Starting from the traveling wave solution, in small amplitude approximation, the Sine–Gordon equation can be re- duced to a generalized Duffing equation to describe the dislocation motion in a superlattice, and the p...Starting from the traveling wave solution, in small amplitude approximation, the Sine–Gordon equation can be re- duced to a generalized Duffing equation to describe the dislocation motion in a superlattice, and the phase plane properties of the system phase plane are described in the absence of an applied field. The stabilities are also discussed in the presence of an applied field. It is pointed out that the separatrix orbit describing the dislocation motion as the kink wave may transfer the energy along the dislocation line, keep its form unchanged, and reveal the soliton wave properties of the dislocation motion. It is stressed that the dislocation motion process is the energy transfer and release process, and the system is stable when its energy is minimum.展开更多
Small amount addition of Ce to FeAl results in a significant increase of room temperaturestrength of the alloy,and the combined addition of Ce and Cr improves both strength andductility.The fracture mode of FeAl conta...Small amount addition of Ce to FeAl results in a significant increase of room temperaturestrength of the alloy,and the combined addition of Ce and Cr improves both strength andductility.The fracture mode of FeAl containing Ce is a mixed one of approximately 70%transgranular cleavage and 30% intergranular failure.In the deformed specimens of binaryFeAl the dislocations observed are mainly single dislocations with =(1/4)a~’〈111〉.However,a number of superlattice dislocations can be observed in the deformed specimens ofthe alloys with Cr addition.展开更多
基金Project supported by the Guangdong Provincial Science and Technology Project, China (Grant No. 2012B010100043)
文摘Starting from the traveling wave solution, in small amplitude approximation, the Sine–Gordon equation can be re- duced to a generalized Duffing equation to describe the dislocation motion in a superlattice, and the phase plane properties of the system phase plane are described in the absence of an applied field. The stabilities are also discussed in the presence of an applied field. It is pointed out that the separatrix orbit describing the dislocation motion as the kink wave may transfer the energy along the dislocation line, keep its form unchanged, and reveal the soliton wave properties of the dislocation motion. It is stressed that the dislocation motion process is the energy transfer and release process, and the system is stable when its energy is minimum.
文摘Small amount addition of Ce to FeAl results in a significant increase of room temperaturestrength of the alloy,and the combined addition of Ce and Cr improves both strength andductility.The fracture mode of FeAl containing Ce is a mixed one of approximately 70%transgranular cleavage and 30% intergranular failure.In the deformed specimens of binaryFeAl the dislocations observed are mainly single dislocations with =(1/4)a~’〈111〉.However,a number of superlattice dislocations can be observed in the deformed specimens ofthe alloys with Cr addition.
