标题： Ni-Mn基Heusler合金中自适应马氏体的几何结构 显示英文标题

标题： Geometry of Adaptive Martensite in Ni-Mn-based Heusler alloys

摘要： 调制马氏体在磁性形状记忆合金中起着重要作用，因为所有功能特性都与孪晶微观结构和相界密切相关。 调制马氏体的性质仍然不清楚。 一种方法是自适应马氏体的概念，该概念将所有调制相视为纳米孪晶微观结构。 在本文中，我们以镍-锰基形状记忆合金为例，使用基于马氏体表观理论的解析方程来说明这一概念背后的几何原理。 这可以通过展示用于描述结构的各种单元之间的精确关系来增强对自适应马氏体含义的讨论。 我们使用该概念来讨论习惯平面处的相容性、高阶孪晶边界的本质以及晶格常数对不同调制类型依赖关系。 显示英文摘要

摘要： Modulated martensites play an important role in magnetic shape memory alloys, because all functional properties are closely connected to the twin microstructure and the phase boundary. The nature of the modulated martensites is still unclear. One approach is the concept of adaptive martensite, which regards all modulated phases as nanotwinned microstructures. In this article, we use the Ni-Mn-based shape memory alloys as an example to show the geometric rationale behind this concept using analytic equations based on the phenomenological theory of martensite. This could enhance discussions about the implications of the adaptive martensite by showing the exact relations between the various unit cells used to describe the structure. We use the concept to discuss the compatibility at the habit plane, the nature of high-order twin boundaries and the dependence of the lattice constants on the different types of modulation.