Al-20Sm金属间化合物微观组织和力学性能研究  

Microstructure and Mechanical Properties of Al-20Sm Intermetallic Compounds

作　　者：贺子龙 吴刚 黄永章 邱杰[4,5] He Zilong;Wu Gang;Huang Yongzhang;Qiu Jie(National Engineering Research Center for Environment-Friendly Metallurgy in Producing Premium Non-ferrous Metals,GRINM Group Co.,Ltd,Beijing 100088,China;China GRINM Resources and Environment Tech.Co.,Ltd,Beijing 101407,China;General Research Institute for Nonferrous Metals,Beijing 100088,China;University of Chinese Academy of Science,Beijing 100049,China;Institute of High Energy Physics,Chinese Academy of Science,Beijing 100049,China)

机构地区：[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,北京100088 [2]有研资源环境技术研究院(北京)有限公司,北京101407 [3]北京有色金属研究总院,北京100088 [4]中国科学院大学,北京100049 [5]中国科学院高能物理研究所,北京100049

出　　处：《稀有金属材料与工程》2023年第4期1390-1395,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51674035)。

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%(质量分数,下同)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-Al_(4)Sm,经过550℃/2h热处理后,发生同素异构转变,合金内的β-Al_(4)Sm全部转变为γ-Al_(4)Sm,550℃热处理300h以后,部分γ-Al4Sm发生熔晶转变,形成Al_(3)Sm。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-Al_(4)Sm、γ-Al_(4)Sm和Al_(3)Sm硬度分别为8.97、8.91和9.89 GPa。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 show that when the Sm content increased above 20%,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,and 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 areα-Al andβ-Al_(4)Sm.After heat treatment at 550℃ for 2 h,allotropic transformation occurs,and allβ-Al_(4)Sm in the alloy is transformed intoγ-Al_(4)Sm.After heat treatment at 550℃ for 300 h,part ofγ-Al_(4)Sm undergoes crystalline transformation to form Al_(3)Sm.The micromechanical properties of the Al-Sm intermediate compounds were tested by nanoindentation technique.The hardness ofβ-Al_(4)Sm,γ-Al_(4)Sm and Al_(3)Sm are 8.97,8.91 and 9.89 GPa.

关 键 词：Al-Sm合金 蒙特卡洛 纳米压痕 

分 类 号：TG146.21[一般工业技术—材料科学与工程]