The rolling texture of Pu-3.4 At. Pct Ga
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O N E method for s t a b i l i z i n g the fcc 5 phase of plutonium to room t e m p e r a t u r e i s through alloying with 3.4 at. pct Ga. 1 Below about 2.2 at. pct Ga, a m i x t u r e of the c~ and 5 phases is s t a b l e , so it is i m p o s s i b l e to study the r o l l i n g texture of pure 5 - p h a s e Pu at room t e m p e r a t u r e . Studies on c o p p e r - b a s e alloys 2-4 have shown that i n i t i a t i o n of the t r a n s i t i o n from the c o p p e r type (or p u r e - m e t a l - t y p e ) to the b r a s s - t y p e r o l l i n g texture can occur at solute c o n c e n t r a t i o n s below 1 at. pct. In the case of zinc, as much as a p p r o x i m a t e l y 4 at. pct can be d i s s o l v e d in copper before the texture s t a r t s to change .4 In each of these c o p p e r - b a s e s y s t e m s , the alloy solubility extends out f r o m the pure m e t a l end of the phase d i a g r a m . T h i s then poses an i n t e r e s t i n g q u e s t i o n : does a P u - G a alloy of c o m p o s i tion n e a r the m i n i m u m r e q u i r e d for 5 s t a b i l i t y at room t e m p e r a t u r e behave like a pure m e t a l , from the standpoint of its r o l l i n g t e x t u r e , or like an alloy ? R i c h m a n and Liu 3 concluded that an unequivocal c o r r e lation between the s t a r t of t e x t u r e t r a n s i t i o n s and solute c o n c e n t r a t i o n in c o p p e r - b a s e alloys did not e x i s t among the solute e l e m e n t s i n c l u d e d in t h e i r study. T h u s , it is not possible to p r e d i c t f r o m t h e i r e x p e r i m e n t s how the P u - G a s y s t e m will behave. One p r o b l e m in studying P u - G a a l l o y s of c o m p o s i tions n e a r the lower l i m i t of 5 - p h a s e field, s t a b i l i z e d at room t e m p e r a t u r e , is that they can be t r a n s f o r m e d m e t a s t a b i l y to the (~ phase through the a p p l i c a t i o n of p r e s s u r e , s A P u - 3 . 4 at. pct Ga alloy is far enough into the 5 - s t a b i l i z e d region that it will not t r a n s f o r m to the c~ phase upon r o l l i n g . F o r this r e a s o n , and also b e c a u s e much work has b e e n published on v a r i ous p r o p e r t i e s of this alloy, it was chosen for the c u r rent study. E x t e n s i o n of these e x p e r i m e n t s to a l l o y s c o v e r i n g the e n t i r e delta field (stable at room t e m p e r a t u r e ) is c u r r e n t l y in p r o g r e s s . R. L. MOMENTand J. E. SCHINDLER are Senior Research Metallurgist and Metallurgist,respectively, Dow Chemical Co., Rocky Flats Division,Golden, Colo. Work performed under contract AT(29-1)1106 for the Atomic Energy Commission. Manuscript submitted February 25, 1969. METALLURGICALTRANSACTIONS
T h e r e a r e three m a i n o b j e c t i v e s to this study. F i r s t , we want to d e t e r m i n e the r o l l i n g t e x t u r e of the P u - 3 . 4 at. pct Ga alloy. Second, we wish to v e r i f y whether the r o l l i n g t e x t u r e s of any P u - G a a l l o y s in the 5 - s t
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