Kinetics and mechanism of formation and transformation of metastable β′-phase in Al–Mg alloys
Kinetics and mechanism of formation and transformation of metastable β′-phase in Al–Mg alloys
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DOI：
10.1016/j.matchemphys.2003.11.001
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发表时间：
2004-03
影响因子：
4.6
通讯作者：
D. Hamana;L. Baziz;M. Bouchear
中科院分区：
文献类型：
--
作者：
D. Hamana;L. Baziz;M. Bouchear
通过光学显微镜观察完成的膨胀曲线和量热曲线的分析，可以跟踪Al-12wt.%Mg合金时效过程中β‘相颗粒的动力学和形态变化。现在公认的是，β‘相粒子是半共格的和亚稳态的，如相图所预测的那样，最初以球状出现，转变成细针状，然后在长时间时效后变成平衡β相的粒子。此外，在非等温时效过程中，β‘相和β’相相继而独立地形成和溶解。
The analysis of dilatometric and calorimetric curves, completed by optical microscopy observations, permitted to follow the kinetics and the morphology changes of β′-phase particles during ageing of Al–12wt.% Mg alloy. It is now well established that β′-phase particles, which are semi-coherent and metastable, appear initially in a globular shape, transform into thin needles, then into particles of the equilibrium β-phase after a long ageing time, as predicted by the phase diagram. In addition, β′ and β-phases are formed and dissolved successively and independently one of the other, during non-isothermal ageing.