晶界扩散控制晶界滑动是低温超塑行为的主要机理。
Grain sliding controlled by grain boundary diffusion is the main mechanism for low temperature superplastic behavior.
合金在超塑变形中，位错滑移起重要协调作用，使晶界滑动易于进行。
In the process of superplastic deformation, the dislocation sliding has important cordinating effect, so that the grain boundary sliding proceeds easily.
超塑性变形的微观机制是以晶界滑动为主，晶内变形以及位错蠕变起了协调作用。
The principal superplastic deformation mechanism for the alloy is boundary sliding, assistant ones are deformations inside the grains and dislocations creep.
在最佳超塑性条件下，断口中形成了大而深的空洞，晶界滑动和晶间断裂特征明显。
The deep and large cavities are formed on fracture surface and grain boundary sliding and intergranular fracture characteristic is obvious on the optimal superplastic deformation condition.
结果表明，变形温度愈高，晶界结合强度愈低，沿晶断裂愈明显，晶界滑动愈易实现；
The results showed that the grain boundary cohesion become weaker and intergranular fracture became dominant with the increasement of superplastic deformation temperature.
超塑性变形的主要机制是细小晶粒的晶界滑动，适当的微量液相有利于该复合材料的高应变速率超塑性。
The dominant process of superplastic deformation is fine grain boundary sliding, and an appropriately small amount of liquid phase can enhance the high strain rate superplasticity of the composite.
蠕变期间，晶内碳化物阻碍位错运动，晶界碳化物“钉扎”晶界，阻碍晶界滑动，由此提高钢的蠕变抗力。
The carbides in the matrix prevent dislocation from moving, and pin effect of the carbides in the grain boundary keep grain boundary from sliding, and creep resistance of steel is improved.
蠕变期间，晶内碳化物阻碍位错运动，晶界碳化物“钉扎”晶界，阻碍晶界滑动，由此提高钢的蠕变抗力。
The carbides in the matrix prevent dislocation from moving, and pin effect of the carbides in the grain boundary keep grain boundary from sliding, and creep resistance of steel is improved.
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