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→5.2.2 Nickel Alloys
Because of its low electrical conductivity NiCu30Fe is besides pure Ni and CuNi alloys the most widely used backing material for weldable contact components. With 1 – 2 wt% additives of Fe as well as 0.5 – 1 wt% Mn and Co the mechanical strength of the binary alloy NiCu30 can be increased.
The strength values of NiCu30Fe are significantly higher than those of the copper rich CuNi alloys ''[[#figures12|(Figs. 3 – 7)]] (Figs. 5.47 and 5.48)''. The good spring properties and thermal stability of NiCu30Fe make it a suitable material for the use as thermally stressed contact springs.
<div id="figures12"><xr id="fig:Strain hardening of NiCu30Fe by cold working"/> Fig. 5.47: Strain hardening of NiCu30Fe by cold working <xr id="fig:Softening of NiCu30Fe after annealing for 0.5 hrs"/> Fig. 5.48: Softening of NiCu30Fe after annealing for 0.5 hrs and after 80% cold working</div> <div class="multiple-images"><figure id="fig:Strain hardening of NiCu30Fe by cold working">
[[File:Strain hardening of NiCu30Fe by cold working.jpg|right|thumb|Strain hardening of NiCu30Fe by cold working]]
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[[File:Softening of NiCu30Fe after annealing for 0.5 hrs.jpg|right|thumb|Softening of NiCu30Fe after annealing for 0.5 hrs and after 80% cold working]]
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'''Table 5.21: Physical Properties of Nickel and Nickel Alloys''' (2 Teile!)
