I can't speak for other metallurgists, but I assure you my head is in no danger of exploding. It's not possible to write an exact molecular-scale simulation of a system as large as a sword blade, so I'm perfectly comfortable with an empirical description using the terminology of the culture that developed the blade. For me, at least, understanding the metallurgy of a traditionally made Japanese sword only enhances my appreciation of its beauty. So go right ahead.
As for aiki, I'm not sure I completely agree with Dan Richards' definition, but it's a good basis for further discussion.
In my best Cecil Turtle voice: "Uhhhh, Yup..."