【摘 要】
：
研究微量Ca添加对AlMg5热变形过程中微观结构稳定性和动态回复行为的影响.研究手段包括扫描电子显微术(SEM)、差示扫描量热法(DSC)、电子背散射衍射(EBSD)分析和透射电子显微
【机 构】
：
Korea Institute of Industrial Technology,156 Gaetbeol-ro,Yeonsu-gu,Incheon 21999,KoreaDepartment of
论文部分内容阅读
研究微量Ca添加对AlMg5热变形过程中微观结构稳定性和动态回复行为的影响.研究手段包括扫描电子显微术(SEM)、差示扫描量热法(DSC)、电子背散射衍射(EBSD)分析和透射电子显微术(TEM).利用JMatPro程序包对合金的凝固路径进行模拟.结果表明,Ca的加入对铸态试样的显微组织和热压缩行为没有影响,但能阻止均匀化过程中晶粒的急剧长大.在热压缩过程中,无Ca合金中的粗晶粒促进合金的动态回复,减缓动态再结晶,其再结晶晶粒的主要形核机制是粒子激发形核.另一方面,热压缩含Ca合金的显微组织受到Al4Ca金属间化合物的显著影响.通过JMatPro预测,并通过DSC、SEM和TEM揭示Al4Ca相的形成.最后,在含Ca合金的晶界处发现Al4Ca析出相通过Zener钉扎效应阻碍α(Al)相的增长,提高均匀化过程中微观结构的稳定性.
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