Direct Transformation of Vacancy Voids to Stacking Fault Tetrahedra Export

@article{citeulike:2239432, abstract = {Defect accumulation is the principal factor leading to the swelling and embrittlement of materials during irradiation. It is commonly assumed that, once defect clusters nucleate, their structure remains essentially constant while they grow in size. Here, we describe a new mechanism, discovered during accelerated molecular dynamics simulations of vacancy clusters in fcc metals, that involves the direct transformation of a vacancy void to a stacking fault tetrahedron (SFT) through a series of 3D structures. This mechanism is in contrast with the collapse to a 2D Frank loop which then transforms to an SFT. The kinetics of this mechanism are characterized by an extremely large rate prefactor, tens of orders of magnitude larger than is typical of atomic processes in fcc metals.}, author = {Uberuaga, B. P. and Hoagland, R. G. and Voter, A. F. and Valone, S. M.}, citeulike-article-id = {2239432}, citeulike-linkout-0 = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000099000013135501000001&idtype=cvips&gifs=yes}, citeulike-linkout-1 = {http://link.aps.org/abstract/PRL/v99/e135501}, citeulike-linkout-2 = {http://dx.doi.org/10.1103/PhysRevLett.99.135501}, doi = {10.1103/PhysRevLett.99.135501}, journal = {Physical Review Letters}, number = {13}, posted-at = {2008-01-16 13:54:37}, priority = {2}, publisher = {APS}, title = {Direct Transformation of Vacancy Voids to Stacking Fault Tetrahedra}, url = {http://dx.doi.org/10.1103/PhysRevLett.99.135501}, volume = {99}, year = {2007} }

TY - JOUR ID - citeulike:2239432 L3 - citeulike-article-id:2239432 N2 - Defect accumulation is the principal factor leading to the swelling and embrittlement of materials during irradiation. It is commonly assumed that, once defect clusters nucleate, their structure remains essentially constant while they grow in size. Here, we describe a new mechanism, discovered during accelerated molecular dynamics simulations of vacancy clusters in fcc metals, that involves the direct transformation of a vacancy void to a stacking fault tetrahedron (SFT) through a series of 3D structures. This mechanism is in contrast with the collapse to a 2D Frank loop which then transforms to an SFT. The kinetics of this mechanism are characterized by an extremely large rate prefactor, tens of orders of magnitude larger than is typical of atomic processes in fcc metals. IS - 13 JF - Physical Review Letters TI - Direct Transformation of Vacancy Voids to Stacking Fault Tetrahedra PB - APS VL - 99 AU - Uberuaga, BP AU - Hoagland, RG AU - Voter, AF AU - Valone, SM PY - 2007/// UR - http://dx.doi.org/10.1103/PhysRevLett.99.135501 ER -