Aging Behavior and Property Evolution of In-situ TiB2 Reinforced Aluminum Matrix Composites
The influence of TiB2 particles on aging behavior and mechanism of particles promoting aging precipitation were systematically explored by comparing aging behavior of in-situ TiB2 particle reinforced aluminum matrix compos-ites and matrix alloy.The variation of tensile properties and hardness of TiB2/Al-4.5Cu composites and matrix alloy during the aging process were investigated.The results indicate that TiB2 particles can accelerate the aging process of the composites,while high-density dislocations near TiB2 particles lead to uneven precipitation of Al2Cu phase.Com-pared to the matrix alloy,the peak aging time of TiB2/Al-4.5Cu composite is shortened from 20 h to 8 h.Mechanical property variation of the composites with aging time can be divided into two stages,which is consistent with the trans-formation in Al2Cu precipitates.The yield strength of composites is increased by 24%compared to that of one before aging,and increased by 82%compared to that of aged matrix alloy.
Metal Matrix CompositesAging BehaviorTiB2 ParticlesAl2Cu PrecipitateMechanical Property
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