A.2.2. Beryllium-Copper (CDA 170)

PRODUCT

Type

Metal Alloy

Chemical Composition

1.8% Be, 0.3% Co + Ni, Rem. Cu

Manufacturer

NGK BERYLCO UK Ltd.

UNIT "E" Houston Park,

Montford street, Salford M5 2RP

UK

Tel: +44 (0)161 745 7162

Fax: +44 (0)161 745 7520

Email: enquiries@ngkberylco.co.uk

www.ngkberylco.co.uk/europe.htm

EXPERIENCE & AVAILABILITY

Development Status

Commercial Product

Cost Range

Low

Lot Reproducibility

ASTM B194, BS 2870, BS 2873, CB101

Space Experience

Good

GENERAL PROPERTIES (Physical, Mechanical, Thermal, Electrical, Optical)

Nature

Typical Value

Remarks

Specific Gravity

8.25

@ Room Temperature

Ultimate Tensile Strength

460 to 1500 MPa

@ Room Temperature

Proof Stress (0.2%)

125 to 1100 MPa

@ Room Temperature

Elongation at Break

2 to 50%

@ Room Temperature

Thermal Conductivity

84 to 150 W m -1 C -1

@ Room Temperature

Thermal Expansion Coefficient

17 x 10-6 C -1

@ Room Temperature

PROPERTIES RELEVANT TO SPACE USE

Nature

Typical Value

Type of Test

Corrosion

Generally good.

 

Stress Corrosion

High resistance only when solution treated/work hardened, then precipitation hardened.

 

SPECIAL RECOMMENDATIONS

          The alloy is age-hardeneable and the heat treatment is as follows:

- solution treat 760 - 820C Water Quench

- age 315 - 350C Air Cool

          Solution treatment may be from 10 to 30 minutes for light materials (i.e. wire or strip), extending up to several hours for bulky castings. Precipitation hardening normally requires 2 hours at 310C or 30 minutes at 350C.

          Fabrication methods involving either welding, brazing or high temperature soldering should be performed whilst the alloy is in the soft condition and then followed by the solution and ageing treatments.