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室温压缩AZ91镁合金显微组织及β-Mg17Al12相析出动力学
引用本文:杨林,黄婷,林立,刘正.室温压缩AZ91镁合金显微组织及β-Mg17Al12相析出动力学[J].材料工程,2012(4):68-71,81.
作者姓名:杨林  黄婷  林立  刘正
作者单位:沈阳工业大学材料科学与工程学院,沈阳,110870
基金项目:“十二五”国家科技支撑计划资助项目(2011BAE22B00)
摘    要:对常温压缩粗镁直接熔炼AZ91镁合金时效处理后的组织及β-Mg17Al12相析出动力学进行研究。结果表明:AZ91镁合金在常温压缩过程中出现大量的孪晶,为β-Mg17Al12相的析出提供了大量的形核基底;时效时β-Mg17Al12相优先在晶界、孪晶界析出,尤其易在孪晶与晶界、孪晶交接处析出并长大,且孪晶内析出的β-Mg17Al12相与α-Mg基体保持一定的位向关系;时效时间越长,析出的β-Mg17Al12相越多,温度越高,析出定量β-Mg17Al12相所需时间越短;结合实验数据,由JMAK方程计算得到AZ91镁合金析出β-Mg17Al12相激活能为23.8~37.9kJ/mol。

关 键 词:镁合金  室温压缩  显微组织  β-Mg17Al12相析出动力学  激活能

Microstructure and Precipitation Kinetics of β-Mg17Al12 Phase in AZ91 Alloy Compressed at Room Temperature
YANG Lin , HUANG Ting , LIN Li , LIU Zheng.Microstructure and Precipitation Kinetics of β-Mg17Al12 Phase in AZ91 Alloy Compressed at Room Temperature[J].Journal of Materials Engineering,2012(4):68-71,81.
Authors:YANG Lin  HUANG Ting  LIN Li  LIU Zheng
Affiliation:(School of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)
Abstract:Microstructure and precipitation kinetics of β-Mg17Al12 phase after aging treatment in AZ91 alloy,which was fabricated with raw magnesium by direct smelting and compressed at room temperature,were investigated.The results showed that lots of twinning would emerge as a result of compression at room temperature,serving as nucleation substrate for β-Mg17Al12 phase precipitation.The β-Mg17Al12 phase precipitated preferentially at grain and twinning boundaries.Phase precipitation and growth were frequently observed at the intersection between twinning and original grain,or among various twinning;certain orientation relationships were also discovered among the β-Mg17Al12 phase precipitated in twinning and the α-Mg matrix.The amount of β-Mg17Al12 phase increased with gradually aging time,whereas the required time for a definite amount of precipitates decreased with increasing temperature.The activation energy for β-Mg17Al12 phase precipitation in AZ91 alloy was calculated to be 23.8-37.9kJ/mol using the JMAK equation,in accordance with experimental data.
Keywords:magnesium alloy  room temperature compression  microstructure  precipitation kinetics of β-Mg17Al12 phase  activation energy
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