy exhibited a lesser degree of intermittent plastic flow compared to Ti-7Al.
  • Successfully linked changes in dislocation content within deforming grains to macroscopic stress relaxation events.

Conclusions:

  • High-energy X-ray diffraction is effective in characterizing intermittent plastic deformation at the grain level.
  • The Ti-7Al alloy demonstrates more pronounced intermittent plasticity than the AZ31 alloy.
  • This work provides direct evidence connecting microscopic dislocation behavior to macroscopic stress relaxation phenomena in metallic alloys.