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Volume 29 Issue 6
Jun.  2022
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文章导航 >  矿物冶金与材料学报（英文）  > 2022  >  29(6): 1206-1215
Siddharth Yadav, S.P. Tewari, J.K. Singh,  and S.C. Ram, Effects of mechanical vibration on the physical, metallurgical and mechanical properties of cast A308 (LM21) aluminum alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1206-1215. https://doi.org/10.1007/s12613-020-2209-7
Cite this article as:
Siddharth Yadav, S.P. Tewari, J.K. Singh,  and S.C. Ram, Effects of mechanical vibration on the physical, metallurgical and mechanical properties of cast A308 (LM21) aluminum alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1206-1215. https://doi.org/10.1007/s12613-020-2209-7
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研究论文

机械振动对铸造A308 (LM21)铝合金物理、冶金和力学性能的影响

  • 1)

    Department of Mechanical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India

  • 2)

    Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi 221005, India

  • 通讯作者:

    Siddharth Yadav    E-mail: siddharthy.rs.mec15@itbhu.ac.in

  • 本文研究了A308压铸合金在机械振动作用下凝固过程中的组织、物理和力学性能。采用功率放大器作为功率输入器件，在31 μm的恒定振幅下，采用不同频率(0、20、30、40、50 Hz)进行功率输入。采用X射线衍射、光学显微镜和扫描电子显微镜观察了固定和振动条件下铸态试样的形态变化。利用ImageJ软件对铸件的金相特征进行了评价。在30 Hz频率下，与固定铸造相比，初晶α-Al晶粒尺寸、枝晶臂间距、共晶硅平均面积、长径比和孔隙率等冶金特征平均值分别降低了34%、59%、56%、22%和62%。力学性能测试表明，在30 Hz频率下，铸件的屈服强度(YS)、抗拉强度(UTS)、伸长率(EL)和显微硬度(HV)分别比固定铸造提高了8%、13%、17%和16%。拉伸试样的断口表现为脆性面、解理面、韧性撕裂和韧窝形貌的混合断裂行为。小韧窝的存在表明在断裂前发生了塑性变形。
    • Research Article

    Effects of mechanical vibration on the physical, metallurgical and mechanical properties of cast A308 (LM21) aluminum alloy

    + Author Affiliations
      Abstract
    • This study investigated the microstructure, physical, and mechanical properties of die-cast A308 alloy subjected to mechanical vibration during solidification. Different frequencies (0, 20, 30, 40, and 50 Hz) at constant amplitude (31 μm) were employed using a power amplifier as the power input device. X-ray diffraction, optical microscopy, and scanning electron microscopy were used to examine the morphological changes in the cast samples under stationary and vibratory conditions. Metallurgical features of the castings were evaluated using ImageJ software. The average values of metallurgical features, including primary α-Al grain size, dendrite arm spacing, average area of eutectic silicon, aspect ratio, and percentage porosity, reduced by 34%, 59%, 56%, 22%, and 62%, respectively, at 30 Hz frequency compared with stationary casting. Mechanical tests of the cast samples showed that the yield strength (YS), ultimate tensile strength (UTS), percentage elongation (%EL), and microhardness (HV) increased by 8%, 13%, 17%, and 16%, respectively, at 30 Hz frequency compared with stationary casting. The fractured surface of the tensile specimens exhibited mixed-mode fracture behavior because of brittle facets, cleavage facets, ductile tearing, and dimple morphologies. The presence of small dimples showed that plastic deformation occurred before fracture.
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