固溶处理对Al-13.0Si-4.5Cu-1.0Mg-2.0Ni合金组织和性能的影响  

Effects of Solution Treatment on Microstructure and Properties of Al-13.0Si-4.5Cu-1.0Mg-2.0Ni Alloy

作　　者：郭震[1] 陈文琳[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《铸造》2017年第3期273-276,281,共5页Foundry

摘　　要：通过显微组织观察、XRD物相分析、形貌扫描以及硬度和拉伸性能测试等手段,分析了固溶处理对Al-13.0Si-4.5Cu-1.0Mg-2.0Ni合金微观组织和力学性能的影响。结果表明,合金最佳固溶处理制度为510℃×6 h,时效后,合金室温抗拉强度由187 MPa提高到290 MPa,提高了57.6%。固溶处理后,共晶硅显著球化且弥散分布在α-Al基体中,减轻对合金基体割裂作用;同时,合金中M-Mg_2Si、θ-Al_2Cu和Q-Al_5Cu_2Mg_8Si_6相溶解到α-Al基体形成过饱和固溶体,并在随后时效过程中重新析出,对合金起到固溶强化和沉淀强化作用。Effects of solution treatment on the microstructure and mechanical properties of the Al-13.0Si-4.5Cu-1.0Mg-2.0NiNi alloy were investigated by means of microstructure observation, X-ray diffraction phase analysis a, scanning of topography, and hardness and tensile testing. The results show that the optimal solution treatment of the alloy is solution-treated at 510 ℃ for 6 h. After aging treatment, the strength of the alloy at room temperature increased from 187 MPa to 290 MPa, by 57.6%. Subjected to solution treatment, the eutectic Si crystals are absolutely spheroidized and distributed homogeneously in the α-Al matrix, reducing fragmentation to the matrix. At the same time, the M-Mg_2Si、θ-Al_2Cu和Q-Al_5Cu_2Mg_8Si_6 phases are dissolved into the or-A1 matrix to form supersaturated solid solution, and re-precipitated subsequently during the aging treatment, leading to solution strengthening and precipitation strengthening.

关 键 词：Al-13.0Si-4.5Cu-1.0Mg-2.0Ni合金 固溶处理 微观组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]