论文标题
晶界诱导的马氏体变换：纳米级的成核，尺寸效应，三重连接效应，微结构和兼容性的相位研究
Grain boundary-induced martensitic transformations: A phase-field study of nucleation, size-effect, triple junction-effect, microstructures, and compatibility at the nanoscale
论文作者
论文摘要
Ginzburg-Landau类型的原始热力学一致性基于菌株的多相相 - 场（PF）方法是用于研究纳米级的多晶材料中晶界（GB）诱导的Martensisitic转化（MTS）的原始基于大型菌株一致的方法。在这种通用PF方法中，n个独立的顺序参数用于描述奥氏体（a）<-> martensite（m）变换和n（> 1）马氏体变体，并且考虑了另一个M独立订单参数用于描述多晶样品中的M（> 1）晶粒。 GB能量由于其在MT期间的结构重排而引起的变化被考虑使用GB的可变能量，这是与A <-> M变换有关的顺序参数的函数。绘制了具有对称平面倾斜GB的双晶体中A，前后体和M之间转化温度的丰富情节，用于不同的奥氏体GB宽度。 The strong effects of the parameters, including the austenitic GB width, change in GB energy due to MTs, GB misorientation, applied strains, and sample size on heterogeneous nucleation of the phases and the subsequent complex martensitic microstructures evolution are explored in various bicrystals with symmetric or asymmetric planar or circular tilt GBs during the forward and reverse transformations.还显示了使用具有三个对称平面倾斜GB的三晶体的三重连接（TJ）能量（TJ）能量以及相邻GB的能量和宽度强烈影响成核和微观结构。研究了整个GB的微观结构的兼容性。绘制了GB和TJ区域的弹性和结构应力，这对于理解GB和TJ在材料失败中的作用至关重要。
An original thermodynamically consistent large strains-based multiphase phase-field (PF) approach of Ginzburg-Landau type is developed for studying the grain boundary (GB)-induced martensitic transformations (MTs) in polycrystalline materials at the nanoscale considering the structural stresses within the interfaces. In this general PF approach, N independent order parameters are used for describing the austenite (A)<->martensite (M) transformations and N(>1) martensitic variants, and another M independent order parameters are considered for describing M(>1) grains in the polycrystalline samples. The change in the GB energy due to its structural rearrangement during MTs is considered using variable energy for the GB(s) as a function of the order parameter related to the A<->M transformation. A rich plot for the temperatures of transformations between the A, premartensite, and M in a bicrystal with a symmetric planar tilt GB are plotted for the varying austenitic GB width. The strong effects of the parameters, including the austenitic GB width, change in GB energy due to MTs, GB misorientation, applied strains, and sample size on heterogeneous nucleation of the phases and the subsequent complex martensitic microstructures evolution are explored in various bicrystals with symmetric or asymmetric planar or circular tilt GBs during the forward and reverse transformations. The triple junction (TJ) energy and the energy and width of the adjacent GBs are also shown to strongly influence the nucleation and microstructures using the tricrystals having three symmetric planar tilt GBs. The compatibility of the microstructures across the GBs is studied. The elastic and structural stresses across the GBs and TJ regions are plotted, which is essential for understanding the role of GBs and TJs in materials failure.
