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A lightweight shape-memory magnesium alloy.

Yukiko Ogawa1, Daisuke Ando2, Yuji Sutou2

  • 1Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11, Aoba-yama, Aoba-ku, Sendai 980-8579, Japan.

Science (New York, N.Y.)
|July 28, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a lightweight magnesium (Mg) shape-memory alloy (SMA) exhibiting superelasticity and shape recovery. This novel Mg SMA offers significant density reduction compared to existing titanium nickel (TiNi) SMAs, paving the way for new industrial applications.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid-state Physics

Background:

  • Shape-memory alloys (SMAs) exhibit shape recovery upon heating and superelasticity.
  • Existing SMAs are typically based on polycrystalline alloys like TiNi, copper, iron, nickel, and cobalt.
  • Lightweight alloys such as magnesium (Mg) and aluminum alloys have not demonstrated these shape-memory properties.

Purpose of the Study:

  • To investigate the potential of lightweight alloys for shape-memory behavior.
  • To develop a novel magnesium-based shape-memory alloy (SMA).

Main Methods:

  • Development of a scandium-containing magnesium alloy.
  • Characterization of the alloy's superelasticity and shape recovery properties.
  • Analysis of the underlying mechanism, identifying reversible martensitic transformation.

Main Results:

  • A novel Mg SMA was successfully developed, incorporating lightweight scandium.
  • The Mg SMA demonstrated superelasticity of 4.4% at -150°C and exhibited shape recovery upon heating.
  • The alloy's density is approximately 2 g/cm³, about one-third less than conventional TiNi SMAs.

Conclusions:

  • The study presents the first Mg SMA with demonstrated superelasticity and shape recovery.
  • The shape-memory properties are attributed to reversible martensitic transformation.
  • This breakthrough opens possibilities for developing and applying lightweight SMAs in various industries.