His Master's thesis was concerned with metallurgy chiefly alloy interfaces. It was a one year program.
He will need to shift gears a bit, but we've been discussing topics such as heat transfer, and multi-group neutron diffusion, perhaps in high entropy alloys. I wasn't formally trained in these topics, which makes life easier on some level for me; he will require more rigor I suspect.
I suspect he has fairly deep mathematic ability, but we don't discuss it that much. I know he's done a fair amount modeling, and at one point was going to go to Sweden to work with the Thermo-calc people but Covid put an end to that idea. He know he's fairly fluid computationally.
I'm neurotic and living somewhat vicariously through him. Over the years, I've found that I often need to refer to references. He probably doesn't need all that much from me, but his old man can't help meddling, or cheering him on; I don't know how he takes it; he tolerates me. He has never expressed anxiety about a challenge except maybe once when they sent him overseas after his Freshman year.
When I'm dead, maybe thinking of me doing these things will give him a good laugh. I hope so.