INVESTIGATION OF MICROSTRUCTURE OF MECHANICALLY ALLOYED TIMO PARTICLES USING HIGH-RESOLUTION ELECTRON-MICROSCOPE OBSERVATIONS

Mechanically alloyed TiMo alloy particles were evaluated by high-resol ution electron microscope observations. The particles were mechanicall y alloyed for 36, 72, 144 and 288 ks. Specimens for transmission elect ron microscopy were prepeared by electroplating the particles together with nickel on copper sheets and using an ion-milling machine. It was not difficult to distinguish MA particles in the specimens. MA partic les consisted of small island crystalline parts, 20-50 nm diameter, an d amorphous parts. Lattice fringes of island crystalline parts were me asured and the materials produced by mechanical alloying were identifi ed by their lattice spacings. After alloying for 36 ks, pure titanium and molybdenum still remained and a small amount of beta-TiMo alloy wa s confirmed. After alloying for 72 ks, almost all crystalline parts we re beta-TiMo alloy. Alpha-TiMo and TiFe were found after alloying for 144 ks. Alpha-TiMo alloy seems to be transformed from beta-TiMo alloy on alloying for 144 and 288 ks.