蠕变一般是指材料在恒定应力作用下，随着时间延长而发生的缓慢且持续的非弹性形变。由于温度升高，由热激活控制的形变过程如位错的交截和交滑移等，以及由扩散控制的形变过程如位错的攀移、空位的定向扩散和晶界滑移等，都能快速进行，因此蠕变现象会随着温度的升高愈加显著。虽然材料在使用条件下所受的应力往往是复杂的，但是通常引起蠕变的应力主要是拉伸应力。介绍了合金的高温蠕变机理、分子动力学研究方法和FeCrAl合金蠕变行为的研究现状。

Creep generally refers to the slow and continuous inelastic deformation of a material under constant stress over time. Due to the increase of temperature, deformation processes controlled by thermal activation, such as dislocation crossing and slip, and deformation processes controlled by diffusion, such as dislocation climbing, vacancy directional diffusion and grain boundary slip, can proceed rapidly. Therefore, creep phenomenon will become more and more significant with the increase of temperature. Although the stresses subjected to materials under service conditions are often complex, the stresses that usually cause creep are mainly tensile stresses. The high temperature creep mechanism, molecular dynamics method and creep behavior of FeCrAl alloy are introduced.