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本工作研究了镁在镍基高温合金中的分布及存在形式。用STEM,AES,SEN,SIMS等证明了镁偏聚于晶界、晶界M_6C碳化物的相界和MC碳化物相界,并且进入了MC与M_6C碳化物中,从而基本上弄清了镁的分布。镁在界面的偏聚影响了合金的晶界状态:使条状的晶界碳化物块化。通过对晶界能和相界能的测量及理论分析说明镁使晶界碳化物块化的原因是改变了晶界能σΥ-Υ与M_6C碳化物相界能σΥ-c的比值σΥ-Υ/σΥ-c。
This work studied the distribution and existing forms of magnesium in Ni-based superalloy. The results of STEM, AES, SEN and SIMS show that Mg segregates at grain boundaries, grain boundary of M_6C carbides and MC carbide boundaries, and enters into MC and M_6C carbides, so that magnesium Distribution. The segregation of magnesium at the interface affects the grain boundary state of the alloy: the bar-shaped grain boundary carbides are segmented. Through the measurement and theoretical analysis of the grain boundary energy and phase boundary energy, the reason why the carbide makes the carbide in the grain boundaries change is that the ratio of the grain boundary energy σY-γ to the M_6C carbide phase boundary energy σY-c σY-γ / σΥ-c.