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原位TiB2增强铝基复合材料的时效行为及性能演变
Aging Behavior and Property Evolution of In-situ TiB2 Reinforced Aluminum Matrix Composites
【摘要】 通过对比原位TiB2颗粒增强铝基复合材料和基体合金的时效行为,研究了TiB2颗粒对时效行为的影响以及颗粒促进时效沉淀的机制。此外,还研究了时效过程中TiB2/Al-4.5Cu复合材料和基体合金的拉伸性能和硬度的变化。结果表明,TiB2颗粒加速了复合材料的时效过程,同时TiB2颗粒附近的高密度位错导致了Al2Cu相的不均匀析出。相较于基体合金,TiB2/Al-4.5Cu复合材料的峰时效时间由20 h缩短至8 h。复合材料力学性能随时效时间的变化可以分为2个阶段,这与Al2Cu析出相的变化具有良好的一致性。复合材料的屈服强度比时效前提高了24%,比时效的基体合金提高了82%。
【Abstract】 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 composites 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. Compared 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 transformation 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.
【Key words】 Metal Matrix Composites; Aging Behavior; TiB2 Particles; Al2Cu Precipitate; Mechanical Property;
- 【文献出处】 特种铸造及有色合金 ,Special Casting & Nonferrous Alloys , 编辑部邮箱 ,2024年01期
- 【分类号】TB333
- 【下载频次】6