A lightweight shape-memory magnesium alloy
A lightweight shape-memory magnesium alloy
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DOI：
10.1126/science.aaf6524
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发表时间：
2016-07-22
期刊：
影响因子：
56.9
通讯作者：
Koike, Junichi
中科院分区：
文献类型：
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作者：
Ogawa, Yukiko;Ando, Daisuke;Koike, Junichi
形状记忆合金（sma）在加热时具有形状恢复和超弹性，在各种应用中具有许多技术优势。这些独特的行为已经在许多多晶合金体系中被观察到，如镍钛、铜、铁、镍、钴和钛基合金，但在轻合金如镁和铝合金中没有观察到。在这里，我们提出了一种Mg SMA，在-150摄氏度时显示出4.4%的超弹性，加热后形状恢复。形状记忆性能是由可逆马氏体相变引起的。这种镁合金含有轻质钪，其密度约为每立方厘米2克，比实用的TiNi sma少三分之一。这一发现提高了在许多行业中开发和应用轻量级sma的潜力。
Shape-memoryalloys (SMAs), which display shape recovery upon heating, aswell as superelasticity, offermany 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 degrees 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.