The changes in button ingot mass of pure Ti

pure Al

TiAl binary alloy and TiAl-Nb ternary alloy after PAM have been observed with the same vacuum degrees. The observation reveals that while the mass loss of pure Ti is great at the first melt and then the mass tends to be unchanged

the change in mass of pure Al is decreased with increasing remelting times after PAM

which demonstrates that the evaporation of Al is mainly responsible for the mass loss of the alloy during PAM. The mass loss of Al in the alloys is slightly higher than that of other elements due to the higher superheat degree of Al element with melting binary TiAl alloy and TiAl-Nb ternary alloy at the same parameters

in which the mass loss of the Al increase with increasing the remelting times and Al content. The mass losses of TiAlNb alloy prepared with different raw materials （pure Nb strip or Nb-Al master alloy） are different

where the mass losses of the ternary alloy prepared with pure Nb is higher than that of one prepared with Nb-Al master alloy. The mass of the TiAlNb alloy would tend to be stable after 6 remeltings

whose relative mass loss is only 0.33%

lower than that of Al in other remelting methods.