Minimization of Atomic Displacements as a Guiding Principle of the Martensitic Phase Transformation
Minimization of Atomic Displacements as a Guiding Principle of the Martensitic Phase Transformation
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原子位移最小化作为马氏体相变的指导原则
DOI：
10.1103/physrevlett.125.125502
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发表时间：
2020
影响因子：
8.6
通讯作者：
Stevanović, Vladan
中科院分区：
文献类型：
--
作者：
Therrien, Félix;Stevanović, Vladan
我们对钢的马氏体转变提出了统一的描述，该描述解释了转变的重要实验可观察特征，即诺伊曼带、转变相和未转变相之间的界面（习惯）平面及其取向关系。它是通过对所有原子从奥氏体（fcc 或）相到马氏体（bcc 或）相行进的总距离进行简单的几何最小化而获得的，而不需要任何显式的能量最小化。我们的描述统一了先前提出的机制，但它不依赖于有关剪切面和方向或外部可调参数的假设和实验知识。我们展示了两个相和习惯平面之间的 Kurdjumov-Sach 取向关系（这两者都在实验中被广泛报道）如何从距离最小化中自然地出现。我们还提出了薄膜中不同取向关系（Pitsch）出现的解释。
We present a unifying description for the martensitic transformation of steel that accounts for important experimentally observable features of the transformation, namely, the Neumann bands, the interfacial (habit) plane between the transformed and untransformed phases and their orientation relationship. It is obtained through a simple geometric minimization of the total distance traveled by all the atoms from the austenite (fcc or) phase to the martensite (bcc or) phase, without the need for any explicit energy minimization. Our description unites previously proposed mechanisms but it does not rely on assumptions and experimental knowledge regarding the shear planes and directions, or external adjustable parameters. We show how the Kurdjumov-Sach orientation relationship between the two phases and thehabit plane, which have both been extensively reported in experiments, naturally emerge from the distance minimization. We also propose an explanation for the occurrence of a different orientation relationship (Pitsch) in thin films.