INVESTIGATION OF THE RELATIONSHIP OF TWINNING TO BRITTLE FRACTURE OF REFRACTORY METALS
Technical Report
·
OSTI ID:4695311
Evidence was found for brittle fracture induced by mechanical twinning in single crystals and polycrystalline Mo--C with grain size larger than 0.40 mm. However, there is no evidence for such failures in Mo-C of grain size smaller than 0.25 mm, or in high-purity Nb. The effect of recrystallization texture on twinning is demonstrated, and the orientation dependence of twinning in Nb crystals is reported; a most unusual plastic instability is described in crystals of one orientation. It is shown that twinning in Mo--35Re occurs in bursts, which form in less than 2 sec. The contribution of twinning to the deformation of Mo--35Re decreases with increasing strain. (P.C.H.)
- Research Organization:
- Battelle Memorial Inst., Columbus, Ohio
- NSA Number:
- NSA-17-025772
- OSTI ID:
- 4695311
- Report Number(s):
- ASD-TDR-63-360
- Country of Publication:
- United States
- Language:
- English
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