塑性变形条件下硬质合金中重位点阵晶界的特征分布

Grain Boundary Character Distributions of Coincidence Site Lattice Boundaries in WC-Co Composites under Plastic Deformation

摘要:

通过五参数法，测定了一种塑性变形条件下硬质合金结构中的两类重位点阵晶界，即Σ13a晶界和Σ2晶界，的晶界特征分布。通过与未经过塑性变形的试样进行对比，发现两类重位点阵晶界的数量以及相应惯习面的赋存频率，在塑性变形条件下都有所降低。通过对硬质合金试样结构中的晶界面类型进行精确区分，塑性变形条件下晶界特征分布的演进过程得到解释。

关键词:Σ13a晶界、Σ2晶界、硬质合金、电子背散射衍射、五参数法

Abstract:

Grain boundary character distributions (GBCDs) have been measured for both Σ13a and Σ2 coincidence site lattice (CSL) boundaries in WC-Co composites under plastic deformation condition via five parameter analysis (FPA) method. For the two CSL boundaries, compared to the cases in the undeformed sample, both populations and the habit plane occurrence frequencies of the CSL boundaries decreased in the plastic deformed sample. The interpretation about the evolution of GBCDs during plastic deformation is proposed based on the fine-sorted crystallographic plane categories.

Key words:Σ13a grain boundary; Σ2 grain boundary; Tungsten carbide; Electron backscattered diffraction; Five parameter analysis