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用透射电子显微镜对不同轧制变形量的Ti-28Nb-15Ta-4Zr合金进行观察分析。结果表明,该合金在轧制前为单相体心立方β相合金,在轧制变形过程中有形变诱发马氏体α″相形成,α″相为正交晶系,单胞参数a=0.3152 nm,b=0.4854 nm,c=0.4642 nm。β相与α″相的位向关系为[100]α″//[100]β,[010]α″//[01 1]β,[001]α″//[0 1-1-]β,(100)α″//(100)β,(010)α″//(01 1)β,(001)α″//(0 1-1-)β。据此提出形变诱发马氏体α″相变是以(0 1-1-)β为不变平面转变为(001)α″,在(100)β和(01 1)β面上原子经过微小迁移转变成(010)α″和(100)α″的马氏体相变机制。
Transmission electron microscopy (TEM) was used to observe and analyze Ti-28Nb-15Ta-4Zr alloy with different rolling deformation. The results show that the alloy is single-phase body-centered cubic β-phase alloy prior to rolling, and α “phase is formed by deformation-induced martensite during the rolling deformation. The α” 0.3152 nm, b = 0.4854 nm, c = 0.4642 nm. The orientation relationship between the β phase and the α “phase is [100] α” // [100] β, [010] α “// [01 1] β, [001] α” // [0 1-1-] (100) α “// (100) β, (010) α” // (01 1) β, (001) α “// (0 1-1-) β. The transformation of body α ”transforms into (001) α“ with (0-1-1-) β invariant plane, and the atoms migrate to (010) α on (100) β and (01 1) ”And (100) α" martensitic transformation mechanism.