Ferrous Polycrystalline Shape-Memory Alloy Showing Huge Superelasticity
Ferrous Polycrystalline Shape-Memory Alloy Showing Huge Superelasticity
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DOI：
10.1126/science.1183169
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发表时间：
2010-03-19
期刊：
影响因子：
56.9
通讯作者：
Ishida, K.
中科院分区：
文献类型：
--
作者：
Tanaka, Y.;Himuro, Y.;Ishida, K.
形状记忆合金，如镍钛和铜锌铝，由于超弹性，表现出超过几个百分点的大的可逆应变。尤其是Ni-Ti基合金，具有一定的延展性和良好的超弹性应变，是目前唯一可用于实际应用的超弹性材料。在此，我们描述了一种铁多晶、高强度、形状记忆合金，其超弹性应变超过13%，拉伸强度超过1千兆帕斯卡，这几乎是镍钛合金中获得的最大超弹性应变的两倍。此外，这种铁合金具有很大的减振能力，在加载和卸载过程中磁化强度有很大的可逆变化。这种铁基形状记忆合金作为高阻尼材料和传感器材料具有很大的潜力。
Shape-memory alloys, such as Ni-Ti and Cu-Zn-Al, show a large reversible strain of more than several percent due to superelasticity. In particular, the Ni-Ti-based alloy, which exhibits some ductility and excellent superelastic strain, is the only superelastic material available for practical applications at present. We herein describe a ferrous polycrystalline, high-strength, shape-memory alloy exhibiting a superelastic strain of more than 13%, with a tensile strength above 1 gigapascal, which is almost twice the maximum superelastic strain obtained in the Ni-Ti alloys. Furthermore, this ferrous alloy has a very large damping capacity and exhibits a large reversible change in magnetization during loading and unloading. This ferrous shape-memory alloy has great potential as a high-damping and sensor material.