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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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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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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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Thermal Strain01:19

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...
2.9K
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

2.2K
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...
2.2K
Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

1.1K
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
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Heating and Cooling Curves02:44

Heating and Cooling Curves

28.1K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
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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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Temperature dependent structural evolution in liquid Ag50Ga50 alloy.

Y Su1, X D Wang1, Q Yu1

  • 1International Center for New-Structured Materials (ICNSM), Laboratory of New-Structured Materials, State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 30, 2017
PubMed
Summary
This summary is machine-generated.

Liquid silver-gallium alloy shows a reversible structural change around 1050 K. This atomic structural evolution, confirmed by electrical properties, is linked to silver and gallium atom repartitioning in the metallic liquid.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Understanding atomic structural evolution in liquid alloys is crucial for predicting their properties.
  • Liquid Ag50Ga50 alloy is a model system for studying noble-polyvalent metallic liquids.

Purpose of the Study:

  • To investigate the temperature dependence of atomic structural evolution in liquid Ag50Ga50 alloy.
  • To correlate structural changes with alterations in electrical and thermoelectric properties.

Main Methods:

  • In situ high energy X-ray diffraction (XRD) experiments.
  • First-principles molecular dynamics (FPMD) simulations.
  • Measurements of electrical resistivity and absolute thermoelectric power.

Main Results:

  • A reversible structural crossover was observed in liquid Ag50Ga50 alloy around 1050 K.
  • Experimental results were corroborated by changes in electrical resistivity and thermoelectric power around 1100 K.
  • FPMD simulations indicated abnormal temperature-dependent behavior of partial coordination number and atomic diffusivity around 1200 K, linked to Ag-Ga repartitioning.

Conclusions:

  • The observed structural and property changes are attributed to the repartitioning of Ag and Ga atoms in the liquid between 1050-1200 K.
  • This study provides insights into the structural dynamics of metallic liquids.
  • The findings encourage further research on the structural evolution of noble-polyvalent metals and metallic liquids in general.