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A Powder Diffractometry Study of γ'-Phase Formation

Published online by Cambridge University Press:  10 January 2013

S. Ariely ,
G. Kimmel ,
S. F. Dirnfeld ,
M. Bamberger  and
B. Prinz
S. Ariely
Affiliation:
Materials Engineering Dept., Technion–Israel Institute of Technology, Haifa 32000, Israel
G. Kimmel
Affiliation:
Materials Engineering Dept., Technion–Israel Institute of Technology, Haifa 32000, Israel
S. F. Dirnfeld
Affiliation:
Materials Engineering Dept., Technion–Israel Institute of Technology, Haifa 32000, Israel
M. Bamberger
Affiliation:
Materials Engineering Dept., Technion–Israel Institute of Technology, Haifa 32000, Israel
B. Prinz
Affiliation:
Metallgesellschaft A.G., Frankfurt, West Germany
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Abstract

The kinetics of γ'-phase formation in a Ni-base superalloy were studied. The data (pairs of cps and 2θ) were processed by the deconvolution program (Wiedemann, Unnam and Clark, 1987), which was rewritten in FORTRAN and installed on an IBM/VM and a VAX/VMS host computer. Optimal program parameters were found. Pure nickel was used as a standard. The only evidence obtained from the raw data is that the early stage of the aging process is accompanied by broadening. Deconvolution resolved the peaks into three kinds of diffraction lines: Ni(γ), precipitate (γ'), and undefined lines which have been interpreted as satellites. The results show that our X-ray diffraction lines are composed of the main diffraction lines of nickel-base A1 type alloy and additive satellites. In an advanced stage of aging the satellites assume the typical diffraction pattern of γ' phase.

Type
Research Article
Information
Powder Diffraction , Volume 6 , Issue 2 , June 1991 , pp. 66 - 69
Copyright
Copyright © Cambridge University Press 1991

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