TY - GEN
T1 - Cascade collapse in copper and nickel
AU - Vetrano, John S.
AU - Robertson, Ian M.
AU - Averback, Robert S.
AU - Kirk, Marquis A.
PY - 1992
Y1 - 1992
N2 - In-situ TEM (transmission electron microscope) studies of the development of the damage structure produced by heavy ion irradiations have been performed in copper and nickel to investigate the possibility that melting occurs in local regions within displacement cascades. These experiments reveal that, as the ion dose increases, additional loops form from isolated displacement cascades, and, more surprisingly, that some of the preexisting loops are annihilated, change position, size, and/or Burger's vector. It was also found that the probability for loop formation and the defect image size are greater in copper than in nickel even at temperatures well below Stage III. It will be demonstrated that these observations provide supporting evidence, albeit indirect, that local melting occurs within the cascade core. These results will be compared to the molecular dynamic computer simulations of the damage created by low-energy self-ions in copper and nickel.
AB - In-situ TEM (transmission electron microscope) studies of the development of the damage structure produced by heavy ion irradiations have been performed in copper and nickel to investigate the possibility that melting occurs in local regions within displacement cascades. These experiments reveal that, as the ion dose increases, additional loops form from isolated displacement cascades, and, more surprisingly, that some of the preexisting loops are annihilated, change position, size, and/or Burger's vector. It was also found that the probability for loop formation and the defect image size are greater in copper than in nickel even at temperatures well below Stage III. It will be demonstrated that these observations provide supporting evidence, albeit indirect, that local melting occurs within the cascade core. These results will be compared to the molecular dynamic computer simulations of the damage created by low-energy self-ions in copper and nickel.
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M3 - Conference contribution
AN - SCOPUS:0027065924
SN - 080311477X
T3 - ASTM Special Technical Publication
SP - 375
EP - 384
BT - ASTM Special Technical Publication
PB - Publ by ASTM
T2 - 15th International Symposium on Effects of Radiation on Materials
Y2 - 19 June 1990 through 21 June 1990
ER -