Fabrication of High-Strength Al/SiCp Nanocomposite Sheets by Accumulative Roll Bonding
Fabrication of High-Strength Al/SiCp Nanocomposite Sheets by Accumulative Roll Bonding
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DOI：
10.1007/s11661-011-1039-7
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
M. Rezayat;A. Akbarzadeh;A. Owhadi
中科院分区：
文献类型：
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作者：
M. Rezayat;A. Akbarzadeh;A. Owhadi
将累积辊焊（ARB）作为一种强塑性变形方法成功地制备了Al-SiC纳米复合材料片材。研究了工艺道次和SiC含量对复合材料显微组织和力学性能的影响。正如预期的那样，通过ARB工艺产生的超细晶粒组织以及金属基复合材料（MMC）中的纳米级颗粒增强使其具有优异的力学性能。拉伸试验结果表明，复合材料的屈服强度和抗拉强度随着ARB循环次数的增加而增加，最后循环时不饱和。扫描电镜（SEM）结果表明，在ARB循环的最后阶段，颗粒在基体中的分布是随机而均匀的，颗粒基体界面处发生了较强的机械结合。透射电子显微镜（TEM）和相应的选择区域衍射（SAD）显示出结构中具有较大取向偏差的超细晶粒。当颗粒体积分数达到3.5 vol pct时，复合板的屈服强度和抗拉强度分别比累积的滚接铝板提高1.3倍和1.4倍以上。
Accumulative roll bonding (ARB) was successfully used as a severe plastic deformation method to produce Al-SiC nanocomposite sheets. The effects of process pass and amount of SiC content on microstructure and mechanical properties of the composites are investigated. As expected, production of ultrafine grain structures by the ARB process as well as nanosize particulate reinforcements in the metal matrix composite (MMC) resulted in excellent mechanical properties. According to the results of the tensile tests, it is shown that the yield and tensile strengths of the composite sheet increased with the number of ARB cycles without saturation at the last cycles. Scanning electron microscopy (SEM) revealed that the particles had a random and uniform distribution in the matrix by the last ARB cycles, and strong mechanical bonding takes place at the interface of the particle matrix. Transmission electron microscopy (TEM) and the corresponding selected area diffraction (SAD) demonstrate ultrafine grains with large misorientation in the structure. It is also shown that by increasing the volume fraction of particles up to 3.5 vol pct, the yield and tensile strengths of the composite sheets increased more than 1.3 and 1.4 times the accumulative roll-bonded aluminum sheets, respectively.