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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Thermal stability of Al_3(Sc_x,Zr_(1-x))-dispersoids in extruded aluminium alloys
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Thermal stability of Al_3(Sc_x,Zr_(1-x))-dispersoids in extruded aluminium alloys

机译：挤压铝合金中Al_3（Sc_x，Zr_（1-x））-分散质的热稳定性

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摘要

In aluminium alloys the highest resistance against recrystallisation is obtained through combined additions of Sc and Zr. Upon annealing these elements form a high number density of homogeneously distributed and coherent Al_3(Sc_x,Zr_(1-x))-Ll_2-dispersoids, and the coarsening of these phases subsequently control the softening processes of recovery and recrystallisation. In this work the kinetics of of Al_3(Sc_xZr_(1-x))-coarsening has been investigated during annealing of two precipitation annealed and extruded Al-(Mn)-Fe-Si-Sc-Zr-alloys at temperatures between 500 ℃ and 600 ℃. A simple analysis based on widely used theories for volume diffusion controlled dispersoid coarsening (R~3(t) - R_0~3 α t) was used to identify the dominant mechanisms. It was found that coarsening in both alloys is controlled by volume diffusion of Zr, as activation energies, Q, of 285 ± 31 kJ/mol and 250 ± 43 kJ/mol were obtained, respectively.
机译：在铝合金中，通过结合添加Sc和Zr可获得最高的抗再结晶性。退火后，这些元素形成高密度的均匀分布且相干的Al_3（Sc_x，Zr_（1-x））-Ll_2-弥散体，这些相的粗化随后控制了回复和再结晶的软化过程。在这项工作中，研究了Al_3（Sc_xZr_（1-x））-粗化的动力学，研究了两种沉淀退火和挤压成型的Al-（Mn）-Fe-Si-Sc-Zr-Al合金在500℃至200℃之间的退火过程中的动力学。 600℃。通过基于广泛使用的理论的简单分析来确定体积扩散控制的弥散质粗化（R〜3（t）-R_0〜3αt）。发现两种合金的粗化都通过Zr的体积扩散来控制，因为活化能Q分别为285±31 kJ / mol和250±43 kJ / mol。

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