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→5.2.1 Technical Grade Pure Nickel
===5.2.1 Technical Grade Pure Nickel===
Technical grade pure nickel commonly contains 99.0 to 99.8 wt% Ni and up to 1 wt% Co. Other ingredients are iron and manganese ''[[#figures11|(Figs. 3 – 7)]] (Tables 5.21 and 5.22)''. Work hardening and softening behavior of nickel are shown in Figs. 5.45 and 5.46.
One of the significant properties of nickel is its modulus of elasticity which is almost twice as high as that of copper. At temperatures up to 345°C nickel is ferro-magnetic.
Because of the always present thin oxide layer on its surface, nickel is not suitable as a contact material for switching contacts.
<div id="figures11"><xr id="fig:Strain hardening of technical pure nickel by cold working"/> Fig. 5.45: Strain hardening of technical pure nickel by cold working <xr id="fig:Softening of technical grad nickel after annealing for 3 hrs"/> Fig. 5.46; Softening of technical grad nickel after annealing for 3 hrs after 50% cold working</div> <div class="multiple-images"><figure id="fig:Strain hardening of technical pure nickel by cold working">
[[File:Strain hardening of technical pure nickel by cold working.jpg|right|thumb|Strain hardening of technical pure nickel by cold working]]
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[[File:Softening of technical grad nickel after annealing for 3 hrs.jpg|right|thumb|Softening of technical grad nickel after annealing for 3 hrs after 50% cold working]]
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===5.2.2 Nickel Alloys===
