Effect of Pb and Sb additions on the precipitation kinetics of AZ91 magnesium alloy
Effect of Pb and Sb additions on the precipitation kinetics of AZ91 magnesium alloy
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DOI：
10.1016/j.msea.2006.12.132
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发表时间：
2007-05
期刊：
影响因子：
6.4
通讯作者：
N. Balasubramani;A. Srinivasan;U. Pillai;B. C. Pai
中科院分区：
文献类型：
--
作者：
N. Balasubramani;A. Srinivasan;U. Pillai;B. C. Pai
利用差热分析仪、光学显微镜和扫描电镜研究了Pb和Sb对AZ 91合金时效析出顺序和时效动力学的影响。Pb和Sb的单独加入没有改变AZ 91合金中的析出顺序，但β相溶解所需的焓发生了变化。用Kissinger法对DTA结果进行了定量分析，结果表明Mg 17 Al 12相形成所需的激活能从5.21 kJ/g降低到3.5821 kJ/g。加入Pb后，由5.21 kJ/mol增加到8.37 kJ/mol，这些结果与时效特性有关。
Effect of Pb and Sb additions on the precipitation sequence and ageing kinetics of AZ91 alloy has been studied using the differential thermal analyzer, optical microscopy and scanning electron microscopy. The precipitation sequence in the AZ91 alloy is not altered whereas the enthalpy required for dissolution of β phases changes with respect to the individual additions of Pb and Sb. The quantitative analysis of activation energy calculated from the DTA results using Kissinger method demonstrates the activation energy required for the Mg17Al12phase formation is decreased from 5.21 to 3.5821kJ/mol with Pb addition whereas it is increased from 5.21 to 8.37kJ/mol with Sb and these results are correlated with the ageing characteristics.