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
陆仕平 1朱训明 1刘建平 1胡成博 1吴树森2
作者信息
- 1. 浙江万丰摩轮有限公司,新昌 312500
- 2. 华中科技大学材料科学与工程学院,材料成形与模具技术全国重点实验室,武汉 430074
- 折叠
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 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.
关键词
金属基复合材料/时效行为/TiB2颗粒/Al2Cu析出相/力学性能Key words
Metal Matrix Composites/Aging Behavior/TiB2 Particles/Al2Cu Precipitate/Mechanical Property引用本文复制引用
基金项目
浙江省重点研发计划资助项目(2022C01203)
浙江新昌县专精特新重大科技攻关计划资助项目(ZJTX2205)
出版年
2024
NETL
NSTL
万方数据