石墨材料的辐照损伤一直是核石墨研发的主要问题,目前对其辐照损伤程度的准确计算仍缺乏系统的研究。SRIM程序可模拟离子束辐照靶材料,常用来计算辐照损伤程度的定量指标dpa(displacements per atom)。本研究利用SRIM进行离子注入石墨...石墨材料的辐照损伤一直是核石墨研发的主要问题,目前对其辐照损伤程度的准确计算仍缺乏系统的研究。SRIM程序可模拟离子束辐照靶材料,常用来计算辐照损伤程度的定量指标dpa(displacements per atom)。本研究利用SRIM进行离子注入石墨的模拟,选取常用的K-P模式与Full Cascade模式,通过改变入射离子的质量和能量,探究了两种模式下dpa计算结果的规律及差异,并与Fe靶的计算结果作了对比。结果表明,SRIM程序两种模式之间的差异与入射离子的质量有关,随着入射离子质量的增加,两种模式之间的差异降低,与Fe靶中计算的变化趋势相反;无论是C靶还是Fe靶,两种模式之间的差异与入射离子的能量无关。展开更多
Radiation-induced atomic displacement damage is a pressing issue for materials.The present work investigates the number of atomic displacements using the Primary Knock-on Atom (PKA) energy E_(PKA)and threshold displac...Radiation-induced atomic displacement damage is a pressing issue for materials.The present work investigates the number of atomic displacements using the Primary Knock-on Atom (PKA) energy E_(PKA)and threshold displacement energy E_(d)as two major parameters via lowenergy SRIM Binary Collision Approximation (BCA) full cascade simulations.It is found that the number of atomic displacements cannot be uniquely determined by E_(PKA)/E_(d )or E_(D) /E_(d)(E_(D) refers to the damage energy) when the energy is comparable with E_(d).The effective energy E_(D,eff)proposed in the present work allows to describing the number of atomic displacements for most presently studied monatomic materials by the unique variable E_(D,eff)/E_(d).Nevertheless,it is noteworthy that the BCA simulation damage energy depends on E_(d),whereas the currently used analytical method is independent of E_(d).A more accurate analytical damage energy function should be determined by including the dependence on E_(d).展开更多
通过SRIM软件对入射He^+离子在1060铝合金中的射程及分布进行了模拟,利用扫描电子显微镜(Scanning electron microscopy,SEM)和透射电子显微镜(Transmission electron microscopy,TEM)对离子辐照在合金中所诱发的表面形貌、微观结构及...通过SRIM软件对入射He^+离子在1060铝合金中的射程及分布进行了模拟,利用扫描电子显微镜(Scanning electron microscopy,SEM)和透射电子显微镜(Transmission electron microscopy,TEM)对离子辐照在合金中所诱发的表面形貌、微观结构及其形成机制进行了研究。结果表明,He^+离子辐照会导致试样表面出现辐照坑状结构,提高辐照剂量会增加辐照坑的尺寸。辐照合金中会出现杂质元素的区域富集现象,其中Si元素的富集尤为明显,在较高剂量辐照合金中这一现象越显著。此外,辐照还会导致合金中形成位错、位错环、气泡等微观结构及相应的演化结构。由于表面和这些微观结构在原子扩散的过程中可以作为缺陷阱捕获尺寸较小的杂质原子,因而这也是He^+离子辐照铝合金中出现Si元素富集的主要机制。展开更多
在空间探测应用领域,石墨烯薄膜因其低厚度特性,成为一种受到研究者关注的新材料.针对利用石墨烯薄膜替代碳膜作为星载薄膜式飞行时间(Time of Flight,TOF)系统中透射薄膜材料的应用情景,采用粒子透射仿真软件SRIM和粒子光学仿真软件SIM...在空间探测应用领域,石墨烯薄膜因其低厚度特性,成为一种受到研究者关注的新材料.针对利用石墨烯薄膜替代碳膜作为星载薄膜式飞行时间(Time of Flight,TOF)系统中透射薄膜材料的应用情景,采用粒子透射仿真软件SRIM和粒子光学仿真软件SIMION进行联用的方法,进行石墨烯薄膜和碳膜在TOF系统中具体表现的计算机仿真模拟,得到了飞行时间谱图、散斑分布与散角、探测效率等指标的对比结果.仿真结果表明,应用于星载TOF系统的石墨烯薄膜相比碳膜表现出更好的质谱分辨、更小的散斑半径和散角以及更高的探测效率,表明使用石墨烯薄膜替代碳膜可明显提升薄膜式TOF系统的性能.对该结论的进一步证明则需要对应的实验测试数据和结果.相关结果可为后续对石墨烯薄膜进行实际测试以及其他相关研究提供参考.展开更多
Functionally graded composite/hybrid materials(FGCM/FGHCM)were produced by adding B_(4)C,TiO_(2),and B_(4)C+TiO_(2)ceramic materials at various ratios(0-50%)into the AA6082 matrix.The analysis of the damage caused by^...Functionally graded composite/hybrid materials(FGCM/FGHCM)were produced by adding B_(4)C,TiO_(2),and B_(4)C+TiO_(2)ceramic materials at various ratios(0-50%)into the AA6082 matrix.The analysis of the damage caused by^(60) ions'(1.173-1.1332 MeV)on the material was examined using the SRIM/TRIM Monte Carlo simulation software.In the simulation,the following data regarding the atoms of the target materials were obtained:ion distribution,target ionization,total displacements,surface binding energy,lattice binding energy,and displacement energy.Among the studied four materials,the one with the highest ion range value was found to be AA6082 with 8550A.TiO_(2)was found to be the reinforcement material that reduced the ion range the most in the material.Due to its high binding energy,B_(4)C reinforced AA6082+(0-50%)B_(4)C FGCM was found to have the least vacancy with 4782/ion.展开更多
文摘石墨材料的辐照损伤一直是核石墨研发的主要问题,目前对其辐照损伤程度的准确计算仍缺乏系统的研究。SRIM程序可模拟离子束辐照靶材料,常用来计算辐照损伤程度的定量指标dpa(displacements per atom)。本研究利用SRIM进行离子注入石墨的模拟,选取常用的K-P模式与Full Cascade模式,通过改变入射离子的质量和能量,探究了两种模式下dpa计算结果的规律及差异,并与Fe靶的计算结果作了对比。结果表明,SRIM程序两种模式之间的差异与入射离子的质量有关,随着入射离子质量的增加,两种模式之间的差异降低,与Fe靶中计算的变化趋势相反;无论是C靶还是Fe靶,两种模式之间的差异与入射离子的能量无关。
基金supported by the Fundamental Research Funds for the Central Universities,Sun Yat-sen University (No. 2021qntd12)。
文摘Radiation-induced atomic displacement damage is a pressing issue for materials.The present work investigates the number of atomic displacements using the Primary Knock-on Atom (PKA) energy E_(PKA)and threshold displacement energy E_(d)as two major parameters via lowenergy SRIM Binary Collision Approximation (BCA) full cascade simulations.It is found that the number of atomic displacements cannot be uniquely determined by E_(PKA)/E_(d )or E_(D) /E_(d)(E_(D) refers to the damage energy) when the energy is comparable with E_(d).The effective energy E_(D,eff)proposed in the present work allows to describing the number of atomic displacements for most presently studied monatomic materials by the unique variable E_(D,eff)/E_(d).Nevertheless,it is noteworthy that the BCA simulation damage energy depends on E_(d),whereas the currently used analytical method is independent of E_(d).A more accurate analytical damage energy function should be determined by including the dependence on E_(d).
文摘通过SRIM软件对入射He^+离子在1060铝合金中的射程及分布进行了模拟,利用扫描电子显微镜(Scanning electron microscopy,SEM)和透射电子显微镜(Transmission electron microscopy,TEM)对离子辐照在合金中所诱发的表面形貌、微观结构及其形成机制进行了研究。结果表明,He^+离子辐照会导致试样表面出现辐照坑状结构,提高辐照剂量会增加辐照坑的尺寸。辐照合金中会出现杂质元素的区域富集现象,其中Si元素的富集尤为明显,在较高剂量辐照合金中这一现象越显著。此外,辐照还会导致合金中形成位错、位错环、气泡等微观结构及相应的演化结构。由于表面和这些微观结构在原子扩散的过程中可以作为缺陷阱捕获尺寸较小的杂质原子,因而这也是He^+离子辐照铝合金中出现Si元素富集的主要机制。
文摘在空间探测应用领域,石墨烯薄膜因其低厚度特性,成为一种受到研究者关注的新材料.针对利用石墨烯薄膜替代碳膜作为星载薄膜式飞行时间(Time of Flight,TOF)系统中透射薄膜材料的应用情景,采用粒子透射仿真软件SRIM和粒子光学仿真软件SIMION进行联用的方法,进行石墨烯薄膜和碳膜在TOF系统中具体表现的计算机仿真模拟,得到了飞行时间谱图、散斑分布与散角、探测效率等指标的对比结果.仿真结果表明,应用于星载TOF系统的石墨烯薄膜相比碳膜表现出更好的质谱分辨、更小的散斑半径和散角以及更高的探测效率,表明使用石墨烯薄膜替代碳膜可明显提升薄膜式TOF系统的性能.对该结论的进一步证明则需要对应的实验测试数据和结果.相关结果可为后续对石墨烯薄膜进行实际测试以及其他相关研究提供参考.
基金the Scientific Research Projects Office of Gazi University,Turkiye(Grant Nos.FGA-2022-7521 and FKA-2023-8617)the financial support of TUBITAK 2211-C and YOK 100/2000 programs。
文摘Functionally graded composite/hybrid materials(FGCM/FGHCM)were produced by adding B_(4)C,TiO_(2),and B_(4)C+TiO_(2)ceramic materials at various ratios(0-50%)into the AA6082 matrix.The analysis of the damage caused by^(60) ions'(1.173-1.1332 MeV)on the material was examined using the SRIM/TRIM Monte Carlo simulation software.In the simulation,the following data regarding the atoms of the target materials were obtained:ion distribution,target ionization,total displacements,surface binding energy,lattice binding energy,and displacement energy.Among the studied four materials,the one with the highest ion range value was found to be AA6082 with 8550A.TiO_(2)was found to be the reinforcement material that reduced the ion range the most in the material.Due to its high binding energy,B_(4)C reinforced AA6082+(0-50%)B_(4)C FGCM was found to have the least vacancy with 4782/ion.
