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* Values are averages of equal numbers of air-quenched and furnace-cooled 
specimens. 
CREEP. Creep properties are given 
in Table 4 (10). Typical behavior in 
the rolled product as a function of 
specimen orientation (8) is indicated at 
left (conditions: 27,000 psi, 343° C). 
Creep strength of annealed Zircaloy-2 
decreased rapidly with increasing tem- 
perature in the range 150°—500° C, the 
maximum temperature investigated. In 
Table 5, the  stress—rupture-strength 
properties are summarized (11). 
TABLE 4—Creep Properties (10) 
Plastic Rupture Reduc- 
Test strain on ————————_ ltton 
temp. Stress loading  e0* e «* Time in area 
(°C) (10% pst) (%) (%) (in./in./hr)  (%) (hr) (%) 
As received 
250 59.0 0.27 1.02 83X10 7.64 38.2 45.7 
250 56.0 0.23 1.23 7.1X10°§ 7.56 468 43.9 
250 53.0 0.25 0.80 1.2 xX 10° § 
250 50.0 0.08 0.375 5.0 XK 107 § 
350 51.3 0.50 0.95 2.3% 107? 14.1 2 53.6 
350 45.0 0.26 0.76 3.5107 14.0 14.5 58.9 
350 41.0 0.05 0.52 5.0X 10> 19.2 1,087 57.0 
350 37.5 0.02 0.40 1.6 X 10-5 15.4+ 3,525+§ 
350 35.0 0.02 0.79 6.2 X 10-¢ § 
350 32.0 0.01 0.268 2.2 xX 10-° § 
Base anneal 20 hr at 750° C in vacuum 
250 32.0 4.67 5 X 107? 26.6 2.5 71.6 
250 30.0 2.35 11 2X 10-*f § 
250 28.0 1.53 4.0 2X 10-*f § 
250 26.0 1.859 2.55 1 xX 107 q 
350 27.0 5.0 13.0 4.9 X 10-4 
12.4 6.2104 21.55 88 66 
350 25.0 3.389 6.7 2.3 XK 1075 
§ 
350 23.0 2.09 t q 
Beta quenched + 10% cold work 
250 bypass) 0.25 0.65 1.6 X 10-4 4.9 69 54 
250 56.0 0.10 0.25 3.5 xX 10-8 Tt 
350 51.0 0.06 0.71 1.9X 10-4 7.86 287 52 
Base anneal + 10% cold work 
250 46.0 0.08 0.48 1.15107? 6.18 14 60 
* ¢) = strain intercept, « = strain rate, € = strain (elongation). 
+ Test run in spring machine (estimate only). 
¢ Still in first-stage creep. 
§ Test stopped. 
gq In test. 
TABLE 5—Summary of Stress—Rupture-Strength Properties (11) 
Stress to produce rupture in indicated time (10? pst) 
Temp. a 
(°C) lhr 10 hr 100 hr 
Annealed sheet, transverse direction 
150 35.2 32.5 30.0 
230 28.0 26.0 24.0 
345 22.2 22.0 21.8 est. 
425 21.3 19.0 16.8 
500 Vat 15.1 11.4 
Cold-worked sheet, transverse direction 
150 73.0 70.5 68.0 
230 63.0 60.5 58.0 
345 50.0 46.0 43.0 
425 38.0 34.0 29.0 
500 27.5 21.5 14.5 
