数控机床零部件用AT33镁合金的变形行为  

Deformation Behavior of AT33 Alloy for CNC Machine Tool Parts

作　　者：赵军华[1] 张娜[1] 

机构地区：[1]河南职业技术学院

出　　处：《特种铸造及有色合金》2015年第10期1024-1027,共4页Special Casting & Nonferrous Alloys

基　　金：十二五国家科技支撑计划资助项目(2014BAH09F00);河南省教育厅教政项目(2012JGLX33)

摘　　要：以变形温度和应变速率为变化参数,研究了轧制Mg-3Al-3Sn镁合金(AT33)在不同变形参数下的组织与性能的变化,通过建立本构方程分析了AT33合金的变形机制。建立了AT33合金高温变形本构方程,并计算出合金的变形激活能为145kJ/mol,应力指数n为6.5,变形机制为晶格扩散控制的位错攀移;动态再结晶在变形温度高于200℃时发生,再结晶晶粒的晶界呈锯齿状,尺寸在2μm以下。Based on the deformation temperature and strain rate as parameters,change of microstructure and properties of rolling AT33 alloy with different deformation parameters was described,and the deformation mechanism of AT33 alloy was characterized by establishing the constitutive equation.The results show that the deformation activation energy is 145kJ/mol with the stress exponent nof 6.5,so the deformation mechanism is characterized by lattice diffusion controlled dislocation climb.Dynamic recrystallization occurs with the deformation temperature more than 200℃,and the recrystallized grain boundary shows saw tooth style with the size less than 2μm.

关 键 词：AT33合金 变形 应变速率 晶粒尺寸 组织 

分 类 号：TG659[金属学及工艺—金属切削加工及机床] TH142.3[一般工业技术—材料科学与工程]