The Au-In-Pb system:The AuIn 2 -In-Pb portion
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was noted to be the C u r i e t e m p e r a t u r e 2 of the nickel powder u s e d as the r e f e r e n c e . T h i s e n d o t h e r m would a p p e a r to come f r o m the s a m p l e when a c t u a l l y it was an e x o t h e r m i c r e a c t i o n in the r e f e r e n c e . A total of 59 s a m p l e s was p r e p a r e d f r o m r e a g e n t grade lead and i n d i u m and 99.9 wt pct gold powder to p r o v i d e the d e f i n i t i o n of the s y s t e m . The c o m p o s i t i o n s of the s a m p l e s used a r e shown in F i g . 1. II. RESULTS AND DISCUSSION As in the A u - P b - S n s y s t e m , it b e c a m e a p p a r e n t that the f o r m a t i o n of gold compounds d o m i n a t e d the s y s tem; f u r t h e r , that A u - I n compounds w e r e f a v o r e d over the A u - P b compounds by v i r t u e of m o r e negative free e n e r g i e s . 3 In addition, no t h r e e - e l e m e n t compounds in the r a n g e of i n t e r e s t w e r e s e e n . T h e s e f a c t s suggested the p o s s i b i l i t y of q u a s i b i n a r y s e c t i o n s (using the t e r m i n o l o g y of R h i n e s 4) between P b and AuIn and a l s o between P b and AuIne. D i f f e r e n t i a l t h e r m a l a n a l y s e s indeed c o n f i r m e d that q u a s i b i n a r y s e c t i o n s exist between P b and AuIn and
Au NOt Shown: 52 49.8 Pb 49.8 In 0.4Au 53 49.6 Pb 49.6 In 0.8Au 54 49.4Pb 49.41n 1.2Au
PROCEDURE
The experimental procedure for the phase diagram of this system is essentially the same as described for the Au-Pb-Sn system. I The chief source of information for determining the phase diagram was differential thermal analysis (DTA) with optical metallography, X-ray diffraction and electron microprobe analyses used for verification. As an indication of the sensitivity of the DTA apparatus used, a persistent, reproducible, small endotherm at 359~ on cooling was noticed, an apparent thermodynamic anomaly. That temperature (360~ MAURICE M. KARNOWSKYand FREDERICK G. YOST are members of Technical Staff Sandia Laboratories, Albuquerque, NM 87115. This work was supported by the United States Energy Research and Development Administration. Manuscript submitted October 10, 1975.
METALLURGICAL TRANSACTIONSA
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Fig. 1--The a r r a y of sample compositions for the determination of the AuIn-#t-Pb system.
VOLUME 7A, AUGUST 1976-1149
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Fig. 2--The quasibinary Pb-AuIn system. Fig. 4--Sample 23. 70 wt pct Pb and the equivalent of 30 wt pet Auhl. The phases are identified by X-ray and probe analyses as Pb and AuIn Unetched. t h e s y s t e m s Au-T1, A g - T 1 and Cu-T1. T h i s t e r n a r y s y s t e m contains two of t h e s e v a r i a t i o n s ; in Pb-Auln2, a h o r i z
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