There occur four three phase fields of isothermal sections in Ni Pt Ta system at 1? 423 K, which are: Pt 2Ta+(Ta)+NiTa 2;

• 实验发现Ni Pt Ta三元系 14 2 3K的等温截面有 4个三相区 ,即 :Pt2 Ta +(Ta) +NiTa2 ;