DTIC ADA150881: Ordered Carbon Metal Alloys for pdf

DTIC ADA150881: Ordered Carbon Metal Alloys for

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Theoretical methods of predicting ordering parameters of carbon metal based systems have been investigated. Preliminary methods of calculating the critical ordering temperature, and the maximum degree of order have been used to examine the characteristics of C-Zr, C-Mo, C-Ti and C-V systems. Based upon these calculations, the C-Ti system has been chosen as the most promising system in which the ultrahigh strength, ductility and temperature resistance, properties desired for space power generation materials, can be obtained. Fifteen titanium based alloys have been manufactured using an arc melting furnace to compare experimentally the effect of carbon content on the ordering parameters of carbon metal alloys with theoretical predictions. The alloys produced contained between 0 and 53 atom percent (0 to 22 weight percent) carbon. This first group of alloys did not contain transition and rare earth additions required for ductility improvement. This will allow an unperturbed comparison of ordering parameter theory with experimental results.

Optical metallography and hardness tests have been completed on these alloys with interesting results for alloys containing between 35 and 53 atomic percent (12 to 22 weight percent) carbon. These all were found to contain significant amounts of phases not predicted from the phase diagrams. X-ray diffraction tests are being conducted to identify these constituents. An additional ten alloys have been manufactured using a new induction generator purchased under the contract. Originator supplied keywords include: Cluster-variation, Concentration waves and Band theory

• Creator/s: Defense Technical Information Center
• Date: 7/31/1984
• Year: 1984
• Book Topics/Themes: DTIC Archive, Chin, B A, AUBURN UNIV AL DEPT OF MECHANICAL ENGINEERING, *COMPUTATIONS, *MATHEMATICAL PREDICTION, *CARBON ALLOYS, SPACE ENVIRONMENTS, POWER SUPPLIES, DUCTILITY, HARDNESS, TITANIUM ALLOYS, METALLOGRAPHY, THERMAL RESISTANCE

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