2007 年 48 巻 5 号 p. 909-914
The effect of increased Ta and Nb additions on the structure of high energy ball milled Ti alloys was studied using X-ray diffraction and high resolution TEM. Ball milled powders were consolidated using ultra high pressure from 4–7 GPa at temperatures of 650–700°C. The microstructure of the compacts consisted of ultra fine grains in the range of 20 nm of α and β phases. Micro-hardness measurements showed very high hardness of ball milled and compacted powders close to 7 GPa (slightly decreasing with the increase of alloying additions) and a decrease in the Young’s modulus with the increase of Nb and Ta content i.e. the amount of β phase.
