Superplasticity of a microcrystalline aluminum-lithium alloy under torsion |
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Authors: | V. V. Shpeizman M. M. Myshlyaev M. M. Kamalov M. M. Myshlyaeva |
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Affiliation: | (1) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(2) Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991, Russia;(3) Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia |
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Abstract: | The deformation of an aluminum-lithium alloy under torsion in the temperature range 523–673 K at angular velocities of 0.322 and 0.0322 rad/s is studied. The shear strain γ prior to failure is found to increase with decreasing strain rate, and its temperature dependence has a maximum at 553 K (γ≈30). The initial loading-induced jump in the dependence of the torque on the angle of rotation (stress-strain curve) is followed by a softening stage, which changes into a hardening stage or a stage with a constant torque at all temperatures except those near 673 K. The stress distribution over a cross section is analyzed, and the dependence of the shear-strain rate (dot gamma ) on the stress τ and temperature T is found to be (dot gamma sim tau ^n exp ( - {U mathord{left/ {vphantom {U {kT}}} right. kern-nulldelimiterspace} {kT}})). The results are compared with those obtained earlier from tensile tests of this alloy. |
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