In-situ small-angle X-ray scattering study of dynamic precipitation in an Al-Zn-Mg-Cu alloy

被引：79

作者：

Deschamps, A

Bley, F

Livet, F

Fabregue, D

David, L

机构：

[1] Inst Natl Polytech Grenoble, CNRS, UMR 5614, Lab Thermodynam & Physicochim Met, F-38402 St Martin Dheres, France

[2] Inst Natl Sci Appl, CNRS, UMR 5510, Grp Etud Met Phys & Phys Mat, F-69621 Villeurbanne, France

来源：

PHILOSOPHICAL MAGAZINE | 2003年 / 83卷 / 06期

关键词：

D O I：

10.1080/0141861021000051091

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dynamic precipitation during roorn-temperature deformation,of an Al-Zn-Mg-Cu alloy in solid solution has been investigated using in-situ small-angle X-ray scattering measurements during tensile tests, performed at the European Synchrotron Radiation Facility. Guinier-Preston (GP) zones are observed to form continuously during the deformation process, and the quantitative measurement of their size and volume fraction shows that their precipitation kinetics are much faster than those of static precipitation., A strong negative strain-rate sensitivity of dynamic precipitation has been observed. A model for the hardening effect of the GP zones is deduced from the evolution of yield stress during static ageing at room temperature. This model is applied to the dynamic precipitation kinetics in order to describe the anomalously high strain-hardening rate observed in these deformation conditions. The kinetics of dynamic precipitation are discussed in terms of semiphenomenological models based on the dynamic strain-ageing theory.

引用

页码：677 / 692

页数：16

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