SUSCEPTIBILITY OF ZIRCONIUM AND ZIRCONIUM ALLOYS TO DELAYED FAILURE HYDROGEN EMBRITTLEMENT
The susceptibility of zirconium and certain zirconium alloys to delayed failure (static fatigue), as caused by a combination of absorbed hydrogen and applied stress, was determined. Specimens of unalloyed zirconium, Zircaloy-2, Zr- - 1.25 Al--1 Sn--l Mo, and Zr--2.5 Nb were hydrogenated in a Sieverts apparatus and evaluated in static tests at room temperature. For unnotched and notched specimens of unalloyed zirconium and Zircaloy-2 containing up to 500 ppm hydrogen, no time-dependent, brittle frictures occurred that could be attributed to the delayed failure phenomenon. The high-strength Zr--Al--Sn--Mo alloy with 500 ppm hydrogen, however, exhibited a high degree of susceptibility to delayed failure at room temperature. Data for heat treated Zr--2.5 Nb containing 500 ppm hydrogen indicated that this material is moderately susceptible to delayed failure. The results are explained in terms of dislocation pile-up at hydride platelets and the ability of these matrices to allow crack propagation. (auth)
- Research Organization:
- Illinois Inst. of Tech., Chicago
- NSA Number:
- NSA-18-018406
- OSTI ID:
- 4033698
- Journal Information:
- Trans. Am. Soc. Metals, Journal Name: Trans. Am. Soc. Metals Vol. Vol: 57
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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DELAYED FAILURE HYDROGEN EMBRITTLEMENT OF ZIRCONIUM. Quarterly Report No. 3, March 15, 1962-June 14, 1962
DELAYED FAILURE HYDROGEN EMBRITTLEMENT OF ZIRCONIUM. Quarterly Report No. 2, December 15, 1961 to March 14, 1962