Effects of processing conditions and test temperature on fatigue crack growth and fracture toughness of Be–Al metal matrix composites

Lewandowski, John J.; Larose, Joël

doi:10.1016/s0921-5093(02)00391-x

Cited by 13 publications

(2 citation statements)

References 14 publications

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“…This is consistent with other work on Be-Al composites, [29] where significant increases in Paris law slope at low test temperatures were accompanied by an increase in the amount of brittle fracture of the Be on the fracture surface. [29] Similar observations of increased Paris slope with decreases in test temperature have been documented in Nb silicide-Nb composites, [30] where there was an increase in the amount of static modes of fracture (i.e., cleavage of Nb phase) accompanying fatigue at low temperature. As with the 6061-T6 tests, the fatigue behavior after one thermal cycle to 148 K produced fatigue behavior essentially identical to the original room-temperature tests.…”

Section: A General Observationssupporting

confidence: 92%

Effects of changes in test temperature on fatigue crack propagation of Al6090/SiCp-Al 6013 laminated metal composites

Hassan

Lewandowski

El-Latif

2004

Metall Mater Trans A

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The effects of changes in test temperature from 298 to 148 K on the fatigue crack propagation of 6090/SiC/20p-6013 and 6090/SiC/25p-6013 laminated metal composites (LMCs) tested in the crack arrester orientation were investigated. The fatigue crack propagation behavior of similar monolithic and discontinuously reinforced aluminum (DRA) materials was additionally compared to that of the laminates. The fatigue behavior of the laminates was significantly different from that of the monolithic and DRA and was affected by changes in the test temperature as well as by a thermal cycle to low temperatures (e.g., 77 or 148 K) prior to testing at either 213 or 298 K. Fatigue tests conducted either at low temperature or after a low-temperature thermal cycle exhibited significant changes in crack velocity upon traversing the individual laminae. Crack growth in these samples was accompanied by crack bifurcation and interfacial separation at high ⌬K. Attempts at modeling the effects of thermally-induced residual stresses on fatigue using a weight function approach provided reasonable estimates of the residual-stress-induced shielding in the different layers.

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Section: A General Observationssupporting

confidence: 92%

Effects of changes in test temperature on fatigue crack propagation of Al6090/SiCp-Al 6013 laminated metal composites

Hassan

Lewandowski

El-Latif

2004

Metall Mater Trans A

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“…Be-Al alloys produced by precision casting has a smaller grain size and defects such as cracks, porosity, holes, segregation and inclusions are easily avoided. As a result, Be-Al alloys (AlBeMet® AM162 [8] and 62Be/6061Al [9] produced by powder metallurgy have better mechanical properties and those produced by precision casting. The same basic equipment for Al investment casting is used in the casting process of Be-Al alloy, and the only unique features of the Be-Al Cast process are the need for particulate collecting equipment and the use of vacuum casting versus the more traditional…”

Section: Tablementioning

confidence: 99%