Abstract
Titanium and boron powders having a molar ratio of Ti/B=1/2 were mixed to copper powder with compositions as Cu-5mol%Ti-10mol%B and Cu-9mol%Ti-18mol%B. They were mechanically alloyed for various milling times by using ball mill. The powders of two different compositions were compacted and bonded to each other. They were sintered at the temperature range of 873K to 1173K for various times. Diffusion of copper and titanium atoms progresses at the interface of the bonded compact by the sintering at high temperature for prolonged time. Thickness of the diffusion layer in the bonded compact which prepared from the powder mechanically alloyed for long milling time becomes more wide than that prepared from the powder mechanically alloyed for short milling time. Rupture strength obtained in the 3-point-bending test of the bonded compact is increased by the sintering. But, the degree of increment of the rupture strength in the sintered compact which prepared from the mechanically alloyed powder decreases with the increase of mechanical alloying time.
