用透射电镜相分析方法测定了Ti-Al-La三元系在600℃等温截面上α_2相析出相界.结果表明,相界曲线上存在一个Al含量的极大点.根据α_2相形成的电子浓度规律和La的内氧化反应过程,定性地解释了实测相界的走向和Al含量极大点的出现.
The phase boundary of α_2 precipitation at 600℃ in Ti-Al-La ternary systemhas been determined by TEM examination, which shows three kinds of phase regions, namelythe single α phase region, the transitional region where there is superlattice reflection but no α_2precipitation and the α+α_2 region. A point of maximum aluminium content was found to exist onthe α/α+a_2 boundary and the track of the boundary was explained in terms of the internal oxida-tion of lanthanum and the electron concentration rule for α_2 formation
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