TY - JOUR
T1 - Effect of low-temperature phase transition o nmechanical behavior of Fe-CU alloys
AU - Minov, Boris
AU - Terentyev, Dmitry
AU - Van Renterghem, Wouter
AU - Osetsky, Yuri
AU - Konstantinovic, Milan
A2 - Bonny, Giovanni
N1 - Score = 10
PY - 2014/3/12
Y1 - 2014/3/12
N2 - Mechanical tests of thermally aged Fe–Cu alloys were performed in the temperature range between 97K and 297K in order to investigate their low-temperature mechanical behavior.Tests performed below 122K have shown that the material breaks in a random fashion already in the elastic region, while above it a clearly pronounced yield pointis observed. This sudden change of the mechanical behavior has been rationalized on the basis of atomistic simulations, addressing the interaction of dislocations with Cu precipitates. The latter study has revealed the presence of bcc to fcc transition induced by dislocations which is a temperature dependent process. It is suppressed with increasing temperature and enhanced with increasing a precipitate size. This transition, efficient at low temperature, leads to the transformation of Cu precipitates into non-coherent particles, which act as stronger obstacles and cause the experimentally observed premature failure. The presence of small non-coherent Cu-precipitates, expected to form according to atomistic predictions, and not observed prior to deformation, was confirmed by means of transmission electron microscopy.
AB - Mechanical tests of thermally aged Fe–Cu alloys were performed in the temperature range between 97K and 297K in order to investigate their low-temperature mechanical behavior.Tests performed below 122K have shown that the material breaks in a random fashion already in the elastic region, while above it a clearly pronounced yield pointis observed. This sudden change of the mechanical behavior has been rationalized on the basis of atomistic simulations, addressing the interaction of dislocations with Cu precipitates. The latter study has revealed the presence of bcc to fcc transition induced by dislocations which is a temperature dependent process. It is suppressed with increasing temperature and enhanced with increasing a precipitate size. This transition, efficient at low temperature, leads to the transformation of Cu precipitates into non-coherent particles, which act as stronger obstacles and cause the experimentally observed premature failure. The presence of small non-coherent Cu-precipitates, expected to form according to atomistic predictions, and not observed prior to deformation, was confirmed by means of transmission electron microscopy.
KW - Cu-precipitates
KW - Dislocations
KW - Transformation
KW - Mechanical properties
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_136487
UR - http://knowledgecentre.sckcen.be/so2/bibref/11731
U2 - 10.1016/j.msea.2013.12.071
DO - 10.1016/j.msea.2013.12.071
M3 - Article
SN - 0921-5093
VL - 597
SP - 46
EP - 51
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
ER -