Low temperature post-precipitation after precipitation of β′ and β phases in Al-12 wt.% Mg alloy
Low temperature post-precipitation after precipitation of β′ and β phases in Al-12 wt.% Mg alloy
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DOI：
10.1016/j.msea.2007.04.120
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发表时间：
2008-03-15
期刊：
影响因子：
6.4
通讯作者：
Azizi, A.
中科院分区：
文献类型：
--
作者：
Hamana, D.;Azizi, A.
透射电镜观察证实，经过250℃预均匀、淬火和时效处理的al - 12wt .% Mg合金在室温自然时效后，与p相颗粒密切相关的Guinier-Preston （GP）区存在。每次样品在室温下充分成熟后，经过第一次预沉淀（GP区形成）或沉淀（β′或β相形成），新的区域形成而不存在淬火空位。由于在水中快速淬火后得到的淬火空位大大增加了β′相和β相的形成速度，并达到了它们的平衡浓度，因此GP带的形成在没有它们存在的情况下发生。这些结果是通过膨胀和量热分析初步得到的，由于它们对不同析出阶段的敏感性，证实了它们在研究不同合金时效过程中的重要性和互补性。(c) 2007 Elsevier B.V.版权所有
TEM observation confirms the presence of Guinier-Preston (GP) zones in close association with particles of P-phase after natural ageing at room temperature of Al-12 wt.% Mg alloy which has been preliminary homogenised, quenched and aged at 250 degrees C. Each time the sample is sufficiently matured at ambient temperature, after a first pre-precipitation (formation of GP zones) or precipitation (formation of beta' or beta phases), new zones form without the presence of the quenched-in vacancies. Since quenched-in vacancies, obtained after a rapid quench in water, have greatly increased the rate of beta' and beta phases formation and have reached their equilibrium concentration, the GP zones formation occurs without their presence. These results have been obtained preliminary by dilatometric and calorimetric analysis, which confirm their importance and their complimentarily in the study of the ageing processes in different alloys due to their sensitivity to various precipitation stages. (c) 2007 Elsevier B.V. All rights reserved.