Modeling the effect of Al3Sc precipitates on the yield stress and work hardening of an Al–Mg–Sc alloy
Modeling the effect of Al3Sc precipitates on the yield stress and work hardening of an Al–Mg–Sc alloy
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DOI：
10.1016/j.actamat.2007.12.039
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发表时间：
2008-05
期刊：
影响因子：
9.4
通讯作者：
F. Fazeli;W. Poole;C. Sinclair
中科院分区：
文献类型：
--
作者：
F. Fazeli;W. Poole;C. Sinclair
沉淀硬化合金的屈服应力和加工硬化行为与移动的位错和沉淀物之间的相互作用的性质直接相关。在诸如铝合金的商业系统中，由于各种机制之间的重叠以及沉淀物的体积分数和尺寸与残余固溶体含量之间的相互作用，对该问题的理解变得复杂。在这项研究中，模型Al-2.8wt.% Mg-0.16wt.%选择Sc合金进行检查，因为沉淀涉及简单的球形沉淀物，不存在亚稳相，并且固溶体效应由镁含量主导。使用以前开发的沉淀模型，它已经可以开发一个集成的屈服应力/加工硬化模型，其中的剪切/非剪切过渡和沉淀物的尺寸分布明确占。模型和实验之间的协议是优秀的和剪切/非剪切过渡半径是与实验观察一致。
The yield stress and work hardening behaviour of precipitation hardening alloys is directly related to the nature of the interaction between mobile dislocations and precipitates. In commercial systems such as aluminium alloys, the understanding of this problem is complicated by the overlap between various mechanisms and the interplay between the volume fraction and size of precipitates and the residual solid solution content. In this study a model Al–2.8wt.% Mg–0.16wt.% Sc alloy has been chosen for examination since precipitation involves simple spherical precipitates, the absence of metastable phases and the solid solution effect is dominated by the magnesium content. Using a previously development precipitation model, it has been possible to develop an integrated yield stress/work hardening model in which the shearable/non-shearable transition and the size distribution of precipitates are explicitly accounted for. The agreement between the model and the experiments is excellent and the shearable/non-shearable transition radius is consistent with experimental observations.