热焱,邱克强,任英磊,李荣德

• 1:沈阳工业大学材料科学与工程学院
• 2:辽宁省轻金属材料重点实验室

摘要(Abstract)：

采用XRD、SEM和EDS研究了热处理温度对ATX525镁合金相组成、显微组织和析出相成分的影响,考察了保温时间为24 h条件下,Ca Mg Sn相随温度变化的演化规律。结果表明,合金组织中析出相由热稳定性较高的Mg2(Al,Ca)、Al2Ca和Ca Mg Sn等相组成。其中,Ca Mg Sn相中Sn和Ca含量随处理温度变化而变化,从而使其热稳定性和形貌发生变化。当温度低于500℃时,主要发生Ca Mg Sn溶断和破碎过程,体积分数没有显著变化;当温度为550℃时,Ca Mg Sn相发生溶入基体过程,体积分数减少;然而当处理温度为570~600℃,Ca Mg Sn相出现长大现象。获得细化Ca Mg Sn相貌的热处理温度为500~550℃。合金经过550℃/24 h处理后,经200℃/96 h时效,Ca Mg Sn相以条状和细小的颗粒状析出,与颗粒形貌相比,条状Ca Mg Sn相具有铸态时的形貌特征。

关键词(KeyWords)： 镁合金;热处理温度;组织;Ca Mg Sn相;形貌

Abstract:

Keywords:

基金项目(Foundation): 沈阳市科技计划项目(F12-277-1-34,F12-277-1-35)

作者(Author): 热焱,邱克强,任英磊,李荣德

DOI: 10.13289/j.issn.1009-6264.2015.04.017

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