Constitutive flow behavior and hot workability of powder metallurgy processed 20 vol.%SiCP/2024Al composite
Constitutive flow behavior and hot workability of powder metallurgy processed 20 vol.%SiCP/2024Al composite
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DOI：
10.1016/j.msea.2010.08.080
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发表时间：
2010-11-15
期刊：
影响因子：
6.4
通讯作者：
Yang, K.
中科院分区：
文献类型：
--
作者：
Shao, J. C.;Xiao, B. L.;Yang, K.
通过热压缩试验研究了粉末冶金加工的 20 vol.%SiCP/2024Al 复合材料的本构流动行为和热加工性能。提出了修正的阿伦尼乌斯型本构方程，其中考虑了作为应变函数的材料常数值。使用动态材料模型（DMM）和改进的DMM来构建功率耗散效率图，并使用齐格勒不稳定准则和盖格尔稳定性准则来构建不稳定图。更细的 SiCP 和更小的 2024Al 粉末产生的更多晶界的存在，将 2024Al 基体的动态再结晶域转移到更高的应变率和更低的温度范围，并降低了功率耗散效率的峰值。在基质/SiCP 界面和 SiCP 簇内发现了以流动局部化和空化形式出现的大的不稳定区域。相比之下，对于这种材料，盖格尔稳定性准则比齐格勒不稳定准则对不稳定区域更敏感。 (c) 2010 Elsevier B.V. 保留所有权利。
Constitutive flow behavior and hot workability of the powder metallurgy processed 20 vol.%SiCP/2024Al composite were investigated using hot compression tests. The modified Arrhenius-type constitutive equations were presented with the values of material constants in consideration as a function of strain. Dynamic material model (DMM) and modified DMM were used to construct the power dissipation efficiency maps, and Ziegler's instability criterion and Gegel's stability criterion were used to build instability maps. The presence of finer SiCP and more boundaries resulting from smaller 2024Al powders shifted the dynamic recrystallization domain of the 2024Al matrix to higher strain rate and lower temperature ranges and decreased the peak value of power dissipation efficiency. Large instable regions were found in the form of flow localization and cavitations located at the matrix/SiCP interfaces and within the SiCP clusters. By comparison, the Gegel's stability criterion was more sensitive to the instability zones than the Ziegler's instability criterion for this material. (c) 2010 Elsevier B.V. All rights reserved.