Formation and Growth Kinetics of Intermediate Phases in Ni-Al Diffusion Couples

武汉理工大学学报-材料科学版(英文版), 2009, 24(5): 787-790. doi: 10.1007/s11595-009-5787-9

^1, , ^2, , ^3, , ^4, , ^5,

1.National Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116085,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,China

2.School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,China

3.National Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116085,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,China

4.National Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116085,China

5.School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,China

基金项目: the Key Project of Chinese Ministry of Education(106055) the National Natural Science Foundation of China(10477006)

Formation and Growth Kinetics of Intermediate Phases in Ni-Al Diffusion Couples

REN Xiao ^1, , CHEN Guoqing ^2, , ZHOU Wenlong ^3, , WU Chengwei ^4, , ZHANG Junshan ^5,

2.School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,China

4.National Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116085,China

5.School of Materials Science and Engineering,Dalian University of Technology,Dalian 116085,China

Keywords： Ni-Al

Formation and growth of the intermediate phases in the Ni-Al diffusion couples prepared by pouring technique were investigated.Electron probe microanalysis,scanning electron microscopy and X-ray diffraction were used to characterize the product phases in the joints.The results show that two intermediate phases form in the sequence of NiAl_3 and Ni_2Al_3 during solidification. After annealed,Ni_2Al_3 and NiAl_3 still exist in the joints of the couples.The reasons for the formation of Ni_2Al_3 and NiAl_3,as well as the absence of NiAl,Ni_5Al_3 and Ni3Al were discussed,respectively.The growth kinetics of both product phase layers indicates that their growth obeys the parabolic rate law. The activation energies and frequency factors for NiAl_3 and Ni_2Al_3 phases were also calculated ac-cording to the Arrhenius equation.

参考文献

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Formation and Growth Kinetics of Intermediate Phases in Ni-Al Diffusion Couples

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