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Ensinger PEI

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Beryllium, Be
Categories: Metal; Nonferrous Metal; Beryllium Alloy; Pure Element

Material Notes: Beryllium is one of the lightest metals and has a high strength-to-weight ratio, stiffness-to-weight ratio, and very high specific heat, thermal conductivity, and heat of fusion. It has significant ductility, is readily machined and can be rolled, drawn, or extruded. It finds applications in nuclear reactors (neutron moderator and reflector), X-ray sources/detectors (X-ray transparency), IR target acquisition systems, inertial guidance instruments, computer parts, other aircraft and satellite structures, and heat sink constraining cores.

Information provided by Materion Corporation (formerly Brush Wellman) and the references.

Please note that there are health hazards associated with beryllium, especially when present as airborne particles generated during processing. As with any material, be aware of hazards and take steps to reduce exposure to a safe level.

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Physical PropertiesOriginal ValueComments
Density 1.844 g/cc
 
Chemical PropertiesOriginal ValueComments
Atomic Mass 9.0121821995
Atomic Number 4
Thermal Neutron Cross Section 0.0090 barns/atom
X-ray Absorption Edge 110.68 ÅK
Electrode Potential -1.70 V
Electronegativity 1.57Pauling
Ionic Radius 0.350 ÅCrystal Ionic Radius for Valence +2
 0.440 ÅCrystal Ionic Radius for Valence +1
 
Mechanical PropertiesOriginal ValueComments
Hardness, Rockwell B 75 - 85
Tensile Strength, Ultimate 370 MPa
Tensile Strength, Yield 240 MPa
Elongation at Break 3.0 %
Modulus of Elasticity 303 GPa
Compressive Yield Strength 270 MPaYield at 0.2% offset (10% higher than tensile yield strength).
Poissons Ratio 0.070 - 0.18values between 0.07 and 0.18 have been reported for beryllium
Fatigue Strength 160 MPa
@# of Cycles 1.00e+7
Kt=3.07 and R = 0.1
 240 MPa
@# of Cycles 1.00e+7
smooth
 240 MPa
@# of Cycles 10000
Kt=3.07 and R = 0.1
Fracture Toughness 10.6 - 12.3 MPa-m½KIC for hot-pressed structural grades
Shear Modulus 135 GPa
Shear Strength 345 MPahot-pressed block
 480 MPacross-rolled sheet
Charpy Impact 1.50 - 5.50 JNotch status unknown
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.00000430 ohm-cm
Magnetic Susceptibility -1.00e-6cgs/g
Critical Superconducting Temperature 0.0260 K
 
Thermal PropertiesOriginal ValueComments
Heat of Fusion 1133 J/gBe has an unusually high heat of fusion.
Heat of Vaporization 24770 J/g
CTE, linear 11.5 µm/m-°C
@Temperature 25.0 °C
increases rapidly until 100°C
 14.5 µm/m-°C
@Temperature 25.0 - 300 °C
 16.5 µm/m-°C
@Temperature 25.0 - 600 °C
 18.4 µm/m-°C
@Temperature 25.0 - 1000 °C
Specific Heat Capacity 1.925 J/g-°C
Thermal Conductivity 216 W/m-K
Melting Point 1273 - 1283 °C
Boiling Point 2471 °C
 
Optical PropertiesOriginal ValueComments
Emissivity (0-1) 0.61650 nm
Reflection Coefficient, Visible (0-1) 0.5050% visible; 55% UV; 98% IR (10.6 µm)
 
Component Elements PropertiesOriginal ValueComments
Beryllium, Be 100 %
 
Descriptive Properties
CAS Number7440-41-7

References for this datasheet.

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