材料工程Issue(4)：68-71,81,5.
室温压缩AZ91镁合金显微组织及β-Mg17Al12相析出动力学
Microstructure and Precipitation Kinetics of β-Mg17Al12 Phase in AZ91 Alloy Compressed at Room Temperature
摘要
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 tempera-ture, were investigated. The results showed that lots of twinning would emerge as a result of com-pression at room temperature, serving as nucleation substrate for β-Mg17 Al12 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-Mg17 Al12 phase precipitated in twinning and the crMg matrix. The amount of β-Mg17Ali2 phase increased with gradu-ally aging time, whereas the required time for a definite amount of precipitates decreased with increas-ing temperature. The activation energy for β-Mg17 Al12 phase precipitation in AZ91 alloy was calculated to be 23. 8-37. 9kJ/mol using the JMAK equation, in accordance with experimental data.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Key words
magnesium alloy/ room temperature compression/ microstructure/ precipitation kinetics of β-Mg17Al12 phase/activation energy分类
矿业与冶金引用本文复制引用
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):68-71,81,5.基金项目
“十二五”国家科技支撑计划资助项目(2011BAE22B00) （2011BAE22B00）
