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Entropy02:39

Entropy

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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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The first law of thermodynamics is quantitatively formulated via an equation relating the internal energy of a system, the heat exchanged by it, and the work done on it. A quantitative formulation of the second law of thermodynamics leads to defining a state function, the entropy.
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Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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Matter: Pure Substances and Mixtures
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Determining Tribocorrosion Rate and Wear-Corrosion Synergy of Bulk and Thin Film Aluminum Alloys
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Nanostructuring with Structural-Compositional Dual Heterogeneities Enhances Strength-Ductility Synergy in Eutectic

S R Reddy1, S Yoshida2, T Bhattacharjee2,3

  • 1Department of Materials Science and Metallurgical Engineering, IIT Hyderabad, Hyderabad, India.

Scientific Reports
|August 10, 2019
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Summary
This summary is machine-generated.

A novel hybrid-rolling process created a unique microstructure in a eutectic high entropy alloy (EHEA). This dual heterogeneous microstructure achieved an exceptional balance of high strength and ductility.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Alloy Design

Background:

  • Eutectic high entropy alloys (EHEAs) offer potential for advanced material properties.
  • Achieving a combination of high strength and ductility in multiphase alloys remains a challenge.
  • Severe plastic deformation is a common method for enhancing alloy properties.

Purpose of the Study:

  • To investigate the effect of a novel hybrid-rolling process on the microstructure and mechanical properties of a lamellar AlCoCrFeNi2.1 EHEA.
  • To explore the potential of creating dual structure-composition heterogeneities for improved mechanical performance.
  • To establish a new microstructural design strategy for multiphase high entropy alloys.

Main Methods:

  • A lamellar L12+B2 AlCoCrFeNi2.1 EHEA was subjected to a two-stage hybrid-rolling process: cryo-rolling followed by warm-rolling at 600°C.
  • A total strain of approximately 2.4 (90% thickness reduction) was applied.
  • Microstructural characterization and mechanical property testing were performed.

Main Results:

  • The hybrid-rolling process resulted in an extremely heterogeneous microstructure with retained lamellar and transformed nanocrystalline regions.
  • These regions exhibited distinct phases with different crystal structures and chemical compositions.
  • The alloy achieved an unprecedented combination of high strength (~2000 MPa) and ductility (~8%).

Conclusions:

  • Dual structure-composition heterogeneities, enabled by the stored energy from cryo-rolling and subsequent warm-rolling, are a viable strategy for enhancing alloy properties.
  • This study demonstrates a novel microstructural design approach for achieving superior strength-ductility combinations in multiphase high entropy alloys.
  • The developed hybrid-rolling process offers a new pathway for advanced EHEA development.