Which of the following increases castability of base metal alloys________________?
Correct answer: B. Beryllium
- A. Tin
- B. Beryllium
- C. Molybdenum
- D. Carbon
Explanation
Beryllium lowers the melting temperature and improves fluidity and castability of cobalt-chromium base-metal alloys. Molybdenum mainly improves strength and corrosion resistance, whereas excessive carbon can promote carbide formation.
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