Effect of Temperature, Strain Rate, and Grain Size on the Mechanical Response of Ti3SiC2 in Tension

Published

April 1, 2002

Author(s)

M Radovic, M W. Barsoum, T El-Raghy, Sheldon M. Wiederhorn, William E. Luecke

Abstract

Results of tensile tests at constant cross head displacement rates, relaxation tests and cycling loading-unloading tests indicate that the mechanical response of Ti₃SiC₂ is a strong function of temperature, strain rate and grain size. Loading at low temperatures and/or high strain rates results in elastic and anelastic deformation, followed by brittle fracture. Anelastic deformation in this regime can be attributed to the easy glide of dislocation into pileups during loading, and their run back during unloading. At high temperatures ({approximately equal to} 1100 C to 1200 C) and/or low strain rates the mechanical response of Ti₃SiC₂ is plastic. The strain in this regime is elastic, anelastic and plastic. Intense stress relaxation processes are observed, with a sizable fraction (25 %) of the strain being anelastic. At intermediate temperatures and strain rate (transition regime) the mechanical response is controlled by simultaneous damage formation (microcracking) and localized plastic deformation. The results presented here are in good agreement with previous results on the tensile creep of Ti₃SiC₂ and confirm, once again, the close similarities in mechanical response between Ti₃SiC₂ and ice.

Citation

Acta Materialia

Volume

50

Issue

No. 6

Pub Type

Journals

Keywords

brittle, ductile, high temperature, mechanical properties, plastic

Citation

Radovic, M. , Barsoum, M. , El-Raghy, T. , Wiederhorn, S. and Luecke, W. (2002), Effect of Temperature, Strain Rate, and Grain Size on the Mechanical Response of Ti₃SiC₂ in Tension, Acta Materialia (Accessed April 25, 2024)