Development of Cu-Ni-Fe-P alloys with high strength and high conductivity

采用Cu-1.0%Ni-0.2% p （0%Fe）和Cu-(0.9、0.8和0.7)%Ni-(0.1、0.2和0.3)%Fe-0.2% p（0.1、0.2和0.3%Fe）合金，在450℃预时效5min，冷轧至还原40%，450℃峰时效，最后冷轧至还原60% (60R)，研究了Fe对Cu-Ni-Fe- p合金强度的影响。在0%Fe-60R、0.1%Fe-60R、0.2% fe - 60r和0.3%Fe-60R合金中，0.2% fe - 60r合金的抗拉强度最高为700MPa， 0.2% fe - 60r合金的抗拉应力最高为660MPa。经450℃预时效、冷轧降为40%、450℃峰时效、冷轧降为80% （80% cr）的0.2%Fe- 60r合金的抗应力和抗拉强度分别比0.2%Fe- 60r合金高700、740MPa和40MPa。0.2%Fe-80CR合金的抗应力高于0.2%Fe-60R合金，这是由于80CR合金中有更高的位错密度和更多的变形孪晶。

The influence of Fe on the strength of Cu-Ni-Fe-P alloys has been investigated using Cu-1.0%Ni-0.2%P (0%Fe) and Cu-(0.9, 0.8 and 0.7)%Ni-(0.1, 0.2 and 0.3)%Fe-0.2%P (0.1, 0.2 and 0.3%Fe) alloys pre-aged at 450 degrees for 5min, cold-rolled to a 40% reduction, peak-aged at 450 degrees and finally cold-rolled to a 60% reduction (60R). Of the 0%Fe-60R, 0.1%Fe-60R, 0.2%Fe-60R and 0.3%Fe-60R alloys, the 0.2%Fe-60R alloy has the highest 0.2% proof stress of 660MPa and the highest tensile strength of 700MPa. The proof stress and tensile strength of the 0.2%Fe alloy pre-aged at 450 degrees, cold-rolled to a 40% reduction, peak-aged at 450 degrees and finally cryo-rolled to an 80% reduction (80%CR) are 700 and 740MPa and 40MPa higher than those of the 0.2%Fe-60R alloy. The higher proof stress of the 0.2%Fe-80CR alloy than the 0.2%Fe-60R alloy is ascribed to the higher dislocation density and the larger amount of deformation twins in the 80CR alloy.