Gold (Au) soft annealed (+A)

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Description

Gold (Au) is a reddish-yellow, in very thin films blue-green translucent, cubic crystallizing precious metal. It is one of the heaviest metals, is relatively soft and very elastic. Among all metals, it has the best hot and cold ductility and can be hammered down to foil up to 0.0001 mm thick. Gold, which does not oxidize even at higher temperatures, forms alloys with almost all metals. Even small alloy additions can significantly increase the strength and hardness of gold and change its color (white gold: Pt, Pd, Ni / color gold: Cu). The chemical properties of gold characterize the concept of the precious metal par excellence. Thus, at normal temperature, Au is not attacked by dry and moist air, water, oxygen, fluorine, iodine, sulfur, as well as the vast majority of acids, aqueous salt solutions and alkalis, regardless of the concentration. In the electrical industry (just under 10% of gold consumption), the material gold is used for switching contacts (dry circuits with the smallest currents and voltages), plug contacts, transistor and IC carriers, ultrafine wires for semiconductors and anodes. It is very ductile, corrosion-resistant, oxidation-resistant, has a tendency to cold sweat. Au is machineless and machinable, roll-galvanized galvanic and can be separated from the gas phase.

Related Standards

This material data has been provided by WIAM.

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.

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Properties

General

PropertyTemperatureValue

Density

20.0 °C

19.3 g/cm³

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Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

78 GPa

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Elongation

20.0 °C

40 %

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Hardness, Vickers

20.0 °C

20 - 40 [-]

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Poisson's ratio

20.0 °C

0.42 [-]

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Shear modulus

20.0 °C

28 GPa

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Tensile strength

20.0 °C

180 MPa

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Yield strength

20.0 °C

50 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.39E-5 1/K

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200.0 °C

1.48E-5 1/K

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300.0 °C

1.52E-5 1/K

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400.0 °C

1.53E-5 1/K

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500.0 °C

1.55E-5 1/K

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600.0 °C

1.57E-5 1/K

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700.0 °C

1.59E-5 1/K

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800.0 °C

1.62E-5 1/K

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Melting point

1064 °C

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Typical for Gold

Specific heat capacity

23.0 °C

126 - 138 J/(kg·K)

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Typical for Gold

Thermal conductivity

-233.0 °C

420 W/(m·K)

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-173.0 °C

360 W/(m·K)

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-73.0 °C

326 W/(m·K)

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20.0 °C

312 W/(m·K)

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127.0 °C

309 W/(m·K)

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327.0 °C

296 W/(m·K)

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527.0 °C

284 W/(m·K)

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727.0 °C

271 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical conductivity

20.0 °C

4.30E+7 S/m

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Electrical resistivity

20.0 °C

2.3E-8 - 2.9E-8 Ω·m

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Chemical properties

PropertyValue

Gold

99.99 %

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