Question

Refractory oxides do not have any effect on molten titanium metal at the time of casting process.

(a) True

(b) False

The question was asked during an interview for a job.

I would like to ask this question from Melting of Titanium Alloys topic in portion Foundry Introduction & Materials of Casting-Forming-Welding II

Answer 1

The correct answer is (b) False

The best I can explain: Most of the refractory oxides like zirconia and alumina react with molten titanium to generate a layer which is enriched in oxygen or inter-metallic compounds of titanium. The oxide mixes in molten titanium which gives rise to a contaminated layer that can be considered as precipitate as a separate phase on cooling.