Determination of entrapped argon in powdered metal alloys
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Determination of Entrapped Argon in Powdered Metal Alloys HARRY E. EATON AND NORMAN S. BORNSTEIN M e t a l l o g r a p h i c o b s e r v a t i o n of powdered m e t a l a l loys consolidated at 2073 K (4 h, 15 kpsi) r e v e a l s that s o m e powder p a r t i c l e s exhibit voids, i . e . , c i r c u l a r c r o s s s e c t i o n s within the p a r t i c l e s h e l l (Fig. 1). The c o n s i s t a n c y in the shape of the voids s u g g e s t s e n t r a p ment of gas by the m e t a l powder p a r t i c l e d u r i n g s o l i d i f i c a t i o n in the m a n u f a c t u r i n g p r o c e s s . Since some c o m m e r c i a l p r o c e s s e s involve the use of an a r g o n r i c h a t m o s p h e r e , 1 a method has b e e n developed to m e a s u r e the e n t r a p p e d a r g o n content of n i c k e l - b a s e d powdered metals. The e x p e r i m e n t a l p r o c e d u r e to d e t e r m i n e the a r g o n content of the n i c k e l b a s e d alloy is v a c u u m fusion in a 60 pct mole b a s i s gold bath at 1473 K (3.0 g alloy with 16.7 g gold). A block d i a g r a m of the v a c u u m fusion a p p a r a t u s is p r e s e n t e d in F i g . 2. The p u r p o s e of the gold is to lower the fusion t e m p e r a t u r e . The evolved
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Fig. 2--TTT-diagram for specimens homogenized for 7 days at 100
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