THE EFFECT OF CERIUM ON THE HEAT TREAT RESPONSE OF PRECIPITATION-HARDENING TITANIUM ALLOYS
A study was made of the effect found in combining the weak precipitation- hardening alloys of titanium, Ti--Ag, Ti-Cu, and Ti-Si, with the more intense precipitationhardening but hot-short Ti-Ce alloys. Metallography, x-ray diffraction, and hardness testing were used for the study. Aging of the alloys was performed in the temperature range 200 to 600 deg C for times from 1/2 to 5 hr. The three ternary alloys Ti-Ag-Ce, Ti-Cu--Ce and Ti--Si-Ce showed appreciable precipitationhardening response. The Ti-Si-Ce ternary showed a double peaking of hardness with aging. A portion of the response in this alloy was due to precipitation of elemental cerium, however, which indicates a hot- short material. The addition of cerium to the Ti-Ag alloy moved peak hardness to shorter times, and maximum hardness to a lower temperature. There is no alleviation of the rapid aging and overaging cycle characteristic of the binary silver alloy, and control of the hardening reaction is difficult. The alloy of titanium with copper and cerium showed pronounced precipitation hardening and a slow overaging reaction. This alloy shows promise of being suitable for commercial application. (auth)
- Research Organization:
- Watertown Arsenal Lab., Mass.
- NSA Number:
- NSA-12-009834
- OSTI ID:
- 4337658
- Report Number(s):
- WAL-TR-401/285
- Country of Publication:
- United States
- Language:
- English
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