change field aliases name to match the field name automatically

Hi -
We have an automated process of creating feature class after joining the mutliple tables. During the process, we also rename the field names (I perform this using Make Feature Layer), however in 10.2, I noticed that when the field name are changed, it does not change the alias name automatically. This is a problem for us because when the user views the layer in arcmap it shows the field alias name instead of field name. Is there a tool to change the fields aliases name in the model builder or python script as well? Or is there any other work around so the alias name will match with field name?

Thanks for your help in advance!!