Determination of fe solubility in. cap alpha. Zr by Mossbauer spectroscopy

Journal Article · Sat Jun 01 04:00:00 EDT 1985 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(85)90036-5· OSTI ID:6345076

Stupel, M M; Bamberger, M; Weiss, B Z

The spectral lines composing the Mossbauer absorption spectrum represent the various phases appearing in a material. The spectral area A /SUB i/ associated with phase i is proportional to the product f /SUB i/ X /SUB i/ C /SUB i/ - where f /SUB i/ , X /SUB i/ and C /SUB i/ denote, respectively, theMossabauer f factor, the weight fraction and the iron content of this phase. The dependence of the spectral area on X /SUB i/ C /SUB i/ permits observation of iron-rich phases present in small amounts. In fact, the Mossbauer technique detects phases at quantities less than 0.5%, well below the sensitivity threshold of X-ray diffraction. It also permits determination of the weight fractions and iron contents as may be obtained by decomposition of the spectrum, especially in cases where conventional methods are inadequate. The solubility of iron in phases in which it is very low can be determined by comparing the spectral area of the phase in question to that of another, iron-rich, phase in equilibrium with it. The method is demonstrated on a Zr-Fe system, with regard to the solubility of iron in the ..cap alpha..Zr(Fe)-phase. The zirconium-iron phase diagram has several alternative proposed forms in the Zr-rich part. A study by the authors identified characteristic spectral lines of two phases in equilibrium: ..cap alpha..Zr(Fe), represented by a single absorption line located at a velocity of -0.007mm/sec (relative to that of ..cap alpha..Fe) - and Zr/sub 2/Fe representedby doublet with isomer shift of -0.320 mm/sec and with quadrupole splitting of 0.910mm/sec. The solubility of iron in ..cap alpha..Zr is very low and known to equal 0.02 w/o at 890/sup 0/C. Metallographic examination confirmed this value and also yielded 0.012 w/o at 700/sup 0/. In the present study the solubility in the 440-670/sup 0/C temperature range was measured.

• Research Organization: Department of Materials Engineering, Technion-Israel Institute of Technology, Haifa
• OSTI ID: 6345076
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 19:6; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ABSORPTION SPECTRA
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
HIGH TEMPERATURE
IRON
IRON ALLOYS
METALLOGRAPHY
METALS
MOESSBAUER EFFECT
PHASE STUDIES
SCATTERING
SOLUBILITY
SPECTRA
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
ZIRCONIUM ALLOYS