=====<!--5.1.5.1 -->Copper-Nickel Alloys=====
Copper and nickel are in their solid and liquid phase completely soluble in each other ''(<xr id="fig:Phase_diagram_of_copper-nickel_for_the_range_of_0-50_wt_nickel"/><!--(Fig. 5.21)''-->). Because of their very low electrical conductivity , they are mainly used as resistance alloys ''(<xr id="fig:Electrical_conductivity_of_copper-nickel_alloys_as_a_function_of_nickel_content"/><!--(Fig. 5.22)''-->). The work hardening and softening behavior of CuNi alloys and CuNi9Sn2 are shown in [[#figures6|(Figs. 3 – 7)]]<!--(Figs. 5.23 – 5.27)-->. Coppernickel alloys exhibit high corrosion resistance, good weldabilty, and the suitability for cladding to other materials. Because of these and their other properties (Tables <xr id="tab:Physical_ Properties_of_Selected_Copper_Nickel_Alloys"/><!--(Tab. 5.15 )--> and <xr id="tab:Mechanical_Properties_of_Selected_Copper_Nickel_Alloys"/><!--(Tab. 5.16)-->) they are, with and without additives of iron or manganese, widely used as good weldable backing layers on weld buttons and weld profiles (weld tapes).
=====<!--5.1.5.2 -->Copper-Nickel-Tin Alloys=====
Copper-Nickel- multi component alloys with 9 wt% Ni and 2 wt% Sn are used mainly as connector materials because of their suitable mechanical properties, their excellent relaxation behavior, and their high corrosion resistance. Other advantages include their high temperature stability and the good solderability , even after longer storage. They are also used as base materials for clad profiles and tapes.
Fig. 5.21: Phase diagram of copper<div class="multiple-nickelfor the range of 0 – 50 wt% nickelimages">
Fig. 5.22<figure id="fig: Electrical conductivityPhase_diagram_of_copper-nickel_for_the_range_of_0-50_wt_nickel">[[File:Phase diagram of copper nickel.jpg|left|thumb|<caption>Phase diagram of copper-nickel alloys as a functionfor the range of 0 – 50 wt% nickel content</caption>]]</figure>
Table 5<figure id="fig:Electrical_conductivity_of_copper-nickel_alloys_as_a_function_of_nickel_content">[[File:Electrical conductivity of copper nickel alloys.15: Physical Properties jpg|left|thumb|<caption>Electrical conductivity of Selected Coppercopper-Nickel Alloys (2 Teile!)nickel alloys as a function of nickel content</caption>]]</figure></div><div class="clear"></div>
Table 5.16: Mechanical Properties of Selected Copper-Nickel Alloys (2 Teile!)
Fig. <figtable id="tab:Physical_ Properties_of_Selected_Copper_Nickel_Alloys"><caption>'''<!--Table 5.2315:Strain hardening-->Physical Properties of copperSelected Copper-nickel alloysas a function of nickel contentNickel Alloys'''</caption>
Fig{| class="twocolortable" style="text-align: left; font-size: 12px"|-!Material<br />Designation<br />EN UNS !Composition<br />[wt%]!Density<br />[g/cm<sup>3</sup>]!colspan="2" style="text-align:center"|Electrical<br />Conductivity !Electrical<br />Resistivity<br />[μΩ·cm]!Thermal<br />Conductivity<br />[W/(m·K)]!Coeff. of Linear<br />Thermal<br />Expansion<br />[10<sup>-6</sup>/K]!Modulus of<br />Elasticity<br />[GPa]!Softening Temperature<br />(approx. 10% loss in<br />strength)<br />[°C]!Melting<br />Temp Range<br />[°C]|-!!!![MS/m] ![% IACS]!!!!!!|-|CuNi25<br />CW350H<br />C71300|Ni 24 - 26<br />Mn 0. 5<br />Zn 0.24:5<br />Fe 0.3<br />Cu Rest|8.94|3.0|5.2|33.3|29|15.5|147|ca. 500|1150 - 1210|-|CuNi9Sn2<br />CW351H<br />C72500|Ni 8.5 - 10.5<br />Sn 1.8 - 2.8<br />Mn 0.3<br />Fe 0.3<br />Cu Rest|8.89|6.4|11|15.6|50|16.5|140|ca. 480|1060 - 1120|-|CuNi10Fe1Mn<br />CW352H<br />C70600|Ni 9.0 - 11.0<br />Fe 1.0 - 2.0<br />Mn 0.5 - 1.0<br />Zn 0.5<br />Cu Rest|8.92|5.6|9|17.9|50|16.5|134|||-|CuNi30Mn1Fe<br />CW354H<br />C71500|Ni 30 - 32<br />Mn 0.5 - 1.5<br />Fe 0.4 - 1.0<br />Zn 0.5<br />Cu Rest|8.93|2.6|4|38.5|29|15.5|152||1180 - 1240Strain hardening|}of CuNi25 by cold working</figtable>
Fig. 5.25:Softening of CuNi25 after 1 hrannealing after 50% cold working
Fig. <figtable id="tab:Mechanical_Properties_of_Selected_Copper_Nickel_Alloys"><caption>'''<!--Table 5.2616:Strain hardening-->Mechanical Properties of CuNi9Sn2by cold working(Wieland)Selected Copper-Nickel Alloys'''</caption>
Fig{| class="twocolortable" style="text-align: left; font-size: 12px"|-!Material!Hardness<br />Condition!Tensile Strength R<sub>m</sub><br />[MPa]!0,2% Yield Strength<br />R<sub>p02</sub><br />[MPa]!Elongation<br />A<sub>50</sub><br />[%]!Vickers<br />Hardness<br />HV!Bend Radius<sup>1)</sup><br />perpendicular to<br />rolling direction!Bend Radius<sup>1)</sup><br />parallel to<br />rolling direction!Spring Bending<br />Limit σ<sub>FB</sub><br />[MPa]!Spring Fatigue<br />Limit σ<sub>BW</sub><br />[MPa]|-|CuNi25|R 290|≥ 290|100|30|70 - 100|||||-|CuNi9Sn2|R 340<br />R 380<br />R 450<br />R 500<br />R 560|340 - 410<br />380 - 470<br />450 - 530<br />500 - 580<br />560 - 650|≤ 250<br />≥ 200<br />≥ 370<br />≥ 450<br />≥ 520|20<br />8<br />4<br />2|75 - 110<br />100 - 150<br />140 - 170<br />160 - 190<br />180 - 210|0 x t<br />0 x t<br />0 x t<br />1 x t|0 x t<br />0 x t<br />0 x t<br />2 x t|520|250|-|CuNi10Fe1Mn|R 300<br />R 320|≥ 300<br />≥ 320|≤ 100<br />≤ 200|20|70 - 120<br />≥ 100|||||-|CuNi30Mn1Fe|R 350<br />R 410|350 - 420<br />≥ 410|≤ 120<br />≤ 300|35|80 - 120<br />≥ 110|||||}</figtable><sup>1)</sup> t: Strip thickness max. 0. 5mm <div id="figures6" class="multiple-images"> <figure id="fig:Strain hardening of copper-nickel alloys as a function of nickel content"> [[File:Strain hardening of copper nickel alloys as function.jpg|left|thumb|<caption>Strain hardening of copper-nickel alloys as a function of nickel content</caption>]]</figure> <figure id="fig:Strain hardening of CuNi25 by cold working"> [[File:Strain hardening of CuNi25 by cold working.27jpg|left|thumb|<caption>Strain hardening of CuNi25 by cold working</caption>]]</figure> <figure id="fig:Softening of CuNi25 after 1 hr annealing after 50% cold working">[[File:Softening of CuNi25 after annealing after 50.jpg|left|thumb|<caption>Softening of CuNi25 after 1 hr annealing after 50% cold working</caption>]]</figure> <figure id="fig:Strain hardening of CuNi9Sn2by cold working (Wieland)">[[File:Strain hardening of CuNi9Sn2 by cold working.jpg|left|thumb|<caption>Strain hardening of CuNi9Sn2 by cold working (Wieland)</caption>]]</figure> <figure id="fig:Softening of CuNi9Sn2 after 1 hr annealing after 60%cold working (Wieland)">[[File:Softening of CuNi9Sn2 after annealing Wieland.jpg|left|thumb|<caption>Softening of CuNi9Sn2 after 1 hr annealing after 60% cold working (Wieland)</caption>]]</figure></div><div class="clear"></div> ==References==[[Contact Carrier Materials#References|References]] [[de:Sonstige_naturharte_Kupfer-Legierungen]]