Therefore, magnesium deforms plastically by two different mechanisms: slipping and twinning. Magnesium has a hexagonal closed-packed (HCP) lattice structure with a c/a ratio of 1.623, and it does not have enough independent slip systems to sustain large plastic deformation. Therefore, understanding the fatigue behavior of magnesium alloys and magnesium metal matrix composites (MMCs) is an essential aspect especially when they are used as load bearing components. In addition, different body parts are subjected to cyclic loading reaching a magnitude of about 80 MPa and an estimated total of 106 cycles per year. Human body fluids make a corrosive environment to magnesium. Magnesium has a module of elasticity that is close to that of human bones and it is biocompatible with the human body. Magnesium alloys and metal matrix composites (MMCs) are attractive materials for biomedical application.
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