A multiphase microstructural system of two types of hydrides; f.c.c. δ and b.c.c.. ε hydride precipitates within a parent h.c.p. zircaloy-4 parent matrix were modelled by a crystalline dislocation-density and a finite-element (FE) method that is specialized for large inelastic strains and nonlinear behavior. The different crystalline structure of the hydrides, the parent matrix, and the orientation relationships between the different crystalline phases have been accounted for and modeled with a validated FE approach. The effects of radial hydride factors, hydride volume fraction, hydride morphology, and hydride orientation and distribution on overall behavior were investigated. The predictions provide an understanding of why a distribution of circumferential hydrides have higher strength and ductility than a distribution of radial hydrides. Furthermore, zircaloy δ (f.c.c.) hydride systems have less ductility and strength than the zircaloy ε (b.c.c.) systems.

两种氢化物的多相微结构系统；fccδ和bcc。通过结晶位错密度和专门用于大型非弹性应变和非线性行为的有限元（FE）方法对母体hcp zircaloy-4母体基质中的ε氢化物沉淀进行建模。氢化物的不同晶体结构，母体基体以及不同晶体相之间的取向关系已得到考虑，并已使用经过验证的有限元方法进行了建模。研究了径向氢化物因子，氢化物体积分数，氢化物形态，氢化物取向和分布对整体行为的影响。这些预测提供了一个理解，为什么圆周氢化物的分布比径向氢化物的分布具有更高的强度和延展性。