Ti—5123合金中的界面相研究

The Study of Interface Phase in Ti-5123 Alloy

本文用TEM等方法对新研制的近α型结构钛合金Ti—5123合金的界面相进行研究。淬火和淬火后低于800℃时效的合金均未出现界面相,800℃时效后始有界面相出现。界面相的M层为f.c.c.结构,取向关系为(001)_m//(110)β,[110]_m//[111]β。S层为与α成{1011}<1012>孪晶关系的六方结构。两相钛合金在合适的加热温度和冷却条件下,在相界面处形成由扩散产生的合金元素浓度梯度,导致了该区域电子浓度的变化,是该钛合金中界面相形成的主要因素。

The interface phase in a newly developed near a titanium alloy Ti-5123 was investigated by TEM. No interface phase was found after quenching and subsequent aging below 800℃. After aging at 800℃ ,the interface phase appeared at the α/β boundaries. The M layer of the interface phase was showed to be an f. c. c. and its orientation relationship may be expressed as (001)m || (110)β and [110]m || [111]β. The Slayer of the interface phase was showed to possess hexagonal and twin related to the a on {1011} <1012>. The element concentration gradient produced by diffusion at the boundaries under properly heating and cooling led to change of electron concentration, which is probably the main factor to create the interface phase in the Titanium alloy.