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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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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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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
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Updated: Mar 28, 2026

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A lightweight zero thermal expansion magnesium alloy.

Yadong Huang1,2, Sujuan Wu3,4,5, Zhihua Dong1,2

  • 1College of Materials Science and Engineering, Chongqing University, Chongqing, China.

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|March 27, 2026
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Summary

Researchers developed a lightweight alloy with zero thermal expansion, significantly reducing volume change. This breakthrough in thermal stability offers a new principle for dimensionally stable metals.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid State Physics

Background:

  • Thermal expansion is a critical challenge for dimensional stability in lightweight alloys.
  • Low atomic mass in lightweight materials can enhance lattice vibrations, exacerbating thermal expansion issues.

Purpose of the Study:

  • To develop a lightweight alloy with significantly reduced thermal expansion.
  • To achieve zero thermal expansion (ZTE) in a rare-earth magnesium alloy.

Main Methods:

  • A strain recovery compensation strategy was employed.
  • Al-stabilized MnCoGe particles were embedded in a rare-earth magnesium alloy (1.2 vol.%).

Main Results:

  • Achieved a three-orders-of-magnitude reduction in thermally induced volume change.
  • Reduced the coefficient of thermal expansion from 28 × 10⁻⁶ °C⁻¹ to 0.02 × 10⁻⁶ °C⁻¹ (25-150 °C).
  • The alloy exhibits ZTE, high compressive strength (424 MPa), ductility (12%), and ultralow density (1.93 g/cm³).

Conclusions:

  • The ZTE behavior is attributed to sustained compressive strain from reversible martensitic transformation of embedded particles.
  • This work establishes a generalizable principle for achieving thermal dimensional stability in metals using recoverable strain.
  • The developed alloy offers exceptional thermal stability for lightweight systems.