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不同成分铝合金中间层对高体积分铝基复合材料连结强度的影响

Influence of aluminum alloy interlayer with different composition on bonding strength of high volume fraction aluminum matrix composites

  • 摘要: 采用铝合金作为60vol.% SiC/6061Al复合材料连结的中间层,经热等静压连结。研究了不同成分中间层对连结处微观形貌和结合强度的影响。结果表明:分别采用三种中间层进行热等静压均获得了无孔洞、无明显分层和无Al4C3等有害相的复合材料。并且以4047Al为中间层时,中间层厚度最小,最厚仅为70 μm;抗弯强度和抗剪切强度最高分别可达413 MPa和140 MPa。三种中间层的复合材料断裂方式均以基体合金的韧性断裂和SiC颗粒的断裂为主,SiC颗粒与铝合金界面结合的强度较高,使SiC颗粒起到了良好的承载作用。

     

    Abstract: Utilized the aluminum alloy as the interlayer in the 60vol.% SiC/6061Al composite material, which was bonded through the process of hot isostatic pressure. The study investigated the impact of interlayers with varying compositions on the microstructure and bonding strength of the joints. The results show that using the three kinds of interlayers can obtain composites without holes, obvious stratification, and harmful phases such as Al4C3. When the middle layer was 4047Al, the thickness of the middle layer was the smallest, and the thickness was only 70 μm. The maximum flexural strength and shear strength can reach 413 MPa and 140 MPa, respectively. The main fracture modes of the three interlayer composites were the ductile fracture of the matrix alloy and the fracture of the SiC particles. The bonding strength of the SiC particles with the aluminum alloy interface was high, which makes the SiC particles play a good bearing role.

     

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