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Low-hysteresis shape-memory ceramics designed by multimode modelling.

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  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.

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This summary is machine-generated.

Researchers engineered zirconia ceramics for high-temperature shape-memory applications. They achieved record-low hysteresis, making these advanced ceramics viable for demanding uses.

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Area of Science:

  • Materials Science
  • Ceramics Engineering
  • Phase Transformations

Background:

  • Zirconia ceramics possess a martensitic phase transformation enabling large strains for high-temperature shape-memory and superelastic applications.
  • Alloying can reduce hysteresis in martensitic materials, but zirconia presents challenges due to volume changes and kinetic barriers.

Purpose of the Study:

  • To develop a method for augmenting lattice engineering in zirconia martensite design.
  • To address physical constraints like volume change and transformation temperature management.
  • To utilize computational thermodynamics and data science for designing novel multicomponent zirconia compositions.

Main Methods:

  • Augmented lattice engineering approach for martensite design.
  • Application of computational thermodynamics and data science tools.
  • Exploration of complex, data-scarce multicomponent spaces.

Main Results:

  • A new zirconia composition with record low hysteresis (15 K) was developed.
  • This hysteresis is approximately ten times lower than typical values and five times lower than previously reported best values.
  • Achieved hysteresis is comparable to widely deployed shape-memory alloys.

Conclusions:

  • The developed method successfully addresses constraints in zirconia lattice engineering.
  • The new zirconia composition demonstrates potential as a high-temperature shape-memory material.
  • This breakthrough paves the way for advanced ceramic applications in extreme environments.