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Long-term thermal degradation and alloying constituent effects on five boron/aluminum composites
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Olsen, G. C. |
| Copyright Year | 1982 |
| Description | Thermal exposure effects on the properties of five boron/aluminum composite systems were experimentally investigated. The composite systems were 49 volume percent boron fibers (203 micron diameter) in aluminum-alloy matrices 1100 Al, 2024 Al, 3003 Al, 5052 Al, and 6061 Al. Specimens were thermally exposed up to 10,000 hours at 500 K and 590 K, up to 500 hours at 730 K, and up to 10,000 hours at 500 K and 590 K, up to 500 hours at 730 K, and up to 2000 thermal cycles between 200 K and 590 K. Composite longitudinal and transverse tensile strengths, longitudinal compression strength, and in-plane shear strength were determined. None of the systems was severely degraded by exposure at 590 K. The best performing system was B-2024 Al. Effects of matrix alloys on degradation mechanisms were experimentally investigated. Composite specimens and individual fibers were metallurgically analyzed with a scanning electron microscope and an electron microprobe to determine failure characteristics, chemical element distribution, and reaction layer morphology. Alloying constituents were found to be affect the composite degradation mechanisms as follows: alloys containing iron, but without manganese as a stabilizer, caused increased low-temperature degradation; alloys containing magnesium, iron, or manganese caused increased degradation; and alloys containing copper caused increased fiber strength. |
| File Size | 6459316 |
| Page Count | 108 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820014443 |
| Archival Resource Key | ark:/13960/t1vf1ns4s |
| Language | English |
| Publisher Date | 1982-04-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Boron Fibers Shear Properties Thermal Cycling Tests Aluminum Alloys Chemical Reactions Thermal Fatigue Iron Tensile Strength Thermal Stability Aluminum Boron Composites Metal Matrix Composites Alloying Boron Reinforced Materials Copper Thermal Degradation Manganese Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
