论文信息 - Deformation behavior and plastic instabilities of ultrafine-grained titanium

Deformation behavior and plastic instabilities of ultrafine-grained titanium

Ultrafine-grained (UFG) Ti samples have been prepared using equal channel angular pressing followed by cold rolling and annealing. The deformation behavior of these materials, including strain hardening, strain rate dependence of flow stress, deformation/failure mode, and tensile necking instability, have been systematically characterized. The findings are compared with those for conventional coarse-grained Ti and used to explain the limited tensile ductility observed so far for UFG or nanocrystalline metals.

[1] V. Stolyarov,et al. Microstructure and properties of pure Ti processed by ECAP and cold extrusion , 2001 .

[2] V. Stolyarov,et al. Influence of ECAP routes on the microstructure and properties of pure Ti , 2001 .

[3] K. T. Ramesh,et al. Failure mode and dynamic behavior of nanophase iron under compression , 1999 .

[4] S. Nemat-Nasser,et al. Mechanical properties and deformation mechanisms of a commercially pure titanium , 1999 .

[5] D. G. Morris,et al. Ductility of Nanostructured Materials , 1999 .

[6] M. Mayo,et al. Structure and Mechanical Behavior of Bulk Nanocrystalline Materials , 1999 .

[7] K. T. Ramesh,et al. The high-strain-rate response of alpha-titanium: experiments, deformation mechanisms and modeling , 1998 .

[8] R. Valiev,et al. Structural and mechanical properties of nanocrystalleve titanium processed by severe plastic deformation , 1997 .

[9] P. Sanders,et al. The strength of nanocrystalline metals with and without flaws , 1997 .

[10] Yi-long Bai,et al. Adiabatic Shear Localization: Occurrence, Theories and Applications , 1992 .

[11] T. Haubold,et al. Nanocrystalline intermetallic compounds — An approach to ductility? , 1991 .

[12] M. Staker,et al. The relation between adiabatic shear instability strain and material properties , 1981 .

[13] E. W. Hart. Theory of the tensile test , 1967 .