Heat capacity of CuFePZn (Fe:2,4, Zn:0,12, P:0,03%) vs temperature

Electrical conductivity requirements according standard ASTM B465

Electrical conductivity requirements of C19400 for lead frames

Thermal conductivity and electrical conductivity for CuFe2P (C19400) and different copper alloys

Chemical composition of CW107C according ASTM

Chemical composition of CW107C according MATWEB

Chemical composition of CW107C according Wieland

Chemical composition of CW107C according KME

Mechanical requirements according ASTM standards (different tempers)

Mechanical properties of flat products, 0,64 mm thick

Mechanical properties according DIN EN 12449 (R300 wall thikckness – 10 mm, R70, R420 – wall thickness 5mm)

Hardness of CW107C according DIN EN 12449 (wall thikckness – 10 mm)

Mechanical properties of CW107C flat products Wieland

Hardness vs temper of CW107C

Mechanical properties of CuFe1P according to SofiaMed

Workability – cold working: Initial material was cold worked with rolling reduction: 20% (4.0 mm-3.18 mm), 30% (4.0 mm-2.70 mm), 50% (4.0 mm-1.94 mm), 70% (4.0 mm-1.22 mm), Then mechanical properties and electrical conductivity were investigated. The results of mechanical properties determinations are presented graphically in Fig. 19 and 20. In Fig. 19 average values of ultimate tensile strength (UTS), yield strength (YS) and elongation (A10) for initial samples (after cold rolling from 15mm to 4.0 mm and annealing) are marked on y-axis. Average UTS value was 434 MPa, average YS value was 373 MPa and average elongation A10 value was 10.8%. It was discovered, that hardness did not change significantly up to 70% of rolling reduction, and for this rolling reduction the lowest electrical conductivity was obtained.

Rolling reduction effect on ultimate tensile strength , yield strength and elongation of CuFe2P

Hardness and electrical conductivity vs rolling reduction of CuFe2P

Workability – heat treatment- [7.22]: Specimens 2 mm wide 12 mm thick and 100mm long from the middle of a 12 mm thick hot-rolled strip of C19400 alloy. Their composition: Fe:2,2, P:0,03,Zn:0,12%. The hot rolled specimens were ground to 10 mm in thickness to eliminate the oxidized layer and cold rolled to 2,5 mm in thickness by using a two –roll cold-rolling mill. Next they were solution-treated at 800°C, 900°C and 950°C by immersing them for 1 hour in salt bath and then quenched in water. Then they were cold-rolled to 1 mm in thickness. Next some specimen were not solution-treated, but instead directly cold-rolled to 1 mm in thickness. Temperature of ageing: 450, 500, 550, 600 and 650°C for 2,5,10 and 24 hours.

Variation in electrical conductivity after 1^st cold rolling after solution treatment and after 2^nd cold rolling

Rate of decrease in electrical conductivity vs % reduction (cold rolling) in different aging temperatures (specimens without solution treatment)

Rate of decrease in electrical conductivity vs % reduction (cold rolling) in different aging temperatures (solution treatment 950°C)

Vickers hardness after final cold-rolling as a function of reduction (without solution heat treatment)

Vickers hardness after final cold-rolling as a function of reduction (solution heat treatment – 950°C)

The sheet samples (CuFe2.2P0.05Zn0.16) with 100x10x1.6 mm in thickness were machined from the rectangular cast to solid solution under 850°C for 1 h then hot-rolling, water cooling and cold rolling. Subsequently, the samples were dealt by three-time rolling and two-time aging, that is , first cold rolling, first aging, second cold rolling, second ageing and final fine rolling to sheets about 0.2 mm in thickness and stress-release heat treatment

Table Process parameters of thermo-mechanical deformation

The ageing temperatures of thermo-mechanical treatment 

Fig. 26. Electrical conductivity of  sheets for diferent technological options

The optimized process was as follows: The strip with 1.4 mm thickness was first rolled to 1.0 mm and first aged at 5000C for 2 hours, and second rolled to 0.3 mm and second aged at 450°C for 2 hours, and finally rolled to 0.2 mm and stress-release annealed at 3000C for one hour. The related properties were shown in below table. It was found that final product with relatively good properties , such as the conductivity was  68,5 %IACS and microhardness was 149,9 HV .

The properties of C19400 alloys manufactured using the optimized process

Combination properties of C19400 alloy with various finishing rolling temperatures