Literature Survey: Physical Properties of Lithium and Beryllium at Low Temperatures.

Lott, L. A.

doi:10.2172/4574618

Cited by 2 publications

(4 citation statements)

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“…It can be easily inferred all materials tested at 0.001 / s strain rate failed from tensile hoop stresses and cracked along the compression specimen surface. DBTT range is from 400 to 100 o C. Strongest material exhibits highest DBTT [2,12,13]. In case of figure 4 (strain rate 1 / s), lower limit of DBBT is raised to 200 with same upper limit of 400C.…”

Section: Fig -2: Temperature Dependence Of Mechanical Properties For ...mentioning

confidence: 96%

“…Beryllium is a hexagonal close packed (hcp) crystal structure metal. It is brittle at room temperature [1] and its brittleness increases as temperature is lowered [2]. It has three main slip systems (0001), {11 ̅ 00} and {11 ̅ 0𝑋𝑋} namely basal, prismatic, and pyramidal and there is only one slip direction <112 ̅ 0> [3,4] (Fig - 1).…”

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

confidence: 99%

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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: Fig -2: Temperature Dependence Of Mechanical Properties For ...mentioning

confidence: 96%

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

Section: Fig -2mentioning

confidence: 96%

“…Beryllium is a hexagonal close packed (hcp) crystal structure metal. It is brittle at room temperature [1] and its brittleness increases as temperature is lowered [2]. It has three main slip systems (0001), {11 ̅ 00} and {11 ̅ 0𝑋} namely basal, prismatic, and pyramidal and there is only one slip direction <112 ̅ 0> [3,4] (Fig - 1).…”

Section: Brittleness Crystallography Deformation and Fracture Of Berylliummentioning

confidence: 99%

Fracture of Be and Its Alloys - Webb Space Telescope Revisited

Rafique¹

2021

Preprint

View full text Add to dashboard Cite

show abstract

Literature Survey: Physical Properties of Lithium and Beryllium at Low Temperatures.

Cited by 2 publications

References 1 publication

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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