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利用透射电镜(TEM)研究了Zr-4合金吸氢后析出氢化物的类型、形貌及其位相关系。结果表明,随着吸氢量的增加,Zr-4合金中依次析出了δ-Zr H_(1.6)及ε-Zr H_(1.8)氢化物。δ氢化物主要以板条状从α-Zr基体上析出,二者的取向关系为(0001)α//(001)δ,[20]α//[110]δ。ε氢化物以针状形貌从δ氢化物中析出,析出的ε氢化物的密排面(1)与δ氢化物的密排面(1)平行,二者的取向关系为(1)δ//(1)_ε,[12]_δ//[011]_ε。高分辨观察进一步表明,δ-Zr H_(1.6)及ε-ZrH_(1.8)氢化物的晶格点阵均出现了严重的扭曲变形,说明相变存在较大的应力集中。
Transmission electron microscopy (TEM) was used to study the type, morphology and phase relationship of hydride precipitated from Zr-4 alloy after hydrogen absorption. The results showed that δ-Zr H_ (1.6) and ε-Zr H_ (1.8) hydride were precipitated in Zr-4 alloy with the increase of hydrogen absorption. δ hydride mainly precipitated from the α-Zr matrix in the form of slats with the orientation relationship of (0001) α // (001) δ, [20] α // [110] δ. The ∈ hydride precipitates from the δ hydride in a needle-like morphology. The close-packed surface (1) of the precipitated ∈ hydride is parallel to the close-packed surface (1) of the δ hydride. The orientation relationship between the two is (1) δ // (1) _ε, [12] _δ // [011] _ε. High-resolution observation further showed that the lattice lattice of δ-Zr H_ (1.6) and ε-ZrH_ (1.8) hydrides all experienced serious distortion, indicating that there was a large stress concentration in the phase transition.