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An Overview of Nano Multilayers as Model Systems for Developing Nanoscale Microstructures.

Chelsea D Appleget1, Juan Sebastian Riano2, Andrea M Hodge1,2

  • 1Department of Aerospace and Mechanical Engineering, University of Southern California, Los Angeles, CA 90089, USA.

Materials (Basel, Switzerland)
|January 11, 2022
PubMed
Summary

Nanometallic multilayers (NMMs) transform into equiaxed nanostructured materials. Grain size increases with interface mobility, and microstructure is controlled by initial film properties, enabling tailored nanomaterials.

Keywords:
binary alloyscoherencygrain boundary energyinterfacesmagnetron sputteringnanomaterialsnanometallic multilayers

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Metallurgy

Background:

  • Nanometallic multilayers (NMMs) offer potential for advanced material properties.
  • Understanding their microstructural evolution is crucial for material design.

Purpose of the Study:

  • To investigate the microstructural transformations of binary NMMs into equiaxed nanostructured materials.
  • To identify key factors governing grain growth and microstructure development.

Main Methods:

  • Synthesis of four binary NMM systems (Hf-Ti, Ta-Hf, W-Cr, Mo-Au) using magnetron sputtering.
  • Heat treatment at 1000 °C.
  • Characterization via transmission electron microscopy (TEM).

Main Results:

  • All NMMs retained nanocrystalline grain sizes after transformation to equiaxed structures.
  • Higher interface energy and mobility led to increased grain size.
  • Observed varied segregation behaviors, including grain boundary segregation, precipitation, and intermetallic formation.
  • Microstructure tailoring depends on initial film characteristics like composition, interface energy, and layer structure.

Conclusions:

  • The study provides a global evaluation of NMM systems.
  • NMMs serve as foundational materials for creating tailored nanostructured materials.
  • Material selection and initial film properties are critical for controlling microstructural evolution.