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Shapes of nano Al6Mn precipitates in Mn-containing Al-alloys
Acta Materialia ( IF 8.3 ) Pub Date : 2023-03-06 , DOI: 10.1016/j.actamat.2023.118819
Yuchi Wang , Daniel Freiberg , Yang Huo , Wenhui Zhu , Robert Williams , Mei Li , Yunzhi Wang

Al6Mn is an important precipitate phase in many Al-alloys that contain Mn. However, the three-dimensional (3D) shapes of the Al6Mn precipitates are still unclear because drastically different geometries have been shown in TEM images. In order to understand the equilibrium shapes of Al6Mn precipitates as a function of their sizes, we first derive possible lattice site correspondences (LCs) between the Al6Mn and Al-matrix phases from experimentally observed orientation relationships between and crystal structures of the two phases, which are then further discriminated by crystallographic analysis and transformation strain calculations. We then formulate a phase-field model to simulate the growth process, equilibrium shapes, and habit planes of the precipitates in 3D as a function of size under the chosen LC. Precipitate shapes of all variants at various 2D cross-sections are presented, which could be used to make direct comparisons to TEM images to facilitate the confirmation of the derived LC and to develop a better understanding of precipitate shapes in 3D in specific alloys.



中文翻译:

含锰铝合金中纳米Al6Mn析出相的形貌

Al 6 Mn是许多含Mn铝合金中的重要析出相。然而,Al 6 Mn 沉淀物的三维 (3D) 形状仍不清楚,因为在 TEM 图像中显示出截然不同的几何形状。为了理解 Al 6 Mn 析出物的平衡形状与其尺寸的函数关系,我们首先推导出 Al 6之间可能的晶格位置对应 (LC)Mn 和 Al 基体相来自实验观察到的取向关系和两相的晶体结构,然后通过晶体学分析和转变应变计算进一步区分。然后,我们制定了一个相场模型来模拟 3D 中沉淀物的生长过程、平衡形状和惯性平面,作为所选 LC 下尺寸的函数。呈现了各种 2D 横截面上所有变体的析出物形状,可用于与 TEM 图像进行直接比较,以促进对衍生 LC 的确认,并更好地了解特定合金中 3D 析出物的形状。

更新日期:2023-03-06
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