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Abstract
Titanium has a significant potential for the cryogenic industrial fields such as aerospace and liquefied gas storage and transportation due to its excellent low temperature properties. To develop and advance the technologies in cryogenic industries, it is required to fully understand the underlying deformation mechanisms of Ti under the extreme cryogenic environment. Here, we report a study of the lattice behaviour in grain families of Grade 2 CP-Ti during in-situ neutron diffraction test in tension at temperatures of 15–298 K. Combined with the neutron diffraction intensity analysis, EBSD measurements revealed that the twinning activity was more active at lower temperature, and the behaviour was complicated with decreasing temperature. The deviation of linearity in the lattice strains was caused by the load-redistribution between plastically soft and hard grain families, resulting in the three-stage hardening behaviour. The lattice strain behaviour further deviated from linearity with decreasing temperature, leading to the transition of plastically soft-to-hard or hard-to-soft characteristic of particular grain families at cryogenic temperature. The improvement of ductility can be attributed to the increased twinning activity and a significant change of lattice deformation behaviour at cryogenic temperature.
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Details
1 Incheon National University, Department of Mechanical Engineering, Incheon, Republic of Korea (GRID:grid.412977.e) (ISNI:0000 0004 0532 7395)
2 Japan Atomic Energy Agency, J-PARC Center, Tokai, Japan (GRID:grid.20256.33) (ISNI:0000 0001 0372 1485)
3 Metallic Materials Division, Korea Institute of Materials Science, Changwon, Republic of Korea (GRID:grid.410902.e) (ISNI:0000 0004 1770 8726)
4 Changwon National University, School of Materials Science and Engineering, Changwon, Republic of Korea (GRID:grid.411214.3) (ISNI:0000 0001 0442 1951)
5 Incheon National University, Department of Mechanical Engineering, Incheon, Republic of Korea (GRID:grid.412977.e) (ISNI:0000 0004 0532 7395); Incheon National University, Research Institute for Engineering and Technology, Incheon, Republic of Korea (GRID:grid.412977.e) (ISNI:0000 0004 0532 7395)