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# Eliot Specht <spechted@ornl.gov>
# requesting 3 days, at minimum=2 days
# beamline 33ID, "Phase Transformation and Oxidation Experiments on Nickel Base Superalloys"
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# top:/home/www/beamtime-requests/req00313.txt
# UNICAT Member Beam Time Request  #313
# created Fri Dec 06 09:01:33 CST 2002
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beamline:
	33ID

collaboration:
	No

contact:
	spechted@ornl.gov

days:
	3

description:
	The phase transformations and oxidation characteristics of nickel
	base superalloys are important for ongoing research program on 
	nonequilibrium processing of materials and office of industrial
	technology program respectively.  Two sets of experiments will be
	performed.  In the first experiment, the stability of L12 ordered 
	precipitates within a fcc solid solution phase on heating to its
	dissolution temperature will be investigated and also precipitation
	of the gamma' precipitates from the supersaturated gamma phase during
	cooling will be studied.  This experiment will be performed with
	dynamic helium shielding to minimize oxidation. The results
	from these experiments will be compared with computational
	thermodynamic and kinetic calculations. In the second experiment,
	the oxidation kinetics under similar heating and cooling conditions
	will be studied.  The type of oxides that form at different
	temperatures under air will be evaluated.  These measurements will be
	correlated with the phase evolution that was performed under dynamic
	gas shielding.  The results will be crucial to evaluate the complex
	relationship between solid-state transformation and oxidation
	kinetics. Currently, three alloys are being considered for the studies.
	The compositions are given below: 
	
	18500: Ni-8Al-7.7Cr-1.5Mo-1.7Zr-0.008B (wt.%)
	18501: Ni-12Al-4Cr-1.5Mo-0.8Zr-0.008B (wt.%)
	18502: Ni-12.8Al-0.008 (Ni3Al) (wt.%)

equipment+required:
	spot welder
	CCD camera
	Newport diffractrometer

experiment:
	Phase Transformation and Oxidation Experiments on Nickel Base Superalloys

foreign+nationals:
	Sudarsanam Babu (he has begun the use registration process)

hazards:
	Hot samples are a fire and burn hazard.

minimumdays:
	2

name:
	Eliot Specht

nonmembers:
	

unacceptable+dates:
	Feb. 16-March 21
	April 7-11
	If scheduling permits, it would be convenient for me to consolidate
	this with my "stress in protective oxides" request.


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