No abstract

No abstract

An investigation of the stress-strain response as a function of strain rate, span strength, and dynamic fracture behavior of pure W, U-26Re, U-Ni-Fe and W-Ni-Fe-Co has been performed. Spal 1 strength measurements, obt-ined in symmetric-impact tests, showed an increase in span strength from 0,4 GPa for pure tungsten to 3.9 GPa for 90W-7Ni-3Fe. Concurrent with the increase in span strength was a change in fracture mode from cleavage (for pure W) to a mixture of transgranular and intergranular fracture for the al oye i!! systems. Compression testing perforred at strain rates from 10-s-to 3000 S-l showed that pure tungsten ex! ibits a large strain rate sensitivity and almost no work hardening at tested strain rates. In contrast, W-26Re and W-Ni-Fe-Co displayed significant work hardening at all strain rates.

No abstract

No abstract