机械球磨对热挤压W-40Cu材料组织和性能的影响

The Influence of Mechanical Milling on Microstructure and the Properties of W-40Cu Composite by Hot Extrusion

摘要:

通过对W-40Cu（质量分数，%，下同）混合粉末经不同时间机械球磨后进行热挤压，获得了W-40Cu合金。研究了机械球磨对热挤压坯料组织和性能的影响。结果表明，长时间的机械球磨对热挤压坯料组织和性能产生了不利的影响，坯料内部钨相尺寸随着球磨时间的延长而出现了明显的大小不均，同时材料的相对密度和电导率随着球磨时间的延长逐渐降低，硬度值稍有升高。

Abstract:

The mixed powder of W-40Cu ball-milled for different time was cold-pressed into a compact, then it was hot-extruded into W-40Cu composite. The effects of the mechanical ball milling on the microstructure and the performance of the composite were investigated. The results show that ball milling for long time has unbenefical effect on the microstructure and the performance of the composite. With prolonging of ball milling, the inhomogeneity of tungsten phase size within the composite appears obviously, the density and specific conductance of the composite decrease, and the hardness increases.