2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996 | 1995 | 1994 | 1993 | 1992 | 1991 | 1990 | 1989 | 1988 | 1987 | 1986 | 1985 | 1984 | 1983 | 1982 | 1981 | 1980 | 1979 | 1978 | 1977 | 1976 | 1975 | 1974 | 1973 | 1972 | 1971 | 1970 | 1969 | 1968 | 1967 | 1966 | 1965 | 1964 | 1963 | 1962 | 1961 | 500 | 76 | 0
On the influence of tin on the formation of the sigma phase in the Fe-Cr system
Authors: B.F.O. Costa and S.M. Dubiel
Ref.: Phys. Stat. Sol.(a) 139, 83-94 (1993)
Abstract: The influence of tin on the formation of the sigma-phase, caused by an isothermal annealing at 700-degrees-C, in Fe-Cr alloys with near equiatomic compositions was studied by means of Fe-57 and Sn-119 Mossbauer spectroscopy. It was shown that the addition of up to 5.5 at% Sn to the Fe Cr alloys retards the formation of the sigma-phase significantly. The kinetics of the transformation follows the Johnson-Mehl equation. The evidence was found that tin precipitates on the grain boundaries if its nominal concentration exceeds almost-equal-to 2 at%. For a given nominal concentration of added tin the size of grains was found to be the same in the alpha- and sigma-phases, but it was smaller for samples with higher Sn content. The composition of the sigma-phase remains constant at a value of 46.7 at% Cr and 1.4 at% Sn, regardless of the nominal tin content.
