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Mechanism of creep deformation with evolution of microstructure and texture of Zr-2.5Nb alloy

机译：Zr-2.5Nb合金蠕变变形与组织和织构演变的机理。

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The creep behavior of Zr-2.5Nb alloy has been studied in the temperature range of 350–450 °C and stress range of 82–283 MPa using constant load creep tests. The creep parameters such as creep activation energy (QC), and stress exponent (n) have been determined following the temperature-compensated power law, and are found to be 247 ± 5.0 kJ/mol and 5.5 ± 0.27, respectively. The value of threshold stress was obtained by varying the stress exponent. This subsequently led to evaluation of the true stress exponent (∼ 4.02 ± 0.19) and true activation energy (∼116 kJ/mol), which is close to that for lattice-self diffusion of zirconium alloys. The results of creep data suggest that rate-controlling mechanism of creep is dislocation climb. Basal component (0002) along transverse direction was observed in the as-received condition, whereas in the sample creep tested at 450 °C, the components are (0002) and(101̅0). Similar type of microtexture evolution has been observed in the samples subjected to creep failure or interrupted creep tests at 450 °C under a constant stress of 82 MPa. The microtexture components observed in the creep tested samples were {0002}<112̅0>and<112̅0>fiber. As such, there is no change in microtexture components for interrupted creep tests performed at different stages of creep. Microstrucutral observations of the creep tested samples were characterized by using the transmission electron microscopy (TEM) to reveal the dislocation substructures, and niobium rich precipitate particle of β-(Nb, Zr) in the alloy.
机译：Zr-2.5Nb合金的蠕变行为已在350-450 C的温度范围和82-283 MPa的应力范围内进行了恒定载荷蠕变测试。蠕变参数如蠕变活化能（QC）和应力指数（n）已根据温度补偿的幂定律确定，分别为247±5.0 kJ / mol和5.5±0.27。通过改变应力指数获得阈值应力值。随后导致对真实应力指数（〜4.02±0.19）和真实活化能（〜116 kJ / mol）的评估，这与锆合金的晶格自扩散相近。蠕变数据的结果表明，蠕变的速率控制机制是位错爬升。在接收状态下观察到沿横向的基础成分（0002），而在450 C下蠕变测试的样品中，成分为（0002）和（101̅0）。在经受了450 failureC，82 creepMPa恒定应力的蠕变破坏或间断蠕变试验的样品中，观察到了类似类型的微观组织演变。在蠕变测试的样品中观察到的微织构成分为{0002} <112̅0>和<112̅0>纤维。因此，在蠕变的不同阶段进行的中断蠕变测试的微观纹理组件没有变化。通过透射电子显微镜（TEM）表征蠕变测试样品的显微组织观察，以揭示位错亚结构以及合金中β-（Nb，Zr）的富铌沉淀颗粒。

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