,Molecular dynamics study of mosaic structure in the Ni-based single-crystal superalloy

来源 :中国物理(英文版) | 被引量 : 0次 | 上传用户:Aweichunxing890620
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The mosaic structure in a Ni-based single-crystal superalloy is simulated by molecular dynamics using a potential employed in a modified analytic embedded atom method. From the calculated results we find that a closed three dimensional misfit dislocation network, with index of <011>{100} and the side length of the mesh 89.6(A), is formed around a cuboidal γ’ precipitate. Comparing the simulation results of the different mosaic models, we find that the side length of the mesh only depends on the lattice parameters of the γ and γ’ phases as well as the γ/γ’ interface direction, but is independent of the size and number of the cuboidal γ’ precipitate. The density of dislocations is inversely proportional to the size of the cuboidal γ’ precipitate, i.e. the amount of the dislocation is proportional to the total area of the γ/γ’ interface, which may be used to explain the relation between the amount of the fine γ’ particles and the creep rupture life of the superalloy. In addition, the closed three-dimensional networks assembled with the misfit dislocations can play a significant role in improving the mechanical properties of superalloys.
其他文献
We first experimentally demonstrate a laser-diode end-pumped self-Q-switched and mode-locked Nd,Cr:YAG green laser with a KTP crystal as the intra- cavity frequ
本试验选用郑单958为试验材料,于2009~2012年在山东省泰安市大汶口镇东侯村(36°11′N,117°06′E,海拔178m)进行研究。试验设有综合农艺管理试验(Integratedagronomic management experiment, MT)和施氮量试验(Nitrogen test, NT),研究了综合农艺管理对夏玉米产量和氮效率的影响。主要研究结果如下:1综合农艺管理对夏玉米产
The photoionization of seeded carbon bisulfide molecular beam by a 1064 nm nanosecond Nd-YAG laser with intensities varying from 0.8 × 1011 to 5.6 × 1011 W/cm
从飞机上俯瞰,菲律宾的七千多个岛屿,就象一颗颗晶莹的珍珠,撒落在碧波万顷的太平洋上,真是美不胜收。今年六月,我随中国广播电视代表团访问菲律宾。我们参观了一些广播电台
One of the long-standing controversial arguments in protein folding is Levinthal’s paradox. We have recently proposed a new nucleation hypothesis and shown tha
The impulsive control of chaotic systems, which are subjected to unbounded exogenous perturbations, is considered. By using the theory of impulsive differential
水稻是重要的粮食作物之一,非生物胁迫(如干旱、盐、低温等)严重影响水稻的生长发育和产量。研究水稻的生长发育及其在环境胁迫下的耐逆机理,对水稻的种质改良有重要的理论和应用价值。TFIIIA型锌指蛋白在水稻非生物胁迫应答过程中起着重要的作用。本实验室报道了一个水稻TFIIIA型锌指蛋白基因ZFP252,过量表达ZFP252基因能够显著增强转基因水稻植株的耐旱性和耐盐性。关于锌指蛋白ZFP252的耐逆机
The yield stress of our newly developed electrorheological (ER) fluids consisting of dielectric nano-particles suspended in silicone oil reaches hundreds of kPa
A mechanical model of liquid crystals (LCs) is applied to study the polymorphism of homologous series of terphenyl compounds. With a semi-experimental molecular
In software engineering, class diagrams are often used to describe the system’s class structures in Unified Modelling Language (UML). A class diagram, as a gra