Zirconium, Zr

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Zirconium, Zr
Categories:	Metal; Nonferrous Metal; Zirconium Alloy; Pure Element
Material Notes:	This entry is for pure Zr; MatWeb also has data sheets for many Zr alloys. Characteristics: Ductile Mechanical Properties similar to titanium and austenitic stainless steel Excellent corrosion resistance Transparent to thermal energy neutrons. Forms adherent, refractory double-oxide layer above 650°C Highly anisotropic, undergoes allotropic transormation from hcp-structured alpha phase to bcc-structured beta phase at 870°C Applications: Superalloys Alloying with Aluminium, Copper, Magnesium or Titanium Water-cooled Nuclear reactors Chemical processing equipment
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Physical Properties	Original Value	Comments

Density	6.53 g/cc
Vapor Pressure	1.013e-10 bar @Temperature 1574 °C
	1.013e-9 bar @Temperature 1690 °C
	1.013e-8 bar @Temperature 1822 °C
	1.013e-7 bar @Temperature 1976 °C
	0.000001013 bar @Temperature 2156 °C
	0.00001013 bar @Temperature 2367 °C
	0.0001013 bar @Temperature 2620 °C
	0.001013 bar @Temperature 2926 °C
	0.01013 bar @Temperature 3304 °C
	0.1013 bar @Temperature 3783 °C
	1.013 bar @Temperature 4409 °C

Chemical Properties	Original Value	Comments
Atomic Mass	91.224	1995
Atomic Number	40
Thermal Neutron Cross Section	0.18 barns/atom
X-ray Absorption Edge	0.68877 Å	K
	4.8938 Å	L_I
	5.37088 Å	L_II
	5.57374 Å	L_III
Electronegativity	1.33	Pauling
Ionic Radius	0.790 Å	Crystal Ionic Radius for Valence +4
	1.09 Å	Crystal Ionic Radius for Valence +1
Electrochemical Equivalent	0.844 g/A/h

Mechanical Properties	Original Value	Comments
Hardness, Brinell	145	Converted from Vickers for 3000 kg load/10 mm ball. Annealed sample
Hardness, Rockwell A	49	Converted from Vickers. annealed sample
Hardness, Rockwell B	78	Converted from Vickers. Annealed sample
Hardness, Vickers	150	annealed sample
Tensile Strength, Ultimate	330 MPa	Annealed
Tensile Strength, Yield	230 MPa	Annealed
Elongation at Break	32 %	Annealed
Modulus of Elasticity	94.5 GPa
Poissons Ratio	0.34
Shear Modulus	35.3 GPa	Calculated

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000400 ohm-cm
Magnetic Susceptibility	0.00000134	cgs/g
Critical Magnetic Field Strength, Oersted	47
Critical Superconducting Temperature	0.610 K	±0.15; 0.65, 0.95 K for omega Zr.

Thermal Properties	Original Value	Comments
Heat of Fusion	251 J/g
CTE, linear	5.80 µm/m-°C @Temperature 20.0 - 100 °C
	6.30 µm/m-°C @Temperature 250 °C
	6.90 µm/m-°C @Temperature 500 °C
Specific Heat Capacity	0.285 J/g-°C
Thermal Conductivity	16.7 W/m-K
Melting Point	1852 °C
Boiling Point	4377 °C

Optical Properties	Original Value	Comments
Emissivity (0-1)	0.32	650 nm; unoxidized; total

Processing Properties	Original Value	Comments
Annealing Temperature	>= 705 °C	cold-rolled, in vacuum
	>= 760 °C	hot-rolled
	>= 1000 °C	solution annealing for forged billets

Component Elements Properties	Original Value	Comments
Zirconium, Zr	100 %

Descriptive Properties
Alpha Phase Crystal Structure	hcp	< 870°C
Beta Phase Crystal Structure	bcc	> 870°C
CAS Number	7440-67-7

References for this datasheet.

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