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# Eliot Specht <spechted@ornl.gov>
# requesting 10 days, at minimum=4 days
# beamline 33BM, Crystallization and decomposition
# instrument 33BM-C fourc
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# top:/home/www/beamtime-requests/req00510.txt
# UNICAT Member Beam Time Request  #510
# created Fri Dec 05 13:50:32 CST 2003
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beamline:
	33BM

collaboration:
	No

contact:
	spechted@ornl.gov

days:
	10

description:
	(1) Crystallization investigation in amorphous PdNiP alloys. The goal of the proposed research is to understand the early stages of decomposition in these alloys using in-situ X-ray diffraction. The samples in the amorphous condition will be subjected to isothermal heat treatment at 340°C and follow the stages of crystallization and their lattice parameter as a function of time.
(2) Phase Separation and Austenite Decomposition in Super Bainite Steels: Preliminary investigation showed that there is a phase separation in austenite as it cools down from high temperature.  We will repeat the same steps in simple Fe-0.8C alloy so that we can eliminate the effects of alloying elements and see whether phase separation occurs while holding at 300°C.
 (3) Metastable phases in sputtered films. Previous work showed a metastable phase (possible the alpha-Mn structure) in sputtered Fe-Cr-Ni films. We will examine ternary phase diagrams at a series of (ex situ) annealing temperatures to observe the phase equilibration.

equipment_required:
	Spot welder, CCD x-ray camera, and telescopic level. Up to 10 cylinders of He. One experiment (high temperature) will run on the 33BM-C Huber at 24 keV (below Pd K edge), the other (combinatorial analysis) will run on the 33BM-B topography stages at 12 keV; we will need multiple stages for aligning and rastering the sample as before.

experiment:
	Crystallization and decomposition

foreign_nationals:
	Sudarsanam Suresh Babu (he is already cleared as an APS user).

hazards:
	Hot samples. Alloys of Fe and Pd, and Fe-Cr-Ni thin films on Al2O3, are not otherwise hazardous (nontoxic, nonreactive, nonflammable).

instrument:
	33BM-C fourc

instrument_other:
	

minimumdays:
	4

name:
	Eliot Specht

nonmembers:
	

unacceptable_dates:
	Jan. 29 to Feb 22.

z34ID_details:
	


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