| 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.] |
| Al-20Sm金属间化合物微观组织和力学性能研究 |
| 投稿时间：2022-03-22 修订日期：2022-05-06 |
| 中文关键词: Al-Sm合金 蒙特卡洛 纳米压痕 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
| 中文摘要: |
| 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。 |
| Microstructure and Mechanical Properties of Al-20Sm Intermetallic Compounds |
| 英文关键词:Al-Sm alloy Monte Carlo Nanoindentation |
| 英文摘要: |
| 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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