位错攀移

蠕变应力指数表明，该合金在760℃~815℃，80MPa~300MPa的蠕变条件下，合金的蠕变受位错攀移控制。

Creep stress exponents show that at 760 ℃ ~ 815 ℃, 80 MPa ~ 300 MPa , the creep mechanism of this alloy is dislocation climb .

合金应力指数n和蠕变激活能Q分别为3.36和245kJ/mol，该合金的蠕变变形是由位错攀移机制所控制的。

The values of stress exponent and the activation energy for creep were calculated 3.36 and 245 kJ / mol respectively . Based on the analyses , the dominant creep deformation mechanism was controlled by the dislocation climb .

通过计算两种合金的应力指数和蠕变激活能，L2合金的蠕变机制是受晶界滑动控制的，而N2合金为位错攀移机制控制。

It can be inferred the creep mechanism of L2 and N2 was controlled by grain boundaries sliding and dislocation climb respectively through the calculation of stress exponent and creep activation energy .

三种合金在（423K-473K）／（50MPa-90MPa）的实验条件下合金的蠕变机制为受扩散控制的位错攀移机制。

The creep mechanism of the alloy are controlled by diffusion and dislocation climb mechanism under the experimental conditions of ( 423K-473K ) / ( 50MPa-90MPa )

两种复合材料的蠕变机制均为位错攀移机制。

The creep mechanisms of both composites are dislocation-climbing mechanism .

高温合金蠕变位错攀移控制的空洞形核时间

On the Cimb-Controlled Creep Cavity Nucleated Time of Alloy in High Temperature

该合金的蠕变由晶格自扩散引起的位错攀移所控制。

The creep deformation is controlled by dislocation climb resulting from lattice self-diffusion .

位错攀移越过晶内弥散分布的第二相质点；

Dislocations climb up and over the dispersed particles ;

扩展位错攀移的高温蠕变机制

The mechanism of high temperature creep associated with the climb of extended dislocations

蠕变机制主要为位错攀移控制机制。

Dislocation-climbing mechanism was revealed in creep process .

按照位错攀移模型，提出一种第二阶段蠕变机理。

A mechanism for secondary stage creep has been proposed according to the climbing model .

位错攀移越过弥散质点的过程是合金超塑变形的速控过程，超塑变形的主要机制是晶界滑移伴随晶内位错运动。

For the alloy , the dominant mechanism of superplastic deformation is that the boundary sliding process will be accompanied by intragranular dislocations .

用耦合模型对内耗数据的分析表明，小角度晶界内耗的基本机制是位错攀移，而大角度晶界内耗的基本机制是晶界扩散。

An analysis of the internal friction data by a coupling model shows that the basic mechanism of GB internal friction for low-angle GBs is dislocation climb , while that for high-angle GBs is GB diffusion .

合金的高温塑性好，蠕变研究表明，该合金在700&900℃蠕变由位错攀移控制，其蠕变激活能为439kJ/mol，应力敏感系数为4。

And it is ductile at high-temperature . The creep in the alloy at 700 & 900 ℃ is controlled by dislocations climb , and creep activity energy is 439 kJ / mol , stress factor is 4 .

东部石英的变形机制为位错攀移成为重要的蠕变机制，为高温塑性变形机制，西部石英则以脆性微破裂、位错滑移与重结晶为主。

Dislocation climb creep has become an important deformation mechanism of eastern quartz . It is a high-temperature plastic deformation mechanisms . However the deformation mechanism of western quartz is based brittle microfracture , dislocation glide and recrystallization .

蠕变阻力包括两部分：第一项是位错攀移临界口槛应力，与施加应力无关；第二项是与施加应力有关的阻力项，代表了其他强化机制的贡献。

In this case , the resistant stress has two components : a threshold stress term defined by the minimum stress required for various climb mechanism , and a friction stress term represented by the contribution of solid-solution strengthening and dislocation strengthening , which is strongly dependent on applied stress .

变形合金的透射电镜照片表明位错的攀移和交滑移为合金变形的主要机制。

The TEM photo shows that dislocation climb and cross-slip are the important deformation modes of the alloy .

稳态蠕变速率主要由锌的点阵扩散和位错的攀移所控制，品界滑移对蠕变也有贡献。

The compressive creep rate in the alloy was mainly controlled by the lattice diffusion of zinc and dislocation limb , and the grain boundary sliding contributed for it in some degree .

非共格界面为位错的攀移运动提供了有效的扩散通道，Cu/Nb和Ag/Fe多层膜的蠕变抗力随周期减小而减小。

For fcc / bcc Cu / Nb and Ag / Fe multilayers , the incoherent interfaces can provide effective climb diffusion paths and thus the creep resistance decreases with decreasing periodicity .

相反，共格界面的形成不利于位错的攀移运动，Cu/Ni和Cu/Co多层膜的蠕变抗力随周期减小而增大。

On the other hand , the formation of coherent interfaces is disadvantageous to the dislocation climb process and creep resistance of Cu / Ni and Cu / Co multilayers increases with decreasing periodicity .

在文献[1]提出的扩展割阶束集模型的基础上，求出了在外加应力作用下割阶束集所需的时间和扩展位错的攀移速率，从而推导出稳态蠕变速率的表达式。

Based on the model for the contraction of extended jogs [ 1 ] , the time needed for the contraction under the action of applied stress and the climb velocity of extended dislocations are derived . And consequently , an expression of the steady state creep rate is obtained .

不同发展阶段的机制均为位错滑移成攀移的结果。

The mechanisms of the three stages are slide or climbing of dislocation .

超塑性变形的主要机理是位错滑移和攀移产生的应变硬化与动态回复和动态再结晶的应变软化作用相平衡。

The main deformation mechanism of superplasticity is the balance between strain hardening .

本论文所研究的金属纳米多层膜的室温蠕变机制都是位错滑移-攀移机制。

The creep process of all the investigated multilayers is dominated by dislocation glide-climb mechanism .

同时，振动促进了与塑性变形有关的位错滑移与攀移，为材料的动态再结晶提供了必要条件。

Vibration promoted the dislocation slipping and climbing , which was necessary for dynamic recrystallization .

在523K-623K压缩温度范围内，试验材料的热激活能均小于铝的晶界自扩散激活能，表明该温度范围内试验材料的变形机制是以晶内位错滑移及攀移为主要特征。

The thermal activation energies of all test material composites were lower than the thermal activation energy of self-diffusion of grain boundary ranged the temperatures from 523K to 623K , which indicated that the deformation mechanism were characterized by sliding and climbing of dislocations in the grains .

稳态期间，基体中运动位错可通过界面位错网攀移越过筏状γ相；

The motion dislocations in the 7 matrix may climb over the rafts γ ' phase by means of the dislocation networks during steady creep .

在研究的实验条件范围内，合金的蠕变变形机制为低温高应力下的位错粘滞滑移控制和高温低应力下的位错攀移控制；

The creep mechanisms are dislocation glide at lower testing temperatures in higher stress levels and dislocation climb at higher temperatures in lower stress levels .

室温时效未加载的试样没有位错环和蜷线位错，疲劳断裂的试样有一些不规整的蜷线位错，这种蜷线位错是通过位错攀移而形成的。

In unloaded room aging specimens no loop and helical dislocation are found , but in the fatigue fractured samples they are found , some irregular helical dislocations formed by the climbing of dislocations .