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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Recent Developments in Ultrafine Shape Memory Alloys Using Amorphous Precursors.

Sung-Hwan Hong1, Hae-Jin Park1, Gi-An Song2

  • 1Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Republic of Korea.

Materials (Basel, Switzerland)
|December 9, 2023
PubMed
Summary
This summary is machine-generated.

Researchers explored ultrafine shape memory alloys (SMAs) derived from amorphous materials, detailing fabrication methods and factors influencing their unique shape memory and superelastic effects. This work offers a framework for designing novel SMAs.

Keywords:
amorphous precursorcrystallization kineticsshape memory alloyshape memory effectsuperelasticity

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Area of Science:

  • Materials Science
  • Metallurgy

Background:

  • Recent advances in ultrafine shape memory alloys (SMAs) utilize amorphous metallic materials.
  • Unique shape memory effects and superelastic behavior are observed in these advanced alloys.

Purpose of the Study:

  • To systematically review fabrication methods for single-phase ultrafine/nanocrystalline alloys.
  • To define and expand the range of methods for developing multicomponent SMAs from amorphous precursors.
  • To establish a framework for designing novel SMAs with enhanced properties.

Main Methods:

  • Review of fabrication techniques for ultrafine/nanocrystalline alloys.
  • Analysis of crystallization mechanisms in multicomponent amorphous alloys based on composition and thermodynamic parameters.
  • Modulation of crystallization kinetics via annealing conditions in the supercooled liquid state.
  • Investigation of phase stability (austenite and martensite) influenced by alloy composition and grain size.

Main Results:

  • Fabrication methods for single-phase ultrafine/nanocrystalline alloys have been expanded.
  • Crystallization mechanisms in multicomponent amorphous alloys are controllable via composition and annealing.
  • Phase stability and resulting shape memory/superelastic behavior are strongly linked to alloy composition and grain size.
  • A systematic alloy designing method is proposed for developing novel SMAs.

Conclusions:

  • Ultrafine SMAs from amorphous precursors offer unique shape memory and superelastic properties.
  • Controlling crystallization and phase stability through alloy design and processing is key.
  • The proposed methodological framework facilitates the development of advanced SMAs with superior performance.