Osamu Yanagisawa1, Tetsuo Yano1, Takayuki Sagahara2 and Masanobu Ohmori1
1Faculty of Engineering, Hiroshima University, Higashi Hiroshima
Work-hardening behavior of Al-Al3Ni eutectic composites in stage II was investigated at various temperatures by studying tensile deformation behaviors and the Bauschinger effect.
The work hardening rate of this material in stage II at temperatures from 293 K to 673 K, which was measured by a simple tensile test, decreases with rising temperature. Even at elevated temperatures the contribution of elastic modulus of Al3Ni fibers to the strain hardening rate is predominant. The matrix of this composites shows a linear work hardening at temperatures from 293 K to 673 K, but its contribution to the strain hardening rate of composites is very small.
The mean internal stress and the reversibile stress of this composites, obtained by a cyclic tensile loading-unloading test, are consistent with the elastic stress component of the fibers and the reversibile stress in the matrix, respectively. This result suggests that the Bauschinger effect in the matrix is very small, even if it exists, and the stress causing the Bauschinger effect is predominantly the elastic component of fibers.
Al-Al3Ni eutectic composites, strain hardening, elevated temperatures, Bauschinger effect, internal stress, reversible stress
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