空位团

γ-Fe中点缺陷与氦-空位团簇的形成能

Formation energies of point defects and helium & vacancy clusters in γ - fe

位错线上单位长度的吸引能随着空位团浓度的降低而降低。

The energy per unit length decreases as the concentration of vacancy clusters decreases .

Ni3Al金属间化合物中空位团稳定构型的计算机模拟研究

Computer Simulation on the Stable Structure of Vacancy Clusters in Ni_3Al Alloy

在580°C左右实验观察到辐照肿胀峰，在21和33dpa辐照剂量下相应的空位团分别由14和19个空位组成，尺度分别为0.68和0.82nm。

A radiation swelling peak was observed at ~ 580 ℃ where the vacancy cluster contains 14 and 19 vacancies and has an average diameter of 0.68 and 0.82 nm , respectively for the 21 and 33 dpa irradiations .

实验结果表明，向样品中掺杂TiO2或者快速冷却样品，都能使得样品晶界处Zn空位团尺寸变大，浓度减小。

It is found that the vacancy defect concentration is decreased and the scale of vacancy defect is increased both in the TiO_2-doped sample and in the sample which cools faster .

小空位团浅能级对正电子的声子激发比捕获率

Phonon-mediated specific trapping rate of POSIT-RONS to the shallow energy level of a small vacancy cluster

在稳定存在的空位团中，每个空位都尽可能地与其他空位保持最近邻关系；

In the most stable configuration , each vacancy endeavors to form a nearest neighbor relationship with other vacancies .

从所测得正电子寿命、强度参数的变化获知高温退火后空位团的增长行为以及氢原对空位团长大的影响。

The void growth and the influence of the hydrogen atoms on the void growth after successive high temperature annealing were clearly detected through the changes of positron lifetime parameters and were discussed in detail .

氢在峰值时效合金中不进入γ′／γ界面，而是主要进入含少量碳化物的晶界和晶内空位团，使合金塑性显著降低；

In peak aged alloy , hydrogen entered the grain boundaries with a little amount of carbides and inter-grain vacancy clusters rather than γ′ / γ interface , resulting in an obvious drop of plasticity ;

空位团尺寸随辐照剂量增加，在100dpa时空位团由8个空位组成，尺度为0.55nm。

The size of the vacancy clusters increases with the increasing of irradiation dose , and the vacancy cluster produced at 100 dpa consists of 8 vacancies and reaches a size of 0.55 nm in diameter .

若小空位团中存在束缚能小于晶体德拜能量的正电子捕获态，则这一能态对自由正电子的捕获具有较强的温度依赖性。

If there is a trapped state of a positron with binding energy lower than Debye energy at a small vacancy cluster , the capture of positrons from free state to this level will be strong temperature dependent .

金属中空位及空位团的正电子寿命谱

Positron annihilation lifetime spectrum for vacancy and void in metal

空位、小空位团的三态模型与正电子比捕获率的温度依赖性

Three state model of vacancies and small vacancy clusters and temperature dependence of specific trapping rate

本文采用三态捕获模型分析空位、小空位团的正电子的捕获过程，解释了比捕获率负温度依赖性的实验结果。

The trapping process of positrons into vacancies and small vacancy clusters is described by a Three State Model . The experimental results of negative temperature dependence of specific trapping rate are explained theoretically .

观察到形变样品阴极充氢后，氢致缺陷为一定量的位错和空位以及少量的空位团。

Experimental results indicate that the cathodic hydrogen-charging of deformed sample further introduce an additional amount of dislocations and vacancies as well as some vacancy clusters into it .

由此提出氢与空位互作用形成以氢为核心的空位团的机制，解释了实验中观察到的现象。

It is suggested that hydrogen atoms can act as centers of vacancy agglomeration , leading to the formation of vacancy cluster .

随辐照剂量的增大，单空位、双空位和位错浓度增加，空位团的尺度和浓度都随之增大。

The concentrations of the mono-and di-vacancies and dislocations and both the concentration and size of the vacancy clusters or voids all increase with the increasing of the irradiation dose .

还提出了活化稀土原子，在γ&Fe中提高平衡空位浓度，形成较多的双空位和原子空位团通道的扩散模型。

It also proposes that balanced blank density of γ - Fe is raised by activation rare earth atoms and diffusion model that the way of " double blank " and " atomblank ball " are formed .

从这些深中心缺陷的不同淬火和退火行为，可以认为缺陷中心主要是样品在激光退火过程中产生的过饱和空位所形成的，而且可能是与某种大空位团有关。

The behavior of these centers for various thermal quenching and anne-aling procedures provides evidence that these hole traps result from supersaturated vacancy , and probably are related to a certain large vacancy cluster .

单空位的回复温度范围为73260℃，位错和空位团的退火发生在350670℃温度范围。

The recovery temperature range of vacancies is 73-260 ℃; the annealing of dislocations and vacancy clusters occur in the range of 350-670 ℃ .

其次，为了解释He-空位作用与氦泡形成之间的关系，采用第一性原理方法考察了He和空位的扩散行为，He、空位和He-空位团簇的稳定性。

Secondly , to explain the relationship between He-vacancy interactions and He bubble formation , first-principles calculations studied diffusion behavior of He and vacancy , stability of He , vacancies and of He-vacancy clusters .