AA6005铝合金的kdb文件示例

参考文件夹: $Pandat_Installation_Folder\Pandat 2024 Examples\PanEvolution\AA6005_yield_strength\AA6xxx.kdb

此kdb文件定义了Al-Mg-Si合金富Al角析出Mg5Si6 (b’) 相的动力学参数。Fcc_A1-(Al)是基体相。该例AA6xxx.kdb可用于大多数的AA6xxx和AA3xx系列合金。同样，一些关键的动力学参数需要根据化学成分做相应修改。注意，该数据库包括了强化模型，可以用于模拟屈服强度 (σ) 以及各项对它的贡献 (σi, σss, σp)。利用 析出强化模型中方程 (10)，可计算硬度。

附录组织演化模块(PanEvolution)中的表格中表 7列出了kdb文件中的强化模型参数。这些模型参数可利用实验数据，通过优化来获得。

<Alloy name="AA6xxx">

<MatrixPhase name="Fcc">

    <ParameterTable type="Strength" name="Parameters for Fcc">

      <Parameter type="Solution_Strengthening_Factor" name="Si"

value="66.3"

        description="solid solution strengthening scaling factor" />

      <Parameter type="Solution_Strengthening_Factor" name="Mg"

value="29"

        description="solid solution strengthening scaling factor" />

      <Parameter type="Solution_Strengthening_Factor" name="Cu"

value="46.4"

        description="solid solution strengthening scaling factor" />

      <Parameter type="Solution_Strengthening_Factor" name="Li"

value="20"

        description="solid solution strengthening scaling factor" />

      <Parameter type="Intrinsic_Strength" value="10" description=

        "intrinsic strength" />

      <Parameter type="Hardness_Factor" value="0.33" description=

        "intrinsic strength" />

      <Parameter type="Hardness_Constant" value="16" description=

        "intrinsic strength" />

    </ParameterTable >

    <ParameterTable type="kinetic" name="Parameters for (Al)">

      <Parameter type="Molar_Volume" value="1.0425E-5" description=

       "Molar Volume" />

    </ParameterTable >

  <PrecipitatePhase name="Mg5Si6" model="KWN" morphology="sphere"

    nucleation="Modified_Homo" growth="SFFK">

    <VariableTable name="Variables replacing built-in variables">

      <Parameter type="Nucleation_Barrier_Energy" value="7.475e-12/dgm(*)^2"

        description="Nucleation_Barrier_Energy" />

    </VariableTable >

    <ParameterTable type="kinetic" name="Parameters for kinetic model">

      <Parameter type="Molar_Volume" value="3.9e-5"

        description="Molar Volume" />

      <Parameter type="Interfacial_Energy" value="0.4"

        description="Interfacial Energy" />

      <Parameter type="Atomic_Spacing" value="4.05E-10"

        description="Atomic Spacing" />

     <Parameter type="Nucleation_Site_Parameter" value="0.3e-5"

        description="Nucleation Site Parameter" />

      <Parameter type="Steady_State_Nucleation_Rate" value="1"

        description="Indicate whether or not steady state nucleation rate" />

      <Parameter type="Driving_Force_Factor" value="1.0"

        description="Driving Force Factor" />

      <Parameter type="Kinetic_Parameter_Factor" value="3.0"

        description="a factor for kinetic parameter" />

      <Parameter type="Effective_Diffusivity_Factor" value="3"

        description="a factor for effective diffusivity" />        

    </ParameterTable >

    <ParameterTable type="strength" name="Parameters for

      strengthening models">

<Parameter type="Strength_Parameter" value="1.1e-5"

        description="th k_ppt in the equation" />

      <Parameter type="Shearing_Critical_Radius" value="5.0e-9"

        description="Critical size of shifting from shearing to looping" />

    </ParameterTable >

  </PrecipitatePhase >

</MatrixPhase >

</Alloy >