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→Hard-Silver Alloys
Dispersion hardened alloys of silver with 0.5 wt% MgO and NiO (ARGODUR 32) are produced by internal oxidation. While the melt-metallurgical alloy is easy to cold-work and form the material becomes very hard and brittle after dispersion hardening. Compared to fine silver and hard-silver this material has a greatly improved temperature stability and can be exposed to brazing temperatures up to 800°C without decreasing its hardness and tensile strength.
Because of these mechanical properties and its high electrical conductivity??? ARGODUR 32 is mainly used in the form of contact springs that are exposed to high thermal and mechanical stresses in relays, and contactors for aeronautic applications.
Table 2.13: Physical Properties of Silver and Silver Alloys
Fig. 2.52: Phase diagram of silver-copper
Table 2.14: Mechanical Properties of Silver and Silver Alloys
Fig. 2.54:Strain hardeningof AgCu3by cold working
Fig. 2.55:Softening of AgCu3after annealing for 1 hrafter 80% cold working
Fig. 2.56:Strain hardening of AgCu5 by coldworking
Fig. 2.57:Softening of AgCu5 afterannealing for 1 hr after 80% coldworking
Fig. 2.58:Strain hardening of AgCu 10by cold working
Fig. 2.59:Softening of AgCu10 afterannealing for 1 hr after 80% coldworking
Fig. 2.60:Strain hardening of AgCu28 bycold working
Fig. 2.61:Softening of AgCu28after annealing for 1 hr after80% cold working
Fig. 2.62:Strain hardening of AgNi0.15by cold working
Fig. 2.63:Softening of AgNi0.15after annealing for 1 hr after 80%cold working
Fig. 2.64:Strain hardening ofARGODUR 27by cold working
Fig. 2.65:Softeningof ARGODUR 27 after annealingfor 1 hr after 80% cold working
Table 2.15: Contact and Switching Properties of Silver and Silver Alloys
