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首页> 外文期刊>Materials Science and Engineering >Towards a comprehensive understanding of creep: Microstructural dependence of the pre-exponential term in Al
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Towards a comprehensive understanding of creep: Microstructural dependence of the pre-exponential term in Al

机译：全面了解蠕变：Al中指数前项的微观结构依赖性

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摘要

We show that the equation proposed by Takeuchi and Argon to explain the creep behavior of Al-Mg solid solution can be used to describe also the creep behavior of pure aluminum. In this frame, it is possible to avoid the use of the classic pre-exponential fitting parameter in the power law equation to predict the minimum creep strain rate. The effect of the fractal arrangement of dislocations, developed at the mesoscale, must be considered to fully explain the experimental data. These ideas allow improving the recently introduced SSTC model, fully describing the primary and secondary creep regimes of aluminum alloys without the need for fitting. Creep data from commercially pure A199.8% and Al-Mg alloys tested at different temperatures and stresses are used to validate the proposed ideas.
机译：我们表明，Takeuchi和Argon提出的用于解释Al-Mg固溶体蠕变行为的方程式也可以用来描述纯铝的蠕变行为。在此框架中，可以避免在幂律方程中使用经典的指数前拟合参数来预测最小蠕变应变率。必须充分考虑以中尺度形成的位错的分形排列的影响，才能充分解释实验数据。这些想法可以改进最近推出的SSTC模型，从而完全描述了铝合金的初级和次级蠕变状态，而无需进行拟合。来自商业纯A199.8％和Al-Mg合金在不同温度和应力下测试的蠕变数据用于验证所提出的想法。

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