Iron-based superelastic alloys with near-constant critical stress temperature dependence
Iron-based superelastic alloys with near-constant critical stress temperature dependence
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DOI：
10.1126/science.abc1590
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发表时间：
2020-08
期刊：
影响因子：
56.9
通讯作者：
J. Xia;Y. Noguchi;Xiao Xu;Takumi Odaira;Y. Kimura;M. Nagasako;T. Omori;R. Kainuma
中科院分区：
文献类型：
--
作者：
J. Xia;Y. Noguchi;Xiao Xu;Takumi Odaira;Y. Kimura;M. Nagasako;T. Omori;R. Kainuma
温度稳定的超弹性形状记忆合金是超弹性的，这意味着它们可以在大量应变后恢复其原始形状。然而，在大多数合金中，这种行为往往只适用于小范围的温度。Xia等人发现了一种铁-锰-铝-铬-镍合金，其超弹性几乎与温度无关（参见La Roca和Sade的Perspective）。这种独特的特性对于各种温度变化很大的应用都很有吸引力，例如太空探索。《科学》，本期第855页;另见第773页铬控制Fe-Mn-Al-Cr-Ni形状记忆合金中临界应力的温度依赖性。形状记忆合金在变形后恢复其原始形状，使其可用于各种特殊应用。对于金属形状记忆合金，超弹性行为开始于临界应力，该临界应力倾向于随着温度的升高而增加。温度依赖性是通常限制金属形状记忆合金在应用中的使用的常见特征。我们发现了一个铁基超弹性合金系统，其中的临界应力可以优化。我们的Fe-Mn-Al-Cr-Ni合金具有可控的温度依赖性，根据铬含量从正到负变化。这种现象包括温度不变的应力依赖性。这种行为对于一系列基于外层空间的应用和涉及大的温度波动的其他应用是非常理想的。
Temperature-stable superelasticity Shape memory alloys are superelastic, which means that they can recover their original shape after a large amount of strain. However, in most alloys, this behavior tends to only work well for a small range of temperatures. Xia et al. identified an iron-manganese-aluminum-chromium-nickel alloy for which superelasticity is virtually temperature independent (see the Perspective by La Roca and Sade). This distinctive property is attractive for a variety of applications in which large temperature variations are normal, such as in space exploration. Science, this issue p. 855; see also p. 773 Chromium controls the temperature dependence of the critical stress in an Fe-Mn-Al-Cr-Ni shape memory alloy. Shape memory alloys recover their original shape after deformation, making them useful for a variety of specialized applications. Superelastic behavior begins at the critical stress, which tends to increase with increasing temperature for metal shape memory alloys. Temperature dependence is a common feature that often restricts the use of metal shape memory alloys in applications. We discovered an iron-based superelastic alloy system in which the critical stress can be optimized. Our Fe-Mn-Al-Cr-Ni alloys have a controllable temperature dependence that goes from positive to negative, depending on the chromium content. This phenomenon includes a temperature-invariant stress dependence. This behavior is highly desirable for a range of outer space–based and other applications that involve large temperature fluctuations.