Effect of tool rake angle on microstructure and properties of ultra fine-grained pure copper [刀具前角对超细晶纯铜组织与性能的影响]

作者：Zou Z.; Wu B.; Liu L.

来源：Heat Treatment of Metals, 2018, 43(1): 121-125.

DOI：10.13251/j.issn.0254-6051.2018.01.025

• Hardness
• Large strain extrusion machining
• Microstructure
• Thermal stability
• Tool rake angle
• Ultra fine-grained pure copper

The annealing treatments were conducted under different temperatures for ultrafine-grained pure copper produced by large strain extrusion machining with different tool rake angels. The microstructure and properties evolution before and after deformation and annealing were studied by means of optical microscope, scanning electron microscope and micro-hardness test, etc. The results show that when processed with 30° rake angle tool, the grains of pure copper material are obviously refined from about 100 μm to sub micron elongated ones, and the macrohardness is increased from 85 HV0.05 to 135 HV0.05. However, when processed with 10° rake angle tool, the grains are further refined to fine equiaxed grains, even to nanocrystals, the microhardness is further enhanced to 150 HV0.05 as well. Additionally, smaller the rake angle, lower temperature the recrystallization begins and smaller the grain after recrystallization, higher the micro-hardness as well. Whatever rake angle tool is used, 10° or 30°, the ultrafine-grained pure copper can maintain a good thermal stability at temperatures below 240 ℃.

• 出版日期2018
• 单位华南理工大学