挤压及热处理对原位合成(Al_3Zr+ZrB_2)_p/6063Al复合材料力学性能的影响规律

Effects of hot extrusion and heat treatment on mechanical properties of in-situ( Al_3Zr+ZrB_2)_p/6063Al composites

采用Al-KBF4-K2ZrF6剂体系,通过熔体反应法成功制备(Al3Zr+ZrB2)p/6063Al复合材料。对复合材料进行热挤压和热处理,并利用正交试验的方法综合分析挤压和热处理参数(固溶温度、时效时间、时效温度)对铝基复合材料的抗拉强度的影响,采用SEM等分析方法于各阶段分析了复合材料的相组成,探讨了热处理对复合材料拉伸性能的影响的微观机制。结果表明,热挤压和热处理均对复合材料的微观形貌和抗拉强度有较大影响,分别提升了6%和20%。正交试验计算所得热处理参数对抗拉强度影响的大小顺序为固溶温度、时效温度、时效时间。优选出最大抗拉强度热处理工艺为固溶温度723 K,固溶时间4 h;时效温度423 K,时效时间4 h。

Aluminum matrix composites reinforced by in-situ Al3 Zr and ZrB2 particles were successfully fabrica-ted from Al-KBF4-K2 ZrF6 system via direct melt reaction.Extrusion processing and heat treatment were per-formed to find the effect of hot extrusion and heat treatment solution for the highestfigure of the tensile strength to the composite.The morphologies of the in-situ particles and mechanical properties of the composite were investigated by SEM,EDS,XRD,OM and tensile tests.The results show that both extrusion and heat treatment has a positive influence on the microstructure and tensile strength of the composite,which increases 6% and 20% respectively.And the influencing sequence of the heat treatment parameters on the tensile strength was:solution treatment temperature,aging temperature and aging time.The specimen with solution treatment for 4hat 723 K and aging temperature for 4 h at 423 K reaches the highest figure of tensile strength with moder-ate extensibility loss.