Characterizations of mechanically alloyed Ti–Zr–Cu–Ni powders

Influences of Zr and Ti contents on amorphization of Ti–Zr–Cu–Ni alloy induced by mechanical alloying are studied. It is found that by increasing Zr content, the 100 h-milled Cu58-xZrxTi34Ni8 (at %) alloys change from a single fcc solid solution (x=0) to a partially amorphous state (x=11) and finally to almost a single amorphous phase (x≥31). By changing Ti content, partial amorphization is confirmed to occur in the Cu47Zr11Ni42-xTix (at.%) alloy with x≥22. Influences of Zr and Ti contents on the thermal stability of the as-milled Cu58-xZrxTi34Ni8 and Cu47Zr11Ni42-xTix alloys are investigated by means of a differential scanning calorimeter and X-ray diffraction. Oxidation of zirconium in the above as-milled alloys upon heating is discussed.