Precipitation Characteristics of Rocky Flats Beryllium Ingot Sheet.

Fraikor, F.J.; Grotzky, V.K.; Brewer, A.W.; Reed, H. E.

doi:10.2172/4030851

Cited by 2 publications

(2 citation statements)

References 6 publications

(8 reference statements)

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“…This represents a reduction in melting temperature compared to the three binaries: Al-Si at 577 ЊC, Be-Al at 644 ЊC, and Be-Si at 1090 ЊC. The presence of AlFeBe 4 in the fusion zone is intriguing, given that tens of hours below the solvus temperature, approximately 850 ЊC, [14,[20][21][22] are generally required to generate discrete particles. This phase most likely forms in the grain boundaries of the weld centerline as part of a quaternary solidification reaction, not through solid-state diffusion, as is believed to occur during heat treatment.…”

Section: Discussionmentioning

confidence: 99%

Microstructural features of cracking in autogenous beryllium weldments

Cotton

Field

1997

Metall Mater Trans A

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An investigation was conducted to determine the causes of centerline cracking in autogenous Be weldments. In agreement with earlier studies, features on the fracture surfaces consistent with hot shortness cracking were observed. However, the present study reveals a more complicated solidification path than previously described. Analytical transmission electron microscopy (TEM) studies of the weld centerline revealed low-melting constituents consisting of a MBe 12 grain boundary film and nodules containing elemental Al, elemental Si, and AlFeBe 4 phases. Possible solidification pathways to produce this structure are discussed in terms of available binary and ternary phase diagrams.

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Section: Discussionmentioning

confidence: 99%

Microstructural features of cracking in autogenous beryllium weldments

Cotton

Field

1997

Metall Mater Trans A

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“…The purpose of this soaking period is to put the iron impurities into solid solution, Then, during subsequent rolling at lower temperatures, the iron precipitates, principally as the ternary phase AlFeBe4 . 2 This ties up the aluminum and prevents hot shortness in subsequent metal working operations. Undoubtedly, the 1900°F soak causes the aluminum and silicon impurities to be present as liquid grain boundary phases when rolling commences.…”

Section: Rolling Temperaturementioning

confidence: 99%