材料期刊网

本文叙述用真空热侵蚀方法研究α-铁再结晶后,晶粒长大晶界迁移的一些结果.观察到晶粒长大与晶粒内部的亚结构有着密切关系,一般是无精细亚结构的晶粒向有精细亚结构的晶粒长大,晶界迁移的速度也较快.通过仔细分析晶界迁移后遗留下来的槽沟,认为α-铁晶粒长大晶界迁移符合以下一些见解:1.晶界迁移的动力来源为晶粒界面间自由能.2.晶粒消失的过程与在半抽真空的容器中,肥皂泡消失的过程基本上相似.3.Burke所提出的旧晶粒界消失与新晶粒界形成的模型.4.晶粒长大是一个不连续的过程.

Grain boundary migration in recrystallised Armco iron during grain growth has been studied by vacuum etching method. It was found that grain growth in recrystallised α-ferrite is closely related with substructures within the ferrite grains, grains containing no substructures usually grow at the expense of those possessing substructures.Through tracing and analysing the remaining grooves of the migrating grain boundaries and together with other observations, we have confirmed the following theories suggested by previous investigators.1. The main driving force for grain boundary migration is interfacial energy of the grains.2. The manner in which grains in metals disappear is basically the same as that of soap bubbles in a semi-evacuated container.3. Burke's model for the formation of new grain boundaries at the expense of old ones.4. Grain growth is a discontinuous process.