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Related Concept Videos

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Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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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?
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Temperature Dependent Deformation01:12

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Residual Stresses01:26

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Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
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Thermal Stress01:09

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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
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Ultrastrong Negative Thermal Expansion Compositionally Complex Alloy.

Junming Gou1, Yun Pan1, Xiaolian Liu2

  • 1Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

This study introduces a novel Fe-Co-Ni-Ti alloy with negative thermal expansion (NTE) properties. The new material offers a unique combination of strength, ductility, and a wide temperature range for temperature-invariant composites.

Keywords:
compositionally complex alloylocal chemical orderingmechanical propertiesnegative thermal expansion

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid State Physics

Background:

  • Negative thermal expansion (NTE) materials are vital for creating strong metallic composites with stable volumes across temperature fluctuations.
  • Existing NTE materials often lack sufficient strength, ductility, or exhibit undesirable thermal hysteresis over broad temperature ranges.

Purpose of the Study:

  • To develop a novel alloy exhibiting significant NTE over a wide temperature range with enhanced mechanical properties.
  • To investigate the relationship between microstructure and the observed NTE and mechanical behavior.

Main Methods:

  • Compositional design of a complex Fe-Co-Ni-Ti alloy.
  • Microstructural characterization to understand phase transformations and nanoscale ordering.
  • Mechanical testing (compressive strength) and thermal expansion measurements.

Main Results:

  • The Fe-Co-Ni-Ti alloy demonstrates large NTE over a wide temperature range with minimal thermal hysteresis.
  • Achieved ultrahigh compressive strength up to 2.64 GPa, coupled with modest ductility.
  • Unique microstructure featuring a sluggish thermoelastic martensitic transformation in the matrix and strengthening secondary phases.

Conclusions:

  • The developed alloy offers a promising solution for high-performance functional materials requiring temperature stability and mechanical robustness.
  • The study highlights a new design strategy for advanced materials by controlling microstructural features and local chemical ordering.