Hafnium, Hf; Rod

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Hafnium, Hf; Rod
Categories:	Metal; Nonferrous Metal; Pure Element
Material Notes:	Tensile and/or hardness values are for rod; other property values are typical of the element. Three entries for pure Hf are in MatWeb. Characteristics: Contains approximately 250 ppm Dioxide which improves ductility High Neutron absorption Forms a stable, dense, self-healing oxide layer High corrosion resistance Allotropic transformation at 1760°C Applications: Superalloys Alloying with Aluminium, Copper, Magnesium or Titanium Nuclear systems - control rods
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Physical Properties	Original Value	Comments

Density	13.31 g/cc

Chemical Properties	Original Value	Comments
Atomic Mass	178.49	1995
Atomic Number	72
X-ray Absorption Edge	0.18981 Å	K
	1.09864 Å	L_I
	1.15311 Å	L_II
	1.2957 Å	L_III
Electronegativity	1.3	Pauling
Ionic Radius	0.780 Å	Crystal Ionic Radius for Valence +4

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	485 MPa
	310 MPa @Temperature 315 °C	Longitudinal
Tensile Strength, Yield	125 MPa @Strain 0.02 %, Temperature 315 °C	Longitudinal
	240 MPa @Strain 0.02 %, Temperature 23.0 °C	Longitudinal
Elongation at Break	25 %

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000355 ohm-cm
Magnetic Susceptibility	4.2e-7	cgs/g
Critical Magnetic Field Strength, Oersted	12.7
Critical Superconducting Temperature	0.128 K

Thermal Properties	Original Value	Comments
CTE, linear	5.90 µm/m-°C @Temperature 20.0 °C
Specific Heat Capacity	0.144 J/g-°C
Thermal Conductivity	22.0 W/m-K
Melting Point	2207 - 2247 °C
Boiling Point	3100 °C

Component Elements Properties	Original Value	Comments
Hafnium, Hf	100 %

Descriptive Properties
Alpha phase Crystal Structure	hcp	< 1760°C
Atomic weight	178.5
Beta Phase Crystal Structure	bcc	> 1760°C
CAS Number	7440-58-6

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to go back to viewing the property data in MatWeb's normal format.

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