Abstract
Herein, the compressive fatigue behaviour of three-dimensional metal matrix composites/steel (3D-MMCs/steel) is studied. The ZrO2-toughened Al2O3 (ZTA) particle strengthens 40Cr steel composite materials (MMCs) as a reinforcement. The experimental conditions were uniaxial compression fatigue under 500 MPa and 20 Hz. The failure modes of the composites were analysed by three-dimensional x-ray microscopy. The fatigue life of the 3D-MMCs/steel composite is 9.0 × 106 cycles, and for the homogeneous ZTAp/40Cr composite material is 1.03 × 106 cycles. The analysis shows that grids of the matrix area can inhibit the propagation of a crack in the MMC area and can cause it to turn or to disappear. Toughening of the 3D-MMCs/steel composite primarily occurs because the matrix area grids protect the MMC area from tearing.In other words, the presence of the MMC grids causes the toughening of this kind of material.
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