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首页> 外文期刊>Materials Science and Engineering >Effect of Al_3(Sc,Zr) dispersoids on the hot deformation behaviour of 6xxx-series alloys: A physically based constitutive model
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Effect of Al_3(Sc,Zr) dispersoids on the hot deformation behaviour of 6xxx-series alloys: A physically based constitutive model

机译：Al_3（SC，Zr）分散体对6XXX系列合金的热变形行为的影响：物理基础的本构模型

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摘要

The hot deformation behaviour of two model Al-Mg-Si alloys was assessed. One alloy was representative of the 6xxx series containing small additions of Mn and Cr, while the other contained small additions of Sc and Zr. Prior to deformation, a multi-stage heat treatment was conducted on the alloys to solutionize the Mg and Si and promote the precipitation of Al_3(Sc,Zr) dispersoids in the Al-Mg-Si-Sc-Zr alloy. Uniaxial hot compression tests were conducted at various temperatures (683-823 K) and strain rates (1-125 s~(-1)) and the resulting flow stress-strain curves were evaluated. Flow stress values were observed to be slightly increased in the alloy containing Sc and Zr. The activation energy for hot deformation and material constants for each alloy were calculated, which in turn provided a good prediction of the experimental data. The post-deformation microstructures were analysed using SEM and TEM. The capacity for dynamic recovery was reduced, while dynamic recrystallization was prevented in the Al-Mg-Si-Sc-Zr alloy. This was a result of restricted dislocation motion, caused by the pinning of dislocations from the Al_3(Sc,Zr) dispersoids. The relative flow stress of the Al-Mg-Si-Sc-Zr alloy was found to compare favourably to other 6xxx series alloys with similar mechanical properties.
机译：评估了两种模型Al-Mg-Si合金的热变形行为。一种合金代表含有少量Mn和Cr的6xxx系列，而另一个包含的SC和Zr的少量添加。在变形之前，对合金进行多级热处理以溶液溶液溶液，促进Al-Mg-Si-Sc-Zr合金中的Al_3（Sc，Zr）分散体的沉淀。在各种温度（683-823K）和应变速率（1-125S〜（-1））和所得流量应力 - 应变曲线时进行单轴热压缩试验。观察到流量应力值在含有Sc和Zr的合金中略微增加。计算用于每个合金的热变形和材料常数的激活能量，其又提供了对实验数据的良好预测。使用SEM和TEM分析后变形微观结构。减少了动态回收能力，而在Al-Mg-Si-Sc-Zr合金中防止了动态重结晶。这是受限制脱位运动的结果，由来自Al_3（Sc，Zr）分散体的剥离引起的钉扎引起的。发现Al-Mg-Si-Sc-Zr合金的相对流动应力与具有类似机械性能的其他6xxx系列合金有利地比较。

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