Austenite grain growth in 18Ni(350)maraging steel
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lndmes
Calculated sinz 0
Observed sin 2 0
Calculated Intensity
Observed Intensity
100 110 111 200 210 211
0.0629 0.1259 0.1889 0.2513 0.3148 0.3771
0.0629 0.1261 0.1894 0.2508 0.3159 0.3773
10.0 7.4 2.6 1.2 1.7 2.5
10.0 6.0 2.0 1.5 1.3 1.2
Table II. Calculated and Observed sin20 Values and Intensities for Rhombobedral Mn2oSbs0 Alloy (a = 3,106A, = 86039 ") Cu K a
Rhombohedral Indmes
Calculated sin 20
Obeerved sm 20
Calculated Intensity
100 110 110 111 111 200 210 210 211 211 211
0.0620 0.1173 0.1307 0.1658 0.1927 0.2480 0.2965 0.3235 0.3383 0.3787 0.3922
0.0622 0.1173 0.1308 0.1661 0.1926 0.2481 0.2962 0.3237 0.3373 0.3790 0.3926
100.0 20.3 34.5 7.9 9.3 12 3 9.1 7.9 7.3 6.1 5.7
Observed Intensity 100" 21" 18 7.4 7.7 8.1" 6.1" 6.3 5.1 5.7* 5.2
*Partial overlap w]th antimony lines.
Sb and Mn-Sb a l l o y s . T h e o c c u r r e n c e of the s i m p l e cubic phase (a = 3.03A) r e p o r t e d by G l e s s e n et al, m r a p i d l y quenched N i - S b alloys (95 to 90 wt pet Sb) is c o n f i r m e d by the p r e s e n t work. The e q u i l i b r i u m p h a s e s p r e s e n t in the a s - q u e n c h e d alloys were identified by c o m p a r i n g the o b s e r v e d d i f f r a c t i o n p a t t e r n s with data d e r i v e d from the ASTM file and the o r i g i n a l r e f e r e n c e s d e s c r i b i n g the c r y s t a l s t r u c t u r e s . 7,s In addition to the d i f f r a c t i o n l i n e s c o r r e s p o n d i n g to CrSb2 and e l e m e n t a l a - S b , the diffraction p a t t e r n s of C r - S b quenched a l l o y s c o n t a i n i n g 88 to 94 pet Sb exhibited e x t r a l i n e s which could be i n t e r p r e t e d as a r i s i n g f r o m a s i m p l e cubic cell with a = 3.074A. 2 C o l u m n s 2 and 4 in T a b l e I give the o b s e r v e d s i n 0 v a l u e s and i n t e n s i t i e s d e r i v e d f r o m a s t e p - s c a n n e d C r - S b (90 pct) alloy. T h e sin20 and i n t e n s i t y v a l u e s c u r r e s p o n d i n g to a s i m p l e cubic cell ( a - P o - A h s t r u c t u r e ) ~ space group Prn3rn with 1 atom per unit c e l l in 1 (a): (0, 0, 0) with a = 3.07A a r e also given in T a b l e I. The a g r e e m e n t between the o b s e r v e d and c a l c u l a t e d i n t e n s i t i e s is s a t i s f a c t o r y . It should be pointed out that liquid quenched alloys have b e e n found ~ to exhibit s t r o n g s o l i d i f i c a t i o n t e x t u r e s and these m a y c a u s e the (100) r e f l e c t i o n to be s t r o n g e r than expected. The diffraction p a t t e r n s of r a p i d l y quenched M n - S b alloys containing 95 and 93 wt pct Sb had l i n e s c o r r e s p o n d i n g to ot-Sb and MnSb only. The d - s p a c i n g s of the a n t i m o n y l i n e s in these alloys indicated that some s m a l l s o l u b i l i t y of m a n g a n e s e in a n t i m o n y had o c c u r r e d . F o r r a p i d l y quenched alloys containing 90.3 to 88 wt pct Sb, e x t r a l i n e s of a new m e t a s t a b l e phase w e r e found in addition to the l i n e s c o
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