冶金质量对Al-Mn-Mg合金动态再结晶行为的影响  

The effect of metallurgical quality on dynamic recrystallization of Al-Mn-Mg alloy

作　　者：王火生[1,2] 傅高升[1] 陈永禄[2] 陈文哲[1,2] 

机构地区：[1]福州大学材料科学与工程学院,福建福州350116 [2]福建工程学院材料科学与工程学院,福建福州350118

出　　处：《福州大学学报（自然科学版）》2014年第3期463-467,共5页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省自然科学基金资助项目(E0610004;2012J01193);福建省教育厅A类科技资助项目(JA08163)

摘　　要：采用TEM和EDS等技术分析经高效铝熔体处理和均匀化退火后的Al-Mn-Mg合金中夹杂物和第二相形态与组成,并通过动态热模拟试验研究夹杂物和第二相对该铝材热变形过程中动态再结晶行为的影响.结果表明,经高效熔体处理后,该合金中Al2O3夹杂物较细小,经均匀化退火后,铸态条件下骨骼状β-Al6(Mn,Fe)相变成短棒状和球状α-Al(Mn,Fe)Si相,并在晶内析出弥散α-Al(Mn,Fe)Si相;在随后的热变形过程中,细小夹杂物和第二相阻碍位错运动,形成位错缠结,可以积蓄足够能量,促进动态再结晶进行,形成以夹杂物和第二相为核心的低位错密度晶粒.The morphology and constitution of inclusions and second - phases of A1 - Mn - Mg alloy,which was prepared by high - efficient aluminum melt - treatment and homogenizing annealing, wereanalyzed by TEM and EDS. The influences of inclusion and second - phases on the dynamic recrystal-lization during thermal deformation were studied by dynamic thermal/mechanical simulation technique.The results showed that the inclusion size of A12 03 was small after high - efficient melt - treatment.The skeletony as - cast phase/3 - A16 （ Mn, Fe） transform to sphere phase a - A1 （ Mn, Fe） Si, and agreat deal of dispersive a -A1 （Mn, Fe）Si phase precipitated in grains after homogenizing annealing,so the metallurgical quality was improved. Small size inclusions and second - phases prevented thedislocation movement and caused dislocation tangle, which helped to store enough energy to facilitatedynamic recrystallization, As a result, low dislocation density grain formed around the small size inclu-sion and secondphases.

关 键 词：Al-Mn-Mg合金 夹杂物 第二相 热变形 动态再结晶 

分 类 号：TG111.7[金属学及工艺—物理冶金]