Am. Russell et Je. Ostenson, A low-temperature modification to the Charpy impact test, with an example study of the fracture toughness of Mg-12%Li between 4.2 to 77 K, J TEST EVAL, 27(4), 1999, pp. 301-303
A modification to the Charpy test for measuring impact fracture toughness h
as been developed that permits the specimen to be bathed in flowing liquid
helium while mounted on the testing machine's anvil immediately prior to im
pact. This method permits samples to be tested at any temperature between 4
.2 and 77 K, which extends the Charpy test to temperatures lower than those
achievable by the conventional liquid bath immersion technique. A body-cen
tered cubic Mg-12%Li single-phase alloy was tested by this new method and f
ound to have anomalously high impact fracture toughness in the temperature
range 4.2 to 77 K.