Fig. 1. HCP structure Zr matrix (a) Crystal direction and X, Y, Z axis direction, (b) Initial model

Fig. 2. Different densities of hydride placed in Zr matrix (a) A layer of hydride, (b) Five layers of hydride

Fig. 3. Stress-strain curves corresponding to Zr substrates with different hydride densities

Fig. 4. Yield strength and Young's modulus of the Zr-based model correspond to different hydride densities

Fig. 5. Stress concentration and dislocation during tensile simulation with the hydride density of 154 µg·g^-1 at strain 0.12 (a) Dislocation defects around the hydride, (b) Locally amplified dislocation defect regions, (c) Stress concentration around the hydride

Fig. 6. Microstructure evolution during tensile simulation with different hydride densities (a) 154 µg·g^-1, (b) 308 µg·g^-1, (c) 402 µg·g^-1, (d) 616 µg·g^-1

Fig. 7. Hydride tip stress values in tensile simulation with different hydride densities

Fig. 8. Length variation curve of dislocation line in tensile simulation with different hydride densities

Fig. 9. Dislocation evolution during the tensile simulation with the hydride density of 1 078 µg·g^-1 under different strains (a) Strain is 0.09, (b) Strain is 0.12

Fig. 10. Stress cloud diagram of different hydride densities at strain 0.08 (a) 1 078 µg·g^-1, (b) 1 386 µg·g^-1