The Effect of Matrix Microstructure on Cyclic Response and Fatigue Behavior of Particle-reinforced 2219 Aluminum Part II
Behavior at 150 °C
The 150 °C cyclic response of peak-aged and overaged 2219/TiC/15p and 2219 Al was examined using fully reversed plastic strain-controlled testing. The cyclic response of peak-aged and overaged particle-reinforced materials showed extensive cyclic softening. This softening began at the commencement of cycling and continued until failure. At a plastic strain below 5 × 103, the unreinforced materials did not show evidence of cyclic softening until approximately 30 pct of the life was consumed. In addition, the degree of cyclic softening (†σ) was significantly lower in the unreinforced microstructures. The cyclic softening in both reinforced and unreinforced materials was attributed to the decomposition of the θ′ strengthening precipitates. The extent of the precipitate decomposition was much greater in the composite materials due to the increased levels of local plastic strain in the matrix caused by constrained deformation near the TiC particles. © 1995 The Minerals, Metals & Material Society.
G. M. Vyletel et al., "The Effect of Matrix Microstructure on Cyclic Response and Fatigue Behavior of Particle-reinforced 2219 Aluminum Part II," Metallurgical and Materials Transactions A, ASM International, Jan 1995.
The definitive version is available at http://dx.doi.org/10.1007/BF02669444
Materials Science and Engineering
Article - Journal
© 1995 ASM International, All rights reserved.