INVESTIGATION OF THE CREEP, FATIGUE AND TRANSVERSE PROPERTIES OF AL3NI WHISKER AND CUAL2 PLATELET REINFORCED ALUMINUM.
Final rept., 12 Apr 65-11 Apr 66,
UNITED AIRCRAFT CORP EAST HARTFORD CONN RESEARCH LABS
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Al3Ni whisker reinforced aluminum was found to exhibit lower minimum creep rates and longer creep life than CuAl2 lamellar reinforced aluminum. The creep behavior of the whisker composite was characterized as having a small minimum creep rate and a rapid period of tertiary creep with a small amount of rupture ductility. The lamellar composite, on the other hand, was found to exhibit a large amount of tertiary creep and rupture ductility. The resistance to creep deformation was found to be significantly greater for Al-A13Ni solidified at 11 cmhr than that solidified at 2 cmhr. The microstructure of Al-Al3Ni after creep testing was found to be essentially unchanged by the combined effects of stress and temperature. A small amount of spheroidization was noted only in localized areas where severe plastic deformation occurred. The low cycle fatigue behavior of Al-CuAl2 was found to be superior to that of Al-Al3Ni. It is postulated that a lamellar reinforcement is more efficient at blocking lateral plastic flow than a rod-like reinforcement. The low cycle fatigue life of Al-Al3Ni was found to be inversely proportional to the square of the strain amplitude, thus correlating with the empirical relationship of Tavernelli and Coffin. Al3Ni whisker reinforced aluminum was found to exhibit a decrease in strength parallel to the whiskers as the solidification rate was decreased. Some transverse reinforcing was noted for Al-Al3Ni containing blade-like whiskers. Author
- Laminates and Composite Materials
- Properties of Metals and Alloys