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Microstructure evolution of NiAl–Cr(Mo) planar eutectic lamellar structure during high temperature treatment

Published online by Cambridge University Press:  05 July 2018

Lei Wang ,
Luhan Gao ,
Jun Shen ,
Yunpeng Zhang ,
Tao Wang ,
Zewei Wang ,
Pengfei Qu ,
Jianying Zhang  and
Guojun Zhang
Lei Wang*
Affiliation:
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
Luhan Gao
Affiliation:
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
Jun Shen*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
Yunpeng Zhang*
Affiliation:
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
Tao Wang*
Affiliation:
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
Zewei Wang*
Affiliation:
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
Pengfei Qu
Affiliation:
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
Jianying Zhang*
Affiliation:
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
Guojun Zhang*
Affiliation:
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
c)e-mail: [email protected]
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Abstract

The microstructure evolution of the directionally solidified NiAl–Cr(Mo) planar eutectic lamellar structure was studied at 1150 °C and times of up to 400 h. The planar eutectic lamellar structure is obtained at the withdrawal rate range of 2.5–7.5 μm/s. The interlamellar spacing decreases gradually with increasing the withdrawal rate. The lamellar termination (like angular or smooth) commonly exists in the as-DS alloy. After high temperature treatment, the lamellar structure at 2.5 μm/s (interlamellar spacing, 3.7 μm) is almost stable, only a little migration of termination occurs at 400 h. When the withdrawal rate increases to 4.5 μm/s, the coarsening and migration of termination occur at 200 h. The adjacently coarsened terminations assemble when the coarsening processes to a certain degree, thus resulting in the formation of the blocky Cr(Mo) phase. Similarly, the above instable phenomenon occurs at 7.5 μm/s. The relevant instability mechanisms are discussed.

Keywords

directional solidificationalloymicrostructure
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 22 , 28 November 2018 , pp. 3689 - 3699
Copyright
Copyright © Materials Research Society 2018 

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