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Solid State Reaction Mechanism and Microstructure Evolution of Ni-Al Powders during High Energy Ball Milling Revisited by TEM

Published online by Cambridge University Press:  25 June 2015

Guohua Fan*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Lin Geng
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Yicheng Feng
Affiliation:
School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, People’s Republic of China
Xiping Cui
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Xudong Yan
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
*
*Corresponding author. [email protected]
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Abstract

Microstructure evolution during the formation of B2–NiAl by high energy ball milling of equiatomic elemental mixtures was studied by X-ray diffractometer, scanning electron microscopy, and transmission electron microscopy (TEM). The crystallite size, lattice defects and ordering of the B2–NiAl were monitored via TEM as function of milling time. The diffusion reaction, Ni+Al→NiAl3 or/and Ni2Al3, occurred during high energy ball milling, and to a certain extent offered the stored energy for the explosive exothermic reaction, Ni+Al→B2–NiAl. The fine microstructure of newly formed B2–NiAl after 5 h milling involved high density defects, e.g. antiphase boundary, long range ordering domains, vacancies, and dislocations.

Type
Materials Applications and Techniques
Copyright
© Microscopy Society of America 2015 

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