Effect of different solute additions on dendrite morphology and orientation selection in cast binary magnesium alloys

Effect of different solute additions on dendrite morphology and orientation selection in cast binary magnesium alloys
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不同溶质添加量对铸造二元镁合金枝晶形貌和取向选择的影响

DOI:
10.1016/j.actamat.2016.04.014
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发表时间:
2016-06
期刊:
影响因子:
9.4
通讯作者:
Z. Guo
Z. Guo
中科院分区:
材料科学1区
文献类型:
--
作者:
M. Yang;S.-M. Xiong;Z. Guo

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在凝固过程中,如果添加元素的种类或数量发生改变,枝晶形态也会发生相应的变化。为了深入了解这一现象,采用同步x射线断层扫描和电子背散射衍射技术对MgAl、MgBa、MgCa和MgZn合金的三维枝晶形貌进行了表征。结果表明:对于大多数mg基合金,枝晶形貌表现为典型的18枝晶型,并优先沿< 11.2¯0>和< 11.2¯3>方向生长,而对于MgZn合金,随着Zn含量的增加,枝晶形貌会从18枝晶型转变为12枝晶型,即发生枝晶取向转变(DOT)。通过改变基于球面谐波的各向异性函数中相关参数的大小,利用三维相场方法成功地模拟了镁合金枝晶的DOT行为。
In solidification, dendritic morphology was observed to change accordingly if either the type or quantity of the additional element was modified. To gain insight into this phenomenon, the 3D dendrite morphology of different binary magnesium alloys, including MgAl, MgBa, MgCa and MgZn alloys was characterized using synchrotron X-ray tomography and electron backscattered diffraction. Results showed that for most Mg-based alloys, the dendrite exhibited a typical 18-branch morphology with preferred growth orientations along< 11 2¯ 0> and< 11 2¯ 3>, whereas for MgZn alloys, the dendrite morphology would change from the 18-branch pattern to 12-branch if the Zn content increased, ie the so-called dendrite orientation transition (DOT) took place. This DOT behaviour of the Mg alloy dendrite was then successfully modelled using the 3D phase field method by changing the magnitude of related parameters in the specially formulated anisotropy function based on spherical harmonics.
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发表时间: 1972-04
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