Influence of predeformation on ageing in an Al-Zn-Mg alloy -: I.: Microstructure evolution and mechanical properties
Influence of predeformation on ageing in an Al-Zn-Mg alloy -: I.: Microstructure evolution and mechanical properties
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DOI：
10.1016/s1359-6454(98)00293-6
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发表时间：
1998-12-10
期刊：
影响因子：
9.4
通讯作者：
Bréchet, Y
中科院分区：
文献类型：
--
作者：
Deschamps, A;Livet, F;Bréchet, Y
研究了三元Al-Zn-Mg合金的时效动力学，以及预应变与后续时效的耦合作用。使用DSC研究沉淀序列。使用TEM和小角X射线散射跟踪显微组织，并通过硬度测量研究沉淀导致的硬化。预应变的效果取决于显着的热机械处理的参数，并已被认为是均匀沉淀和非均匀沉淀之间的竞争位错。预应变对峰值硬化的影响受硬化η '相的形核控制，因此，它主要取决于加热到时效温度的速率。预应变对过时效的影响是增加整体粗化动力学由于相结合的更快的沉淀物粗化位错和溶解均匀的沉淀物，然后溶质扩散到位错。(C)1998年冶金学报由爱思唯尔科技有限公司出版。保留所有权利。
We investigate the ageing kinetics of a ternary Al-Zn-Mg alloy, and the coupling between prestraining and subsequent ageing. The precipitation sequence is investigated using DSC. The microstructure is followed using TEM and Small-Angle X-ray Scattering, and the hardening resulting from precipitation studied by hardness measurements. The effect of prestraining depends significantly on the parameters of the thermomechanical treatment, and has to be considered in terms of competition between homogeneous precipitation and heterogeneous precipitation on dislocations. The effect of prestraining on peak hardening is controlled by the nucleation of the hardening eta' phase, and therefore depends critically on the heating rate to the ageing temperature. The effect of prestraining on overageing is an increase in overall coarsening kinetics due to the combination of faster precipitate coarsening on dislocations and dissolution of homogeneous precipitates followed by solute diffusion towards dislocations. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved.