固溶时间对Al-Ni耐热合金导线组织、硬度和导电性能的影响

Effects of Solid Solution Time on Microstructure, Hardness and Conductivity of Al-Ni Heat-resistant Alloy Wire

以半连铸连轧加工Al-0.1Ni合金,研究了固溶处理时间对其组织、硬度和导电性能的影响。研究表明：铸态Al-0.1Ni合金组织晶粒大小及分布不均,存在明显成分偏析,有大量块状或针状的第二相粒子聚集在晶粒内或晶界上。经过520℃×8 h的均匀化处理后,Al-0.1Ni合金晶粒更为均匀,成分偏析得到改善,第二相粒子发生了部分溶解。轧制态Al-0.1Ni合金经580℃×12 h固溶后,组织中第二相最大程度溶解,且晶粒未发生粗化现象。此时,Al-0.1Ni合金硬度达到最大值23.7 HV,合金电导率达到61.4%IACS。

The effects of solid solution time on the microstructure, hardness and electrical conductivity of Al-0.1Ni alloy were investigated by semi continuous casting and rolling. The research shows that, the grain size and distribution of the cast Al-0.1Ni alloy are uneven, and there is obvious segregation of composition in the cast Al-0.1Ni alloy, and a large number of massive or needle-shaped second phase particles gather in grains or at grain boundaries. The grain size of Al-0.1Ni alloy is more uniform after homogeneous treatment at 520 ℃ ×8 h, and the component segregation is improved, the second phase particle dissolves partially. When the rolled Al-0.1Ni alloy is solution treated at 580 ℃ for 12 h, the second phase in the microstmcture is dissolved to the maximum extent, and grain coarsening does not occur. At this time, the hardness of Al-0.1Ni alloy reaches the maximum value of 23.7 HV, and the electrical conductivity of the alloy reaches 61.4%IACS.