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首页> 外文期刊>Journal of Materials Engineering and Performance >Hot Deformation and Processing Maps of B4C/6061Al Nanocomposites Fabricated by Spark Plasma Sintering
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Hot Deformation and Processing Maps of B4C/6061Al Nanocomposites Fabricated by Spark Plasma Sintering

机译：由火花等离子体烧结制造的B4C / 6061AL纳米复合材料的热变形和处理图

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摘要

We developed 3 vol.% B4C/6061Al nanocomposites by spark plasma sintering. We then characterized their flow and hot deformation behaviors using isothermal compression tests at deformation temperatures of 673-823 K and strain rates of 0.001-1 s(-1). Results indicated that their steady flow characteristic can be described by the Zener-Hollomon parameter (Z) as a hyperbolic-sine function of flow stress. Based on pinning effect from B4C nanoparticles, the estimated activation energy was calculated to be 274.80 kJ/mol. At the unstable deformation condition (723 K/1 s(-1)) with high Z, flow localization appeared; the main softening mechanisms involved are dynamic recovery and dynamic recrystallization (DRX). At the stable deformation condition (823 K/0.001 s(-1)) with low Z, adequate DRX occurred. Based on the processing map and microstructure evolution, the optimum hot working conditions for B4C/6061Al nanocomposites were determined to be a deformation temperature of 773-823 K and a strain rate of 0.001-0.003 s(-1). These working conditions were verified by a hot extrusion test.
机译：我们开发了3 Vol.％B4C / 6061AL纳米复合材料通过火花等离子体烧结。然后，我们使用673-823K的变形温度和0.001-1S（-1）的应变率的等温压缩试验来表征它们的流动和热变形行为。结果表明，它们的稳态流动特性可以由ZENER-HOLLOMON参数（Z）描述为流应力的双曲线正弦函数。基于来自B4C纳米颗粒的固定效果，计算估计的活化能量为274.80kJ / mol。在具有高Z的不稳定变形条件下（723 k / 1s（-1））出现流量定位;所涉及的主要软化机制是动态恢复和动态再结晶（DRX）。在低Z的稳定变形条件下（823 k / 0.001 s（-1）），发生了足够的DRX。基于处理图和微观结构演化，将B4C / 6061AL纳米复合材料的最佳热工作条件确定为773-823k的变形温度和0.001-0.003 s（-1）的应变速率。通过热挤出测试验证了这些工作条件。

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