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| Fracture Behavior of TiNi Based Shape Memory Alloy Cold-rolled Tube | |
| 引用本文： | LI Yan-wu,LIU Fu-shun* School of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100083,China. Fracture Behavior of TiNi Based Shape Memory Alloy Cold-rolled Tube[J]. 中国航空学报, 2006, 19(Z1) |
| 作者姓名： | LI Yan-wu LIU Fu-shun* School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China |
| 作者单位： | LI Yan-wu，LIU Fu-shun* School of Materials Science and Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100083，China |
| 基金项目： | National Defence Pre-research Foundation |
| 摘 要： | The microstructures and interfacial characteristics of matrices at the inwalls and the out-walls of the cold-rolled tube with different amounts of deformation were investigated by the scanning electronic microscope (SEM), the optical microscope (OM), and the trans-mission electronic microscope (TEM) techniques. It was observed that as the amount of deformation increases, the flaws nucleate at the out-walls of the cold rolled tube, the stress-induced martensites change from (111 ) type Ⅰ twins to (011) type Ⅱ twins and then to (100) compound twins, nanocrystals and bulk amorphisation happen, the high density dislocation causes stress concentration at the out-walls of the Ti50Ni50 cold-rolled tube, and then precipitates its fracture, and the Ti2Ni particles strengthen the grain boundaries and curb the dislocation movements during plastic deformation. The inhomogeneity level of the grains in the Ti50Ni50 alloy plays an important role on the fracture of the Ti50Ni50 cold rolled tube. |
Fracture Behavior of TiNi Based Shape Memory Alloy Cold-rolled Tube |
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| LI Yan-wu,LIU Fu-shun. Fracture Behavior of TiNi Based Shape Memory Alloy Cold-rolled Tube[J]. Chinese Journal of Aeronautics, 2006, 19(Z1) | |
| Authors: | LI Yan-wu LIU Fu-shun |
| Abstract: | The microstructures and interfacial characteristics of matrices at the inwalls and the out-walls of the cold-rolled tube with different amounts of deformation were investigated by the scanning electronic microscope (SEM), the optical microscope (OM), and the transmission electronic microscope (TEM) techniques. It was observed that as the amount of deformation increases, the flaws nucleate at the out-walls of the cold rolled tube, the stress-induced martensites change from (11) type Ⅰ twins to (011) type Ⅱ twins and then to (100) compound twins, nanocrystals and bulk amorphisation happen, the high density dislocation causes stress concentration at the out-walls of the Ti50Ni50 cold-rolled tube, and then precipitates its fracture, and the Ti2Ni particles strengthen the grain boundaries and curb the dislocation movements during plastic deformation. The inhomogeneity level of the grains in the Ti50Ni50 alloy plays an important role on the fracture of the Ti50Ni50 cold rolled tube. |
| Keywords: | shape memory alloy (SMA) cold-rolled tube stress-induced martensite (SIM) amorphisation dislocation |
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