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Al-20Sm金属间化合物微观组织和力学性能研究
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1.有研科技集团有限公司 高品质有色金属绿色特种冶金国家工程研究中心;2.中国科学院高能物理研究所-散裂中子源科学中心

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Microstructure and Mechanical Properties of Al-20Sm Intermetallic Compounds
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1.National Engineering Research Center for Environment-friendly Metallurgy in Producing Premium Non-ferrous Metals;2.Institute of High Energy Physics, Chinese Academy of Science - Spallation Neutron Source Science Center.

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    摘要:

    Al-Sm合金作为一种新型中子吸收材料,具有低成本、高塑性和高中子吸收率等优点,加工成箔材后可用于中子准直器、费米斩波器等中子关键器件。通过蒙特卡洛模拟(MCNP)对Al-Sm合金的中子透射率进行模拟计算,结果表明,当Sm含量增加到20 wt.%以上时,材料在1~6 mm范围内的中子透射率均低于20%,Al-20Sm合金满足中子吸收率的同时具有一定的塑性。通过真空感应熔炼制备Al-20Sm合金,并采用XRD、EDS和SEM对该合金的微观结构和热处理前后的相转变展开研究。结果表明,铸态组织为α-Al和β-Al4Sm,经过550 ℃、2 h热处理后,发生同素异构转变,合金内的β-Al4Sm全部转变为γ-Al4Sm,550 ℃热处理300 h以后,部分γ-Al4Sm发生熔晶转变,形成Al3Sm。采用纳米压痕技术测试Al-Sm中间化合物的微观力学性能,其中β-Al4Sm、γ-Al4Sm和Al3Sm硬度分别为8.97 GPa、8.91 GPa和9.89 GPa。

    Abstract:

    As a new type of neutron absorbing material, Al-Sm alloy has the advantages of low cost, high plasticity and high neutron absorption. After preparing the alloy into a foil, it can be used for neutron devices such as neutron collimator and Fermi chopper. The neutron transmittance of Al-Sm alloy was simulated by Monte Carlo simulation (MCNP), The results showed that when the Sm content increased above 20 wt.%, the neutron transmittance of the material in the range of 1-6 mm are less than 20%, Al-20Sm alloy satisfies the neutron absorption rate and has a certain plasticity. Al-20Sm alloy was prepared by vacuum induction melting, the microstructures and phases of the as-cast and heat-treated alloys were investigated by XRD, EDS and SEM. The results show that the as-cast microstructures are α-Al and β-Al4Sm. After heat treatment at 550 °C for 2 h, allotropic transformation occurs, and all β-Al4Sm in the alloy is transformed into γ-Al4Sm. After heat treatment at 550 °C for 300 h, and part of γ-Al4Sm undergoes crystalline transformation to form Al3Sm. The micromechanical properties of the Al-Sm intermediate compounds were tested by nanoindentation technique, in which the hardness of β-Al4Sm, γ-Al4Sm and Al3Sm were 8.97 GPa, 8.91 GPa and 9.89 GPa.

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贺子龙,吴刚,黄永章,邱杰. Al-20Sm金属间化合物微观组织和力学性能研究[J].稀有金属材料与工程,2023,52(4):1390~1395.[hezilong, wugang, huangyongzhang, qiujie. Microstructure and Mechanical Properties of Al-20Sm Intermetallic Compounds[J]. Rare Metal Materials and Engineering,2023,52(4):1390~1395.]
DOI:10.12442/j. issn.1002-185X.20220230

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历史
  • 收稿日期:2022-03-22
  • 最后修改日期:2022-05-06
  • 录用日期:2022-05-10
  • 在线发布日期: 2023-05-01
  • 出版日期: 2023-04-25