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Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Large plasticity in magnesium mediated by pyramidal dislocations.

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Magnesium alloys can be strengthened for better energy efficiency. Submicrometer magnesium samples show improved ductility and strength by activating more dislocations on pyramidal planes.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Lightweight magnesium alloys are crucial for energy efficiency in transportation.
  • Limited ductility in magnesium hinders widespread application, often attributed to non-basal dislocations.
  • Enhancing magnesium's plasticity is key to unlocking its potential.

Purpose of the Study:

  • To investigate the role of non-basal (NP) dislocations in accommodating plastic strain in magnesium.
  • To explore the plasticity of submicrometer-sized magnesium samples.
  • To understand the relationship between crystal size, dislocation activity, and mechanical properties.

Main Methods:

  • In situ transmission electron microscope (TEM) mechanical testing.
  • Observation and analysis of dislocation gliding on pyramidal planes.
  • Comparison of mechanical properties between submicrometer and bulk magnesium samples.

Main Results:

  • Non-basal dislocations can accommodate significant plastic strain by gliding on pyramidal planes.
  • Submicrometer magnesium samples exhibit substantially higher plasticity compared to bulk counterparts.
  • Smaller crystal size leads to higher stress, activating more non-basal dislocations for enhanced plasticity and strength.

Conclusions:

  • The study demonstrates a mechanism for enhancing magnesium alloy ductility.
  • Submicrometer magnesium shows promise for high-strength and high-ductility applications.
  • Controlling crystal size is a viable strategy for improving magnesium's mechanical performance.