| Beryllium, Be | |
|---|---|
| Categories: | MetalNonferrous MetalBeryllium AlloyPure 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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Export data to your CAD/FEA program| Physical Properties | Metric | English | Comments | ||
|---|---|---|---|---|---|
| Density | 1.844 g/cc | 0.06662 lb/in³ | |||
| Chemical Properties | Metric | English | Comments | ||
| Atomic Mass | 9.012182 | 9.012182 | 1995 | ||
| Atomic Number | 4 | 4 | |||
| Thermal Neutron Cross Section | 0.0090 barns/atom | 0.0090 barns/atom | |||
| X-ray Absorption Edge | 110.68 Å | 110.68 Å | K | ||
| Electrode Potential | -1.70 V | -1.70 V | |||
| Electronegativity | 1.57 | 1.57 | Pauling | ||
| Ionic Radius | 0.350 Å | 0.350 Å | Crystal Ionic Radius for Valence +2 | ||
| 0.440 Å | 0.440 Å | Crystal Ionic Radius for Valence +1 | |||
| Mechanical Properties | Metric | English | Comments | ||
| Hardness, Rockwell B | 75 – 85 | 75 – 85 | |||
| Tensile Strength, Ultimate | 370 MPa | 53700 psi | |||
| Tensile Strength, Yield | 240 MPa | 34800 psi | |||
| Elongation at Break | 3.0 % | 3.0 % | |||
| Modulus of Elasticity | 303 GPa | 43900 ksi | |||
| Compressive Yield Strength | 270 MPa | 39200 psi | Yield at 0.2% offset (10% higher than tensile yield strength). | ||
| Poissons Ratio | 0.070 – 0.18 | 0.070 – 0.18 | values between 0.07 and 0.18 have been reported for beryllium | ||
Fatigue Strength  | 160 MPa @# of Cycles 1.00e+7 | 23200 psi @# of Cycles 1.00e+7 | Kt=3.07 and R = 0.1 | ||
| 240 MPa @# of Cycles 1.00e+7 | 34800 psi @# of Cycles 1.00e+7 | smooth | |||
| 240 MPa @# of Cycles 10000 | 34800 psi @# of Cycles 10000 | Kt=3.07 and R = 0.1 | |||
| Fracture Toughness | 10.6 – 12.3 MPa-m½ | 9.65 – 11.2 ksi-in½ | KIC for hot-pressed structural grades | ||
| Shear Modulus | 135 GPa | 19600 ksi | |||
| Shear Strength | 345 MPa | 50000 psi | hot-pressed block | ||
| 480 MPa | 69600 psi | cross-rolled sheet | |||
| Charpy Impact | 1.50 – 5.50 J | 1.11 – 4.06 ft-lb | Notch status unknown | ||
| Electrical Properties | Metric | English | Comments | ||
| Electrical Resistivity | 0.00000430 ohm-cm | 0.00000430 ohm-cm | |||
| Magnetic Susceptibility | -1.00e-6 | -1.00e-6 | cgs/g | ||
| Critical Superconducting Temperature | 0.0260 K | 0.0260 K | |||
| Thermal Properties | Metric | English | Comments | ||
| Heat of Fusion | 1133 J/g | 487.4 BTU/lb | Be has an unusually high heat of fusion. | ||
| Heat of Vaporization | 24770 J/g | 10660 BTU/lb | |||
| CTE, linear | 11.5 µm/m-°C @Temperature 25.0 °C | 6.39 µin/in-°F @Temperature 77.0 °F | increases rapidly until 100°C | ||
| 14.5 µm/m-°C @Temperature 25.0 – 300 °C | 8.06 µin/in-°F @Temperature 77.0 – 572 °F | ||||
| 16.5 µm/m-°C @Temperature 25.0 – 600 °C | 9.17 µin/in-°F @Temperature 77.0 – 1110 °F | ||||
| 18.4 µm/m-°C @Temperature 25.0 – 1000 °C | 10.2 µin/in-°F @Temperature 77.0 – 1830 °F | ||||
| Specific Heat Capacity | 1.925 J/g-°C | 0.4601 BTU/lb-°F | |||
| Thermal Conductivity | 216 W/m-K | 1500 BTU-in/hr-ft²-°F | |||
| Melting Point | 1273 – 1283 °C | 2323 – 2341 °F | |||
| Boiling Point | 2471 °C | 4480 °F | |||
| Optical Properties | Metric | English | Comments | ||
| Emissivity (0-1) | 0.61 | 0.61 | 650 nm | ||
| Reflection Coefficient, Visible (0-1) | 0.50 | 0.50 | 50% visible; 55% UV; 98% IR (10.6 µm) | ||
| Component Elements Properties | Metric | English | Comments | ||
| Beryllium, Be | 100 % | 100 % | |||
| Descriptive Properties | |||||
| CAS Number | 7440-41-7 | ||||
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