Microstructure and mechanical behaviors of 6061 Al matrix hybrid composites reinforced with SiC and stainless steel particles
Microstructure and mechanical behaviors of 6061 Al matrix hybrid composites reinforced with SiC and stainless steel particles
复制标题
SiC和不锈钢颗粒增强6061铝基杂化复合材料的显微组织和力学性能
DOI：
10.1016/j.msea.2021.140732
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发表时间：
2021-01-11
期刊：
影响因子：
6.4
通讯作者：
Teng, Jie
中科院分区：
文献类型：
--
作者：
Tang, Sisi;Shao, Songying;Teng, Jie
混杂铝基复合材料由于其综合性能的提高，在航空、航天和汽车工业中具有广泛的应用前景，有望取代单一增强复合材料。为了提高6061铝基复合材料的强度和塑性，采用粉末冶金法制备了SiC和不锈钢颗粒增强的6061铝基复合材料。通过单轴拉伸试验和显微组织分析，研究了不同时效条件下的力学性能、断裂行为和变形机制。结果表明，与单一SiC颗粒增强的复合材料相比，SiC颗粒与不锈钢颗粒混杂增强的复合材料在不损失强度的情况下，能够有效地提高材料的塑性。在各种人工时效处理下，复合材料的力学性能发生了变化，但不锈钢颗粒始终在复合材料中起积极作用，并没有改变铝基体的析出顺序。塑性的改善主要归因于增强颗粒的可变形性质。载荷被成功地传递到不锈钢颗粒，并导致混杂增强复合材料的均匀应变分布。相反，在变形过程中，高界面位错堆积引起的界面断裂限制了单一SiC颗粒增强铝基复合材料的塑性。
Hybrid aluminum matrix composites are appealing in the aviation, aerospace and automotive industries and have the potential to substitute single reinforced composites due to their enhanced comprehensive properties. In the present work, 6061 Al matrix composite hybrids reinforced with SiC and stainless steel particles were prepared to improve the strength and ductility by the powder metallurgy method. The mechanical properties, fracture behaviors and deformation mechanisms under various aging conditions were investigated by uniaxial tensile tests and microstructural characterizations. The results showed that the composite hybrid reinforced with SiC and stainless steel particles could effectively enhance the ductility without losing strength compared to the composite reinforced with single SiC particles. Under various artificial aging treatments, the mechanical properties of the composites changed, but the stainless steel particles always played a positive role in the composites and did not change the precipitation sequence of the aluminum matrix. The improvement in ductility was mainly attributed to the deformable nature of the reinforcement particles. The load was successfully transferred to the stainless steel particles and resulted in a uniform strain distribution of the hybrid reinforced composites. Conversely, the interfacial fracture caused by high interfacial dislocation pileup during deformation limited the plasticity of aluminum matrix composites reinforced with single SiC particles.