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Coarsening behavior of ����� precipitates in the ��'+�� area of a Ni3Al-based alloy

Journal Article


Abstract


  • The morphological evolution and coarsening kinetics of ����� precipitates in the ��'+�� area of a Ni3Al-based alloy during isothermal aging at temperature range of 800 ��C to 1000 ��C have been investigated. For the aging temperature above 900 ��C, the average size of ����� precipitates increases and the morphology of ����� precipitates gradually changes from cuboidal to strip-like and L-shaped with increasing aging time up to 50 h. The temporal evolution of the average size of ����� precipitates is evaluated by the experimentally measured data and it suggests that the cube rate law fits better for experimental data at the early stage coarsening, while the square rate law fits better for the later stage coarsening. Moreover, using these determined values of coarsening rate constants which determined by using a coarsening rate equation based on the LSEM model, the activation energy of the early stage and later stage coarsening have been calculated as 174.2 kJ/mol and 186.3 kJ/mol, respectively.

Publication Date


  • 2019

Citation


  • Wu, Y., Liu, Y., Li, C., Xia, X., Wu, J., & Li, H. (2019). Coarsening behavior of ����� precipitates in the ��'+�� area of a Ni3Al-based alloy. Journal of Alloys and Compounds, 771, 526-533. doi:10.1016/j.jallcom.2018.08.265

Scopus Eid


  • 2-s2.0-85052847401

Web Of Science Accession Number


Start Page


  • 526

End Page


  • 533

Volume


  • 771

Issue


Place Of Publication


Abstract


  • The morphological evolution and coarsening kinetics of ����� precipitates in the ��'+�� area of a Ni3Al-based alloy during isothermal aging at temperature range of 800 ��C to 1000 ��C have been investigated. For the aging temperature above 900 ��C, the average size of ����� precipitates increases and the morphology of ����� precipitates gradually changes from cuboidal to strip-like and L-shaped with increasing aging time up to 50 h. The temporal evolution of the average size of ����� precipitates is evaluated by the experimentally measured data and it suggests that the cube rate law fits better for experimental data at the early stage coarsening, while the square rate law fits better for the later stage coarsening. Moreover, using these determined values of coarsening rate constants which determined by using a coarsening rate equation based on the LSEM model, the activation energy of the early stage and later stage coarsening have been calculated as 174.2 kJ/mol and 186.3 kJ/mol, respectively.

Publication Date


  • 2019

Citation


  • Wu, Y., Liu, Y., Li, C., Xia, X., Wu, J., & Li, H. (2019). Coarsening behavior of ����� precipitates in the ��'+�� area of a Ni3Al-based alloy. Journal of Alloys and Compounds, 771, 526-533. doi:10.1016/j.jallcom.2018.08.265

Scopus Eid


  • 2-s2.0-85052847401

Web Of Science Accession Number


Start Page


  • 526

End Page


  • 533

Volume


  • 771

Issue


Place Of Publication