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Related Concept Videos

Thermal expansion and Thermal stress: Problem Solving01:27

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
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If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Adaptive Volume Control in Titanium Alloy for High Temperature Performance.

Pei Li1, Xun Sun2,3, Tianlong Zhang2

  • 1State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.

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This study reveals that Ti-10V-2Fe-3Al alloy volume changes during isothermal aging due to a pseudospinodal decomposition mechanism. This volume alteration offers a method to compensate for fastener material loss.

Keywords:
Ti-1023 alloyadaptive volumehigh temperature performanceisothermal

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Area of Science:

  • Materials Science
  • Metallurgy
  • Physical Chemistry

Background:

  • Fastener failure can be exacerbated by material shrinkage over time at fixed temperatures.
  • Understanding and controlling material volume changes during aging is crucial for structural integrity.

Purpose of the Study:

  • To investigate the volume change behavior of Ti-10V-2Fe-3Al alloy during isothermal aging.
  • To elucidate the underlying mechanisms responsible for volume alterations.
  • To explore the potential of this phenomenon for compensating volume loss in applications.

Main Methods:

  • Isothermal aging of Ti-10V-2Fe-3Al alloy at 550 °C.
  • Volume/length change measurements over time.
  • Transmission electron microscopy (TEM) for microstructural analysis.
  • Energy dispersive spectrometer (EDS) analysis for elemental composition.
  • First-principle calculations to model phase transitions and diffusion.

Main Results:

  • The alloy exhibited an initial volume shrinkage followed by abnormal volume expansion during isothermal aging.
  • TEM revealed no significant coarsening of the intragranular alpha phase.
  • EDS analysis showed diffusion of beta stabilizers (V, Fe) into the beta matrix and segregation of alpha stabilizers (Al) to the alpha phase.
  • First-principle calculations supported the volume change mechanism, linking initial shrinkage to beta to alpha phase transition and later expansion to elemental diffusion.

Conclusions:

  • Isothermal aging of Ti-10V-2Fe-3Al alloy induces a unique volume change behavior driven by pseudospinodal decomposition.
  • The observed volume expansion can potentially compensate for material loss, offering a self-fitting mechanism.
  • Understanding the interplay between phase transformation and elemental diffusion is key to controlling alloy volume stability.