ABSTRACT

To understand the mechanism of FCC–HCP martensitic transformation, we applied electron channeling contrast imaging under cooling to −51°C and subsequent heating to 150°C. The stacking faults were randomly extended and aggregated during cooling. The stacking fault aggregates were indexed as HCP. Furthermore, the shrink of stacking faults due to reverse motion of Shockley partials was observed during heating, but some SFs remained even after heating to the finishing temperature for reverse transformation (A_f: 104°C). This fact implies that the chemical driving force of the FCC/HCP phases does not contribute to the motion of a single SF but works for group motion of stacking faults.

抽象的

为了了解FCC-HCP马氏体转变的机理，我们在冷却至-51°C并随后加热至150°C的条件下应用了电子沟道对比成像。堆垛层错在冷却过程中随机扩展并聚集。堆垛层错聚集体索引为HCP。此外，在加热过程中观察到由于肖克利零件的反向运动而引起的堆垛层错的收缩，但是即使加热至用于反向转变的终轧温度（A _f：104°C），仍会残留一些SF 。这个事实表明，FCC / HCP相的化学驱动力不会对单个SF的运动产生影响，但对堆叠故障的组运动起作用。