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作 者:宗烨 黄群英[1,2] 翟玉涛 李桃生[1] ZONG Ye;HUANG Qunying;ZHAI Yutao;LI Taosheng(Hefei Institute of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)
机构地区:[1]中国科学院合肥物质科学研究院,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026
出 处:《热加工工艺》2025年第6期21-27,共7页Hot Working Technology
基 金:国家重点研发计划资助项目(2020YFB1901900);安徽省重点研究与开发计划资助项目(2022A05020039)。
摘 要:为了获得一种具有较优力学性能的新型中子屏蔽材料,通过机械合金化与放电等离子体烧结(SPS)制备了添加量为0.5wt%~4.0wt%SmB_(6)的SmB_(6)-316L中子屏蔽材料,使用SEM和EBSD分析样品的微观组织。通过EPMA研究了样品中析出相的元素分布,并探究了SmB_(6)添加量对样品拉伸性能的影响。结果表明:SmB_(6)-316L样品中析出相主要分布在晶界与三叉晶界处,其主要成分为Sm、Si的氧化物和Cr-B化合物等。随着SmB_(6)添加量的增加,样品的晶粒尺寸减小,析出相含量增加且尺寸增大。不同SmB_(6)含量的SmB_(6)-316L样品均呈现韧性断裂。随着SmB_(6)添加量的增加,样品的强度增加但伸长率下降,这是因为SmB_(6)的过量添加会增大析出相的含量和尺寸,导致样品的伸长率大幅降低。当SmB_(6)添加量为1.0wt%~2.0wt%时,可获得综合力学性能较优的SmB_(6)-316L材料。In order to obtain a novel neutron shielding material with better mechanical properties,SmB_(6)-316L neutron shielding materials with 0.5wt%-4.0wt%SmB_(6) content were prepared by mechanical alloying and spark plasma sintering(SPS).The microstructures of the samples were analyzed using SEM and EBSD,the elemental distribution of the precipitated phases in the samples was studied by EPMA and the effect of SmB_(6) addition on the tensile properties of the samples were explored.The results show that the precipitated phases in SmB_(6)-316L samples are mainly distributed at the grain boundaries and trigeminal grain boundaries,and its main components are the oxides of Sm,Si and Cr-B compounds.With the increase of SmB_(6),the grain size of the sample decreases,the size and content of the precipitated phase increases.All the SmB_(6)-316L samples with different SmB_(6) contents are ductile fracture.With the increase of SmB_(6) content,the strength of the samples increase and the elongation decreases.Excessive addition of SmB_(6) increases the content and size of precipitated phases,resulting in a significant elongation reduction.When the contents of SmB_(6) are 1.0wt%-2.0wt%,the SmB_(6)-316L samples with good mechanical properties are obtained.
分 类 号:TG142.71[一般工业技术—材料科学与工程]
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