A lightweight shape-memory magnesium alloy

A lightweight shape-memory magnesium alloy

Shape-memory alloys (SMAs), which display shape recovery upon heating, as well as superelasticity, offer many technological advantages in various applications. Those distinctive behaviors have been observed in many polycrystalline alloy systems such as nickel titantium (TiNi)–, copper-, iron-, nicke...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2016-07, Vol.353 (6297), p.368-370
Hauptverfasser: Ogawa, Yukiko, Ando, Daisuke, Sutou, Yuji, Koike, Junichi
Format: Artikel
Sprache:eng
Schlagworte:
Alloys
Heat
Heating
Intermetallics
Lightweight
Magnesium
Magnesium base alloys
Martensitic transformations
Materials durability
Memory
Shape memory alloys
Titanium base alloys
Weight reduction
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container_end_page 370
container_issue 6297
container_start_page 368
container_title Science (American Association for the Advancement of Science)
container_volume 353
creator Ogawa, Yukiko
Ando, Daisuke
Sutou, Yuji
Koike, Junichi
description Shape-memory alloys (SMAs), which display shape recovery upon heating, as well as superelasticity, offer many technological advantages in various applications. Those distinctive behaviors have been observed in many polycrystalline alloy systems such as nickel titantium (TiNi)–, copper-, iron-, nickel-, cobalt-, and Ti-based alloys but not in lightweight alloys such as magnesium (Mg) and aluminum alloys. Here we present a Mg SMA showing superelasticity of 4.4% at −150°C and shape recovery upon heating. The shape-memory properties are caused by reversible martensitic transformation. This Mg alloy includes lightweight scandium, and its density is about 2 grams per cubic centimeter, which is one-third less than that of practical TiNi SMAs. This finding raises the potential for development and application of lightweight SMAs across a number of industries.
doi_str_mv 10.1126/science.aaf6524
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source Science Online_科学在线; JSTOR
subjects Alloys
Heat
Heating
Intermetallics
Lightweight
Magnesium
Magnesium base alloys
Martensitic transformations
Materials durability
Memory
Shape memory alloys
Titanium base alloys
Weight reduction
title A lightweight shape-memory magnesium alloy
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