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| Microdefects and electron densities in NiTi shape memory alloys studied by positron annihilation | |
| 作者单位： | College of Physics Science and Technology Guangxi University，College of Physics Science and Technology，Guangxi University，College of Physics Science and Technology，Guangxi University，College of Physics Science and Technology，Guangxi University，College of Physics Science and Technology，Guangxi University，College of Physics Science and Technology，Guangxi University，Institute of Metal Research，Chinese Acad emy of Sciences，Nanning 530004，China，Department of Basic Science，Jiangsu Teachers University of Technology，Changzhou 213001，China，Nanning 530004，China，Nanning 530004，China，Nanning 530004，China，Nanning 530004，China，Nanning 530004，China，Shenyang 110016，China |
| 基金项目： | 广西自然科学基金;国家自然科学基金 |
| 摘 要： | 1Introduction NiTi alloys are the most successful shape memory alloys as a result of their combination of good functional properties and excellent mechanical strength[1,2].The thermal and mechanical shape memory behavior in these alloys is dependent upon … |
| 收稿时间： | 2006-02-16 |
Microdefects and electron densities in NiTi shape memory alloys studied by positron annihilation |
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| Yi-feng HU, Wen DENG, WEN-bo HAO, Li YUE, Le HUANG, Yu-yang HUANG,Liang-yue XIONG. Microdefects and electron densities in NiTi shape memory alloys studied by positron annihilation[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(6): 1259-1262. DOI: 10.1016/S1003-6326(07)60003-X | |
| Authors: | Yi-feng HU Wen DENG WEN-bo HAO Li YUE Le HUANG Yu-yang HUANG Liang-yue XIONG |
| Affiliation: | aCollege of Physics Science and Technology, Guangxi University, Nanning 530004, China bDepartment of Basic Science, Jiangsu Teachers University of Technology, Changzhou 213001, China cInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
| Abstract: | The microdefects and free electron densities in B2, R and B19′ phases of Ni50.78Ti49.22 alloy were studied by positron lifetime measurements. Comparing the lifetime parameters of the Ni50.78Ti49.22 alloy measured at 295 K and 225 K, it is found that the free electron density of the R phase is lower than that of the B2 phase; the open volume of the defects of the R phase is larger, while the concentration of these defects is lower than that of the B2 phase. The Ni50.78Ti49.22 alloy exhibits B19′ phase at 115 K. In comparison with the R phase, the free electron density of the B19′ phase increases, the open volume of the defects of the B19′ phase reduces, and the concentration of these defects increases. The microdefects and the free electron density play an important role during the multi-step transformations (B2→R→B19′ phase transformations) in Ni50.78Ti49.22 alloy with the decrease of temperature. |
| Keywords: | NiTi alloy microdefect electron density martensite transformation |
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