Nanocrystalline Ti54.5Ni45.5 thin film was prepared by magnetron sputtering followed by rapid thermal annealing. The film displayed martensite structure and （001） compound twin substructure, and the transformation t...Nanocrystalline Ti54.5Ni45.5 thin film was prepared by magnetron sputtering followed by rapid thermal annealing. The film displayed martensite structure and （001） compound twin substructure, and the transformation temperatures Ms and As are 313 and 365 K, respectively. The reflectivity for the wavelength from 200 to 800 nm at 298 and 393 K was investigated, and the results showed that the optical reflectivity contrast between martensite and austensite at 780, 650, 514 and 405 nm was 105.64, 170.83, 112.22 and 149.92%, respectively, which were larger than those of other reported optical recording materials.展开更多
The influence of annealing temperature on the shape memory effect （SME） and recovery ratio of cold-rolled dual-phase Ni58Mn25Ga16.9Gdo.1 high-temperature shape memory alloy were investigated. The results showed that...The influence of annealing temperature on the shape memory effect （SME） and recovery ratio of cold-rolled dual-phase Ni58Mn25Ga16.9Gdo.1 high-temperature shape memory alloy were investigated. The results showed that the SME can be improved by appropriate annealing. SME of 6.0% and recovery ratio of 98% were observed in the rolled alloy at 550 ℃ annealing, which were larger than that of the samples annealed at other temperatures. The annealing temperature was in between the recrystallization temperatures of the martensite and 7 phase, which leads to the work-hardening state of 7 phase kept unchanged during annealing process, and therefore, the critical slip stress of y phase increased. Thus, the plastic deformation of ~ phase reduced during the compression process, and the SME increased.展开更多
基金supported by the National Natural Science Foundation of China (Nos.51471061 and 51601126)the Program for New Century Excellent Talents in University of Ministry of Education of China (No.NCET-12-0160)
文摘Nanocrystalline Ti54.5Ni45.5 thin film was prepared by magnetron sputtering followed by rapid thermal annealing. The film displayed martensite structure and （001） compound twin substructure, and the transformation temperatures Ms and As are 313 and 365 K, respectively. The reflectivity for the wavelength from 200 to 800 nm at 298 and 393 K was investigated, and the results showed that the optical reflectivity contrast between martensite and austensite at 780, 650, 514 and 405 nm was 105.64, 170.83, 112.22 and 149.92%, respectively, which were larger than those of other reported optical recording materials.
基金financially supported by the China Postdoctoral Science Foundation Funded Project(No. 2015M571269)supported by the Natural Science Foundation of China(Nos.51271065,51271069 and 51201062)
文摘The influence of annealing temperature on the shape memory effect （SME） and recovery ratio of cold-rolled dual-phase Ni58Mn25Ga16.9Gdo.1 high-temperature shape memory alloy were investigated. The results showed that the SME can be improved by appropriate annealing. SME of 6.0% and recovery ratio of 98% were observed in the rolled alloy at 550 ℃ annealing, which were larger than that of the samples annealed at other temperatures. The annealing temperature was in between the recrystallization temperatures of the martensite and 7 phase, which leads to the work-hardening state of 7 phase kept unchanged during annealing process, and therefore, the critical slip stress of y phase increased. Thus, the plastic deformation of ~ phase reduced during the compression process, and the SME increased.
