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Hardness of the TiB2/7075 composite increased with increasing deformation temperature In the annealed TiB2/7075 composite, a great amount of fiber-like MgZn2 phases (about I μm in length) and small MgZn2 phases (about 100 nm in size) were precipitated nearby the grain boundaries where the TiB2 particles exist. After deformation at 3000 C, some of the large pre- cipitates and all the small precipitates in these area dissolved into the matrix, meanwhile, fine precipitates were formed in grains. After deformation at 450℃, all the precipitates in the an- nealed composite dissolved into the matrix, and new phases were precipitated in grains. The dissolution of the large fiber-like precipitate makes the saturation level of the matrix increased and leads to an increased solution hardening and natural aging, which contribute much to the hardening effect.
Hardness of the TiB2 / 7075 composite increased with increasing deformation temperature In the annealed TiB2 / 7075 composite, a great amount of fiber-like MgZn2 phases (about I μm in length) and small MgZn2 phases (about 100 nm in size) were precipitated nearby the grain boundaries where the TiB2 particles exist. After deformation at 3000 C, some of the large pre- cipitates and all the small precipitates in these areas dissolved into the matrix, meanwhile, fine precipitates were formed in grains. all the precipitates in the anained composite dissolved into the matrix, and new phases were precipitated in grains. The dissolution of the large fiber-like precipitate makes the saturation level of the matrix increased and leads to an increased solution hardening and natural aging, which contribute much to the hardening effect