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摘要: 研究了常温至1 073 K、不同应变率下(4.110-4 s-1~2.8103 s-1)锆的压缩力学性能。结果表明,锆的流动应力对温度和应变率的变化比较敏感,随应变率的提高而增大,随温度的升高而降低。基于位错动力学理论,建立了锆的本构模型,并考虑塑性变形过程中孪晶演化的影响,对模型进行了修正。修正后的本构模型预测结果与实验结果吻合较好,可描述很宽应变率和温度范围内锆的塑性变形行为。Abstract: The thermo-mechanical response of zirconium has been investigated under temperature ranging from normal temperature to 1 073 K and strain rate from 4.110-4 s-1 to 2.8103 s-1. Results show that the flow stress and strain hardening rate of zirconium are very sensitive to the changes of temperature and strain rate. The flow stress and strain hardening rate increase with the increase of strain rate, and decrease with the increase of temperature. Based on the concept of dislocation kinematics, a physically based constitutive model is developed, and the model is modified by taking into account of the effect of developing twins during deformation. The modified model could be used to predict the flow stress of zirconium over a wide range of temperature and strain rates. The experimental results are in good agreement with the predictions.
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Key words:
- zirconium /
- plastic flow stress /
- high temperature /
- high strain rate /
- constitutive model
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Olinger B, Jamieson J C. Zirconium: Phase and Compressibility to 120 Kilobars [J]. High Temperatures-High Pressures, 1973, 5: 123-131. Zhang Y S, Zhang J Z, Pantea C, et al. Thermal Equations of State of the , and Phases of Zirconium [J]. Phys Rev B, 2005, 71: 184119. Cerreta E, Gray G T, Hixson R S, et al. The Influence of Interstitial Oxygen and Peak Pressure on the Shock Loading Behavior of Zirconium [J]. Acta Materialia, 2005, 53: 1751-1758. Xiao D W, Li Y L, Hu S S, et al. Compression Mechanical Properties of Pure Zirconium [J]. Rare Metal Materials and Engineering. (in Chinese, to be published) 肖大武, 李英雷, 胡时胜, 等. 纯锆的压缩力学行为研究 [J]. 稀有金属材料与工程. (待发表) Laura B A, Ellen K C, Gray G T. Mechanical Behavior of Zirconium and Hafnium in Tension and Compression [J]. Metallurgical and Materials Transactions A, 2005, 36A: 2893-2903. Kaschner G C, Gray G T, Chen S R. The Influence of Texture and Impurities on the Mechanical Behavior of Zirconium [J]. AIP Conference Proceedings, 1998, 429: 435-438. Song S G, Gray G T. Influence of Temperature and Strain Rate on Slip and Twinning Behavior of Zr [J]. Metallurgical and Materials Transactions A, 1995, 26A: 2665-2675. Song S G, Gray G T. Structural Interpretation of the Nucleation and Growth of Deformation Twins in Zr and Ti-Ⅱ. TEM Study of Twin Morphology and Defect Reactions During Twinning [J]. Acta Metall Mater, 1995, 43: 2339-2350. Nemat-Naser S, Li Y Y. Flow Stress of FCC Polycrystals with Application to OFHC Cu [J]. Acta Materialia, 1998, 46(2): 565-577. Kocks U F, Argon A S, Ashby M F. Thermodynamics and Kinetics of Slip [M]. England: Oxford, 1975: 1-271. Christian J W, Mahajan S. Deformation Twinning [J]. Progress in Materials Science, 1995, 39: 1-157. Chichili D R, Ramesh K T, Hemker K J. The High-Strain-Rate Response of Alpha-Titanium: Experiments Deformation Mechanisms and Modeling [J]. Acta Mater, 1998, 46(3): 1025-1043.
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