I've been trying to find this for the past day and a half and I've seen nothing stating it outright. My character is a chaotic good Magus with the Bladebound archtype.
The rules state that the blade has the same alignment as the character. Our DM has put us up against foes with a DR/good. He argues that the blade does not bypass the DR since it's not the Align Weapon spell used. I looked through the intelligent items rules and it does not specify anything about DR.