Recrystallization of Al-5.8Mg-Mn-Sc-Zr alloy  

Al-5.8Mg-Mn-Sc-Zr合金的再结晶行为(英文)

作　　者：王迎[1] 潘清林[1,2] 宋艳芳[1] 李晨[1] 李智凤 陈琴[1] 尹志民[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第11期3235-3241,共7页中国有色金属学报（英文版）

基　　金：Project(2012CB619503)supported by the National Basic Research Program of China

摘　　要：Al-5.8Mg-0.4Mn-0.25Sc-0.1Zr （mass fraction, %） alloys were prepared by water chilling copper mould ingot metallurgy processing which was protected by active flux. The recrystallization temperature and nucleation mechanism of the alloy were studied by means of hardness tests, observations of optical microscopy and transmission electron microscopy. The results show that the anti-crystallization ability can be significantly improved by adding minor Sc and Zr into Al-Mg-Mn alloy. This can be proved by a much higher recrystalliztion temperature （450 ~C） than Al-Mg-Mn alloy without Sc and Zr （150 ℃）. The main reason of the great increase of recrystallization temperature can be attributed to the strong pinning effect of highly disperseded Al3（Sc,Zr） particles on dislocations and sub-grain boundaries. The recrystallizing process reveals itself the nucleation mechanism of the alloy involving not only the sub-grain coalescence but also the sub-grain growth.采用活性熔剂保护熔炼,水冷铜模激冷铸造技术制备了Al-5.8Mg-0.4Mn-0.25Sc-0.1Zr(质量分数,%)合金板材。通过显微硬度测试、光学显微镜和透射电镜观察等分析手段研究了该合金的再结晶温度和再结晶形核机制。结果表明:通过添加微量的Sc和Zr元素使Al-Mg-Mn合金的抗再结晶能力得到显著提高,即添加了Sc和Zr的Al-Mg-Mn合金再结晶温度(450℃)比没有添加的合金(150℃)的高。Al-Mg-Mn-Sc-Zr合金的再结晶温度较高的主要原因是细小、弥散的Al3(Sc,Zr)粒子对位错和亚晶界的钉扎作用。合金的再结晶形核机制为亚晶合并和亚晶长大的双重机制。

关 键 词：Al-Mg-Mn-Sc-Zr alloy RECRYSTALLIZATION Al3（Sc Zr） particle NUCLEATION 

分 类 号：TG146.21[一般工业技术—材料科学与工程]