Journal
RARE METALS
Volume 32, Issue 2, Pages 144-149Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-013-0024-2
Keywords
Cu-Ni-Si-Zr alloy; Precipitation; Electrical conductivity; Tensile strength; Microstructural features
Funding
- Project of National 863 Foundation of China [2006AA03Z522]
- Science and Technology of Beijing [10231103]
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The effect of thermomechanical treatments on the microstructures and properties of Cu-2.1Ni-0.5Si-0.2Zr alloy was investigated. The hot-rolled plates were solution treated at 920 A degrees C for 1.5 h, quenched into water, cold rolled by 70 % reduction in thickness, and then aged at 400, 450 and 500 A degrees C for various times. The variation in tensile strength and electrical conductivity of the alloy was measured as a function of the aging time. The results show the peak strength value of 665 MPa for the alloy aged at 450 A degrees C for 2 h. However, the electrical conductivity is observed to reach a maximum of 47 % IACS aged at 450 A degrees C for 8 h. OM, SEM, and TEM were used for microstructural inspection of the alloy. Precipitation occurs preferentially at deformation bands in the cold-rolled alloy. Properties behavior is discussed in the light of microstructural features.
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