ON THE STRUCTURE OF IRRADIATION-INDUCED COLLISION CASCADES IN METALS AS A FUNCTION OF RECOIL ENERGY AND CRYSTAL-STRUCTURE
ON THE STRUCTURE OF IRRADIATION-INDUCED COLLISION CASCADES IN METALS AS A FUNCTION OF RECOIL ENERGY AND CRYSTAL-STRUCTURE
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DOI：
10.1080/01418619308207167
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发表时间：
1993-02-01
期刊：
影响因子：
--
通讯作者：
SINGH, BN
中科院分区：
文献类型：
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作者：
HEINISCH, HL;SINGH, BN
用二元碰撞码MARLOWE研究了f.c.c、b.c.c和h.c.p金属的级联尺寸、缺陷密度和亚级联构型与反冲能量高达1mev的关系。子级联形成的阈值能量是根据级联碰撞阶段后缺陷形态的定义来确定的。设计了一种识别子叶栅的计算方法，并利用该方法确定了子叶栅的数量和间距与反冲能量的关系。结果说明了反冲能量、原子质量密度和晶体结构对级联碰撞阶段后的级联体积和空位密度的影响，以及对亚级联数量和亚级联间距的影响。碰撞阶段的级联形态决定了每个级联发展过程中缺陷产生和聚集的初始条件，并影响着微观结构的整体演变。与实验观测结果的比较说明了高能量密度和低能量密度叶栅结构的根本差异。
The binary collision code MARLOWE is used to study cascade sizes, defect densities and subcascade configurations in f.c.c., b.c.c. and h.c.p. metals as a function of recoil energy up to 1 MeV. The threshold energies for the formation of subcascades are determined using a definition based on the defect configuration after the collisional phase of the cascade. A computational method was devised for identifying subcascades, and it was used to determine the number and spacing of subcascades as a function of recoil energy. The results are presented to illustrate the effect of recoil energy, atomic mass density and crystal structure on cascade volume and vacancy density after the collisional phase of the cascade, and on the number of subcascades and the subcascade spacing. The cascade morphology in the collisional phase sets the initial conditions for defect production and clustering during the development of each cascade, as well as influencing the global evolution of the microstructure. Comparisons with experimental observations illustrate fundamental differences in cascade structure for cascades of high and low energy density.