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Energetics in martensites

机译:马氏体中的能量学

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Martensitic transformations are shape-deforming phase transitions which can be induced in certain alloys as a result of changes in the imposed strains, stresses or temperatures. The interest in these alloys, which undergo a shape-deforming phase transition from a high temperature phase (austenite) to a low temperature phase (martensite), stems in part from their applicability as elements in cative structures. In this paper we focus on the energy transfets that accompany the martensitic phase change. We discuss, in three concrete examples, the ways in which temperature, together with the elastic and dissipated energies, determine the equilibria as well as the quasi-static dynamics in martensites. Thus, in para.1 we consider the pseudoelastic hysteresis in shape-memory wires; our treatment draws from (Leo et al., 1993; Bruno et al., 1995). In para.2, on the other hand, we follow (Bruno et al., 1996) and discuss equilibrium configurations in polycrystaline martensitic polycrystals. In para.3, finally, we present some new theoretical computations for certain typical microstructural lengthscales, the twoin widths, observed in single-crystalline martensite twinning.
机译:马氏体相变是形状变形的相变,由于施加的应变,应力或温度的变化,这种相变可在某些合金中诱发。这些合金经历了从高温相(奥氏体)到低温相(马氏体)的形变相变,对这些合金的兴趣部分源于它们在阳离子结构中的适用性。在本文中,我们集中于伴随马氏体相变的能量转换。我们通过三个具体示例讨论温度,弹性能量和耗散能量共同决定马氏体中的平衡以及准静态动力学的方式。因此,在第1段中,我们考虑了形状记忆导线中的拟弹性滞后现象。我们的治疗方法来自(Leo等,1993; Bruno等,1995)。另一方面,在第2段中,我们遵循(Bruno et al。,1996)并讨论了多晶马氏体多晶中的平衡构型。最后,在第3段中,我们介绍了一些在单晶马氏体孪晶中观察到的典型的微观结构长度尺度(宽度为2英寸)的新理论计算。

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