Effects of forging temperature on Al3Ti particle distribution in Al-Al3Ti multi-phase materials deformed by multi-directional forging

Abstract

The effects of forging temperature on the distribution of Al3Ti platelet particles in Al-Al3Ti multi-phase materials deformed by multi-directional forging (MDF) are investigated. The Al-Al3Ti multi-phase materials consist of large Al3Ti platelet particles and α-Al matrix. The MDF is performed at either room temperature (RT) or 573 K, and the Al3Ti platelet particles are refined at both temperatures. The refined particles in the specimen subjected to MDF at 573 K are larger than those in the specimen subjected to MDF at RT. This size difference can be explained by dynamic recrystallization of the a-Al matrix during MDF. Furthermore, the change in the spatial distribution of the refined Al3Ti particles in the forged specimens is evaluated using Morishita's index. Based on the results, it is found that the spatial distribution of the particles changes depending on the plastic flow of the a-Al matrix during MDF. In addition, the change in spatial distribution of the particles is greater when MDF is carried out at RT than at 573 K. Therefore, it is concluded that the size and spatial distributions of the Al3Ti platelet particles in the Al-Al3Ti multi-phase materials deformed by the MDF depend on the forging temperature.