Accession Number:

AD0753689

Title:

Fatigue Behavior in Torsion of an Unidirectionally Solidified Eutectic,

Descriptive Note:

Corporate Author:

CONNECTICUT UNIV STORRS DEPT OF METALLURGY

Personal Author(s):

• Ovens,W. G. , Jr.
• McEvily,A. J. , Jr

Report Date:

1972-10-01

Pagination or Media Count:

28.0

Abstract:

The fatigue behavior of the directionally-solidified eutectic-alloy Al-Al3Ni was studied under cyclic-torsional loading. The fatigue process is largely confined to the matrix, with the rod-like reinforcing phase influencing the crack path. Grain boundaries are foung to be preferred sites for cracking. An observed cyclic softening process is related to the initial distribution of dislocations along the fibers. A surface wrinkling effect is the result of a second-order effect in cyclic torsion. Fatigue properties of the composite are better than might be expected on the basis of axial tests. Author

Descriptors:

• (*FIBER METALLURGY
• *COMPOSITE MATERIALS)
• (*EUTECTICS
• FIBER METALLURGY)
• ALUMINUM ALLOYS
• NICKEL ALLOYS
• FATIGUE(MECHANICS)
• GRAIN BOUNDARIES
• CRACK PROPAGATION

Subject Categories:

• Laminates and Composite Materials
• Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE