Effects of Co, Cr, Ir, Pt, Re, Rh, and Ru on the lattice parameter and density of alpha iron
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Fig. 3--Electron micrograph showing high density of dislocations near a martensite plate. Photograph was taken at room temperature. the s p e c i m e n s w e r e I m m e r s e d in liquid n i t r o g e n to Induce m a r t e n s i t i c t r a n s f o r m a t i o n . The M s t e m p e r a t u r e i s about - 80"C. 2 M e a s u r e m e n t s of the change in e l e c t r i c a l r e s i s t a n c e with t e m p e r a t u r e r e v e a l e d t h a t the r e v e r s e t r a n s f o r m a t i o n s t a r t s at a t e m p e r a t u r e , A s , of - 300C and that it i s i n c o m p l e t e at r o o m t e m p e r a t u r e . F i g . l(a) and (b) a r e o p t i c a l m i c r o g r a p h s of an i d e n t i c a l a r e a of the s p e c i m e n s u r f a c e t a k e n at liquid n i t r o g e n t e m p e r a t u r e and r o o m t e m p e r a t u r e , r e s p e c t i v e l y . C o m p a r i s o n of the two m i c r o g r a p h s shows t h a t m a n y m a r t e n s i t e p l a t e s t r a n s f o r m e d b a c k to a u s t e n i t e upon r e h e a t i n g the s p e c i m e n to r o o m t e m p e r a t u r e , but o t h e r s a p p e a r e d to b e unchanged. C l e a r l y , the t e m p e r a t u r e a t which the r e v e r s e t r a n s f o r m a t i o n o c c u r s v a r i e s m a r k e d l y f r o m p l a t e to p l a t e . 1 9 9 0 - V O L U M E 4, AUGUST 1973
Effects of Co, Cr, Ir, Pt, Re, Rh, and Ru on the Lattice Parameter and Density of Alpha Iron L. Z W E L L , G. R. SPEICH, AND W. C. L E S L I E T H E e f f e c t s of v a r i o u s s o l u t e s on the l a t t i c e p a r a m e t e r of ~ - F e a r e of p r i m e i m p o r t a n c e in u n d e r s t a n d i n g t h e i r influence on the m e c h a n i c a l and p h y s i c a l p r o p e r L. ZWELL is with the Joint Committee on Powder Diffraction Standards, Swarthmore, Pa. 19081. G. R. SPEICH is with the Research Laboratory, U. S. Steel Corporation, Monroeville, Pa. 15146. W.C. LESLIE is with the Department of Materials and Metallurgical Engineering, University of Michigan, Ann Arbor, Michigan 48104. Manuscript submitted April 5, 1973. METALLURGICAL TRANSACTIONS
ties of binary solid solutions. In conjunction with a r e cent study of the mechanical properties of Fe-base binary solid solutions, 1 we have determined the effects of Co, Cr, Ir, Pt, Re, Rh, and Ru additions on the lattice p a r a m e t e r of ~ - F e . The densities of these Febase solid solutions were also measured daring d e t e r ruination of the elastic constants. = These measured densities served as an independent check on the lattice p a r a m e t e r measurements. The alloys were prepared by two different methods. One group containing 1.5 to 6 at. pct of each solute was vacuum melted as 17 lb ingots with 0.15 pet Ti added as a getter to remove the interstitial impurities (C, O, and N). High-purity Fe and high-purity Co, Cr, It, Pt, Re, Rh, and Ru were the starting materials. The complete analyses of these materials was given earlier. ~ The second group, containing 8 to 10 at. pct of It, Pt, Re, Rh, or R
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