Development of heat-resistant magnesium alloys with high strength by utilizing Laves phases

通过对Mg-Al-Ca压铸合金蠕变过程的TEM观察，描述了蠕变过程中位错的运动规律。在压铸过程中，位错被引入初级α晶粒内部。位错基段在应力作用下能够在基面上弯曲和滑动，而在蠕变过程中，位错的凹凸部分借助于攀移跟随基段。Laves相可以降低位错的攀移速度。

A description of dislocation movements during creep has been developed through a detailed TEM observation for the Mg-Al-Ca die-cast alloy. Dislocations are introduced within the primary α grain interior in the die-cast process. The basal segments of dislocations are able to bow out and glide on the basal planes under the influence of a stress, and the jogs follow the basal segments with the help of climb during creep. The Laves phase can decrease the climb velocity of dislocations.