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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。
In this paper, TEM and other methods were used to study the interface phase of the newly developed Ti-5123 alloy with near-α structure. No obvious interfacial phase appeared in the alloys aged at or below 800 ℃ after quenching and quenching, and interfacial phase appeared after aging at 800 ℃. The M layer of the interface phase is of the structure f.c.c. The orientation relationship is (001) _m // (110) β, [110] _m // [111] β. The S-layer is a hexagonal structure that has a twin relationship with {1011} <1012>. Two-phase titanium alloy formed by the diffusion of the alloy element concentration gradient at the phase interface under the appropriate heating temperature and cooling conditions, resulting in the change of the electron concentration in the region is the main factor of the interface phase formation in the titanium alloy.