MACROSCOPIC KINETICS OF DISCONTINUOUS PRECIPITATION IN A MG-8.5 WT-PERCENT AL-ALLOY

被引：45
|
作者：
DULY, D [1 ]
BRECHET, Y [1 ]
CHENAL, B [1 ]
机构：
[1] PECHINEY, CTR RECH VOREPPE SA, F-38340 VOREPPE, FRANCE
来源：
ACTA METALLURGICA ET MATERIALIA | 1992年 / 40卷 / 09期
关键词：
D O I：
10.1016/0956-7151(92)90147-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The macroscopic kinetics of discontinuous precipitation in two Mg-8.5 wt% Al alloys with different initial average grain sizes has been studied at 220-degrees-C by quantitative optical metallography, hardness measurements and integrated intensity measurements of the precipitate peaks during in situ X-ray experiments. The kinetics observed can be described by Johnson-Mehl-Avrami's law, which indicates that a reaction front stops when it meets an immobile grain boundary. Moreover, the precipitation nodule nucleation probably takes place via the mechanism observed and described by Fournelle and Clark, as can be infered from the grain size dependence of the nucleation rate.
引用
收藏
页码：2289 / 2300
页数：12
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