Pd-25W合金组织与性能研究

将Pd-25W合金铸锭经过冷锻、轧制、中间退火、拉拔制备出φ0.05 mm的丝材，研究了合金的组织结构、电学性能和力学性能。结果表明，所得合金铸态组织为均匀、等轴、致密的树枝晶，晶粒生长取向平行于圆锭中心线；合金在400℃以上加热慢冷时发生短程有序转变(K效应)，引起合金电学性能和力学性能的变化:电阻率、抗拉强度和维氏硬度的增加。900℃保温30 min退火慢冷，可获得综合性能优良的高阻高耐磨精密电阻合金。

Research on Microstructure and Properties of Pd-25W Alloys

The Pd-25W alloy ingot undergoes cold forging, rolling, intermediate annealing and drawing to prepare a wire with a diameter of 0.05 mm. Its microstructure, electrical properties and mechanical property were investigated. The results showed that the obtained alloy ingot was homogeneous, equiaxial and dense dendrite, and that the grain growth orientation was parallel to the center line of the round ingot. A short-range order transition (K effect) occured when it was heated at above 400°C followed by slow cooling, resulting in changes of electrical and mechanical properties, and its electrical resistivity, ultimate tensile strength and vickers hardness increased. Wear-resisting precious electrical resistance alloy with excellent comprehensive performance can be obtained by annealing at 900°C for 30 min followed by slow cooling.