The effect of thermal cycling to 1100/sup 0/C on the alpha (Mo) phase in directionally solidified gamma/gamma prime-alpha alloys
Technical Report
·
OSTI ID:5884809
In gamma/gamma prime - alpha eutectic alloys (Ni-Mo-Al), the resistance of the alpha phase to morphological changes during thermal cycling was found to be dependent on the structure formed during directional solidification. Fine, smooth alpha fibers survived up to 1000 five minute cycles to 1100 C with minor microstructural contour changes, while coarser and irregularly shaped alpha fibers tended to spheroidize. A mechanism to explain this phenomenon is proposed. It is suggested that on heating to 1100 C, the alpha phase is likely to undergo morphological changes, until differential thermal expansion creates a stress free interface between the alpha phase and the gamma/gamma prime matrix.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- OSTI ID:
- 5884809
- Report Number(s):
- NASA-TM-81688
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of shape variations on the structure and crystallography of directionally solidified {gamma}/{gamma}{prime}-{alpha} eutectic composites
Analysis of steady-state creep and creep fracture of directionally solidified eutectic {gamma}/{gamma}{prime}-{alpha} alloy
Influences of directionally solidified techniques and hafnium content on a nickel base high temperature alloy
Journal Article
·
Tue Aug 01 00:00:00 EDT 1995
· Scripta Metallurgica et Materialia
·
OSTI ID:103591
Analysis of steady-state creep and creep fracture of directionally solidified eutectic {gamma}/{gamma}{prime}-{alpha} alloy
Journal Article
·
Tue Aug 01 00:00:00 EDT 1995
· Metallurgical Transactions, A
·
OSTI ID:109785
Influences of directionally solidified techniques and hafnium content on a nickel base high temperature alloy
Technical Report
·
Wed Feb 29 23:00:00 EST 1984
·
OSTI ID:6177074