Hafnium

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Description

Hafnium's physical and chemical properties closely resemble those of zirconium, which is the reason why it was discovered very late in history compared to the other elements. The combination of these properties render hafnium useless for many applications common to other metals. However, one characteristic stands out from most other elements, which is hafnium's unrivalled ability to absorb neutrons. This property makes hafnium one of the best choices for the construction of control bars to be used in nuclear reactors in order to keep them in safe operation.

Ashby charts

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Properties

General

Density

13.1 g/cm³ at 20 °C

Mechanical

Elastic modulus

141 GPa at 20 °C

Hardness, Brinell

1700 [-] at 20 °C

Poisson's ratio

0.26 [-] at 20 °C

Tensile strength

R_m

745 MPa at 20 °C

Thermal

Melting point

T_m

2227 °C

Specific heat capacity

c_p

146 J/(kg·K) at 20 °C

Thermal conductivity

23 W/(m·K) at 20 °C

Electrical

Electrical resistivity

ρ_el

3.2E-7 Ω·m at 20 °C

This material data has been provided by Matmatch.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.