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Related Concept Videos

Phase Transitions02:31

Phase Transitions

Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Shock Waves01:16

Shock Waves

While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
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A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...

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Unexpected Observation of Disorder and Multiple Phase-Transition Pathways in Shock-Compressed Zr.

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Dynamic compression of metals reveals complex shear-relief mechanisms. Shocked zirconium (Zr) shows disorder-mediated relaxation and multiple pathways during structural phase transitions under high pressure.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • High-Pressure Physics

Background:

  • Materials under dynamic compression exhibit diverse behaviors due to complex deformation mechanisms relieving shear stresses.
  • Understanding these mechanisms is crucial for predicting material responses under extreme conditions.

Purpose of the Study:

  • To investigate the intricate competition between multiple shear-relieving mechanisms in an elemental metal under shock compression.
  • To reveal the dynamic response of single-crystal zirconium (Zr) during shock-induced phase transitions.

Main Methods:

  • Utilized femtosecond X-ray diffraction synchronized with nanosecond laser compression.
  • Performed multimillion-atom molecular dynamics simulations with a machine-learned interatomic potential for Zr.

Main Results:

  • Observed disorder-mediated shear relaxation in shocked Zr at lower pressures.
  • Identified an increasing contribution of structural phase transition to shear stress relief above the transition pressure.
  • Detected three concurrent pathways during the hexagonal close-packed (hcp) to hexagonal-3 (hex-3) structure transition.

Conclusions:

  • The dynamic response of metals under shock compression is more intricate than previously assumed, involving multiple concurrent pathways.
  • Disorder plays a significant role in shear relaxation during dynamic compression of metals.