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Oligocrystalline Shape Memory Alloys

机译：寡晶形状记忆合金

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摘要

Copper-based shape memory alloys (SMAs) exhibit excellent shape memory properties in single crystalline form. However, when they are polycrystalline, their shape memory properties are severely compromised by brittle fracture arising from transformation strain incompatibility at grain boundaries and triple junctions. Oligocrystalline shape memory alloys (oSMAs) are micro-structurally designed SMA structures in which the total surface area exceeds the total grain boundary area, and triple junctions can even be completely absent. Here it is shown how an oligocrystalline structure provides a means of achieving single crystal-like SMA properties without being limited by constraints of single crystal processing. Additionally, the formation of oSMAs typically involves the reduction of the size scale of specimens, and sample size effects begin to emerge. Recent findings on a size effect on the mar-tensitic transformation in oSMAs are compared and a new regime of heat transfer associated with the transformation heat evolution in these alloys is discussed. New results on unassisted two-way shape memory and the effect of loading rate in oSMAs are also reported.
机译：铜基形状记忆合金（SMA）以单晶形式表现出出色的形状记忆特性。然而，当它们是多晶时，由于在晶界和三重结处的转变应变不相容而引起的脆性断裂严重损害了它们的形状记忆性能。寡晶形状记忆合金（oSMAs）是微结构设计的SMA结构，其中总表面积超过了总晶界面积，甚至可能完全不存在三重连接。此处显示了寡晶结构如何提供一种获得单晶状SMA特性而不受单晶工艺限制的方法。此外，oSMA的形成通常涉及减小样品的尺寸规模，并且样品尺寸效应开始显现。比较了关于尺寸对oSMA中马氏体相变的影响的最新发现，并讨论了与这些合金中相变热演化相关的新的传热机制。还报道了关于无辅助双向记忆的新结果以及oSMAs的加载速率的影响。

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  • 来源
    《Advanced Functional Materials》 |2012年第10期|p.2094-2099|共6页
  • 作者

    Stian M. Ueland; Ying Chen; Christopher A. Schuh;

  • 作者单位

    Department of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue, Cambridge, MA 02139, USA;

    Department of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue, Cambridge, MA 02139, USA Department of Materials Science and Engineering, Rensselaer Polytechnic Institute,110 8th Street, Troy, NY 12180, USA;

    Department of Materials Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue, Cambridge, MA 02139, USA;

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