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Characterization of ����� precipitate and ��/����� interface in polycrystalline Ni3Al-based superalloys

Journal Article


Abstract


  • The microstructure, element segregation and ��/����� interface characters of polycrystalline Ni3Al-based superalloys under conventionally solidified (~10 K/s) and rapidly solidified (~103 K/s) conditions were investigated. Cr and Fe are primarily partitioned into the �� phase while Al and Ni are into ����� phase. However, rapid solidification rate of spray casting alloy improves the solubility of Cr and Fe elements at the expense of Al in ����� phase, which decreases the lattice parameters of �� and ����� phases. Moreover, it further increases the absolute value of ��/����� lattice misfit and contributes to the formation of (100) plane misfit dislocations in ��/����� interface. As a result, spray casting specimen possesses higher hardness (6.5 �� 1.0 GPa) and elastic moduli (166.4 �� 15.9 GPa) than that in as-cast alloy with lower solidification rate.

Publication Date


  • 2020

Published In


Citation


  • Li, Y., Li, C., Yu, L., Ma, Z., Li, H., & Liu, Y. (2020). Characterization of ����� precipitate and ��/����� interface in polycrystalline Ni3Al-based superalloys. Vacuum, 176. doi:10.1016/j.vacuum.2020.109310

Scopus Eid


  • 2-s2.0-85081669912

Volume


  • 176

Issue


Place Of Publication


Abstract


  • The microstructure, element segregation and ��/����� interface characters of polycrystalline Ni3Al-based superalloys under conventionally solidified (~10 K/s) and rapidly solidified (~103 K/s) conditions were investigated. Cr and Fe are primarily partitioned into the �� phase while Al and Ni are into ����� phase. However, rapid solidification rate of spray casting alloy improves the solubility of Cr and Fe elements at the expense of Al in ����� phase, which decreases the lattice parameters of �� and ����� phases. Moreover, it further increases the absolute value of ��/����� lattice misfit and contributes to the formation of (100) plane misfit dislocations in ��/����� interface. As a result, spray casting specimen possesses higher hardness (6.5 �� 1.0 GPa) and elastic moduli (166.4 �� 15.9 GPa) than that in as-cast alloy with lower solidification rate.

Publication Date


  • 2020

Published In


Citation


  • Li, Y., Li, C., Yu, L., Ma, Z., Li, H., & Liu, Y. (2020). Characterization of ����� precipitate and ��/����� interface in polycrystalline Ni3Al-based superalloys. Vacuum, 176. doi:10.1016/j.vacuum.2020.109310

Scopus Eid


  • 2-s2.0-85081669912

Volume


  • 176

Issue


Place Of Publication