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首页> 外文会议>Symposium on Creep Deformation and Fracture, Design, and Life Extension; 20050925-28; Pittsburgh,PA(US) >Creep of Zirconium and Zirconium Alloys
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Creep of Zirconium and Zirconium Alloys

机译：锆和锆合金的蠕变

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摘要

Cumulative zirconium and zirconium alloy creep data over a broad range of stresses (0.1 to 115 MPa) and temperatures (300 to 850℃) were analyzed based on an extensive literature review and experiments. Zirconium obeys traditional power-law creep with a stress exponent of approximately 6.4 over stain-rates and temperatures usually associated with the conventional "five-power-law" regime. The measured activation energies for creep correlated with the activation energies for zirconium self-diffusion. Thus, dislocation climb, rather than the often assumed glide mechanism, appears to be rate controlling. The common zirconium alloys (i.e. Zircaloys) have higher creep strength than zirconium. The stress exponents of the creep data in the five-power-law regime was determined to be 4.8 and 5.0 for Zircaloy-2 and Zircaloy-4, respectively. The creep strength of irradiated Zircaloy appears to increase relative to unirradiated material. It was found that the creep behavior of zirconium was not sensitive to oxygen in the environment over the temperature range examined.
机译：在广泛的文献综述和实验的基础上，分析了在广泛的应力（0.1至115 MPa）和温度（300至850℃）范围内的累积锆和锆合金的蠕变数据。锆服从传统的幂律蠕变，在通常与常规“五幂律”制度相关的沾污率和温度范围内，应力指数约为6.4。测得的蠕变活化能与锆自扩散的活化能相关。因此，位错爬升，而不是通常假定的滑行机制，似乎是速率控制。常见的锆合金（即锆合金）具有比锆更高的蠕变强度。 Zircaloy-2和Zircaloy-4在五次幂定律条件下的蠕变数据的应力指数分别确定为4.8和5.0。相对于未辐照的材料，辐照的锆合金的蠕变强度似乎有所提高。发现在所研究的温度范围内，锆的蠕变行为对环境中的氧气不敏感。

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