Physical Metallurgy of Beryllium

Goldberg, A.; Olson, D. L.; Jacobson, L. A.

doi:10.31399/asm.tb.bcp.t52230151

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…Typical 𝜎𝜎 𝑏𝑏 = 1.4 Kg / mm 2 ). However, at moderately high temperature, prismatic slip system is activated and result in deformation and fracture of metal while pyramidal only become active at very high temperatures [5]. This is very quick, and metal fails in brittle manner.…”

Section: Brittleness Crystallography Deformation and Fracture Of Bery...mentioning

confidence: 99%

Fracture of Be and its Alloys - Webb Space Telescope Revisited

Rafique¹

2023

Preprint

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NASA/ESA/CSA joint venture James Webb Space Telescope is about to be launched. It is hypothesized to operate in near-infrared range. It is also hypothesized to unveil early star formation, galaxies, and universe due to its orbit, point in orbit and orbital motion. It has been under manufacturing for over 20 years at a staggering cost of 10 billion US dollars (most expensive scientific experiment in history). Beryllium (Be) is chosen to be element for construction of its main mirrors due to its high stiffness, low density, low linear coefficient of thermal expansion (α) in cryogenics and high thermal conductivity. It is followed by gold (Au) layer deposition on its (Be) surface to enhance its sensitivity towards infrared radiation as later is hypothesized to bear superior properties. However, serious mistakes have been made in selecting this material for this application. Owing to its crystal structure (hexagonal close packed (hcp)), slip planes (basal, prismatic and pyramidal) and mechanisms of their activation, Be necessitates easy fracture at cryogenic temperature. It has anisotropic properties and prone to transverse fracture under tensile loading. Furthermore, its ductile to brittle transition temperature is very low making it entirely unsuitable for such an application. It is one of most expensive metals on planet. This study constitutes revisiting these fundamental properties and mechanisms which were entirely ignored during materials selection thus rendering whole project useless.

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Section: Brittleness Crystallography Deformation and Fracture Of Bery...mentioning

confidence: 99%

Fracture of Be and its Alloys - Webb Space Telescope Revisited

Rafique¹

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Typical 𝜎 𝑏 = 1.4 Kg / mm 2 ). However, at moderately high temperature, prismatic slip system is activated and result in deformation and fracture of metal while pyramidal only become active at very high temperatures [5]. This is very quick, and metal fails in brittle manner.…”

Section: Fig -1: Crystallographic Planes and Directions In A Hcp Lattice [1]mentioning

confidence: 99%

Fracture of Be and Its Alloys - Webb Space Telescope Revisited

Rafique¹

2021

Preprint

View full text Add to dashboard Cite

show abstract

Physical Metallurgy of Beryllium

Cited by 2 publications

References 18 publications

Fracture of Be and its Alloys - Webb Space Telescope Revisited

Fracture of Be and its Alloys - Webb Space Telescope Revisited

Fracture of Be and Its Alloys - Webb Space Telescope Revisited

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