Enhanced aging kinetic of Al3BC/6061 Al composites and its micro-mechanism
Enhanced aging kinetic of Al3BC/6061 Al composites and its micro-mechanism
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Al3BC/6061 Al复合材料的强化时效动力学及其微观机制
DOI：
10.1016/j.jallcom.2017.08.053
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发表时间：
2017-12
影响因子：
6.2
通讯作者：
Xiangfa Liu
中科院分区：
文献类型：
--
作者：
Yongfeng Zhao;Xia Ma;Xiaojun Zhao;Houwen Chen;Xiangfa Liu
本文研究了Al 3BC/6061 Al复合材料的时效行为，揭示了Al 3BC对复合材料时效动力学的影响及其微观机理。结果表明，复合材料的时效动力学明显加快，175 °C下的峰值时效时间从14 h下降到6 h。讨论了Al 3BC的加入对复合材料时效动力学的正面和负面影响。高密度位错既可作为异质形核的基底，又可作为加速沉淀过程的扩散通道，而界面上的低空位浓度和溶质偏聚则分别抑制GP区的形成和降低沉淀的化学驱动力。显然，错位所带来的积极影响在当前的工作中贡献更大。显微组织分析表明，针状β″相和板条状Q′相在基体中析出，并受到Al 3BC不同程度的影响。在无Al_3BC颗粒的区域内，它们均匀地分布在基体中。而在Al 3BC颗粒附近，低空位浓度和Mg、Si元素在Al 3BC/Al界面上的偏聚抑制了β″相的析出，而Q′相在位错上的优先形核则促进了Q ′相的析出。
In this work, the aging behavior of Al3BC/6061 Al composites was investigated and the impacts of Al3BC on the aging kinetic as well as its micro-mechanism were unveiled. It is found that the aging kinetic of the composites is considerably accelerated and the peak aging time at 175 °C comes down from 14 to 6 h. Both positive and negative impacts due to the incorporation of Al3BC on the aging kinetic of the composites were discussed. The high density dislocations can either act as the heterogeneous nucleation substrate or play as the diffusion path to expedite precipitation process, while the low vacancy concentration and solute segregation on the interface suppress the formation of GP zone and reduce the chemical driving force for precipitation, respectively. Obviously, the positive effects caused by the dislocation contribute more in the current work. Microstructure characterizations verify that needle-like β″ phase and lath Q′ phase precipitate in the matrix and are impacted by the Al3BC differently. In the area free of Al3BC particle, they distributed uniformly in the matrix. However, in the vicinity of Al3BC particles, the precipitation of β″ is inhibited for the low vacancy concentration and segregation of Mg, Si elements on the Al3BC/Al interface, while the precipitation of Q′ phase is accelerated for the preferred nucleation of Q′ phase on the dislocation.
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影响因子：
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