Variation of crystal orientation during epitaxial growth of dendrites by laser deposition

Variation of crystal orientation during epitaxial growth of dendrites by laser deposition
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激光沉积枝晶外延生长过程中晶体取向的变化

DOI:
10.1016/j.jmst.2017.05.002
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发表时间:
2017-05
期刊:
J. Mater. & Sci. Technol.
影响因子:
--
通讯作者:
Hu Zhuang-Qi
Hu Zhuang-Qi
中科院分区:
其他
文献类型:
--
作者:
Wang Guo-Wei;Liang Jing-Jing;zhou Yi-Zhou;Jin Tao;Sun Xiao-Feng;Hu Zhuang-Qi

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采用外延激光金属成形(E-LMF)技术在单晶衬底上制备了镍基高温合金。研究了两种沉积层的微观组织发育。首次发现了当枝晶在沉积过程中发生偏转时,枝晶的取向变化超过20°。此外,在晶粒中不同取向枝晶之间发现了新的晶界,检测到的晶界角为23°。结果表明,激光池内的流动场是造成这一现象的主要原因。
A nickel-based superalloy was deposited onto a single crystal substrate based on epitaxial laser metal forming (E-LMF). The microstructure development in two depositions has been researched. For the first time, the crystal orientation of dendrites varying beyond 20° was found when the dendrites deflected in deposition. In addition, a new grain boundary was found between different orientation dendrites in a grain, and the detected grain boundary angle was 23°. The result shows that flowing field in laser pool is responsible for this phenomenon.
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