Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第27卷    第12期    总第225期    2017年12月

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文章编号:1004-0609(2017)-12-2460-07
AA3003铸轧铝合金的等温析出动力学
陈 冠1,杨荣凯1,唐建国2,廖志宇3

(1. 南瑞集团有限公司(国网电力科学研究院有限公司),南京 211000; 2. 中南大学 材料科学与工程学院,长沙 410083; 3. 广西南南铝箔有限责任公司,南宁 530031)

摘 要: 在不同退火温度下研究AA3003铸轧铝合金的等温析出动力学,通过电导率的变化计算出该合金在不同退火时刻的析出分数,利用JMAK方程拟合并分析不同退火温度及冷轧变形量下的析出动力学;通过显微硬度和透射电镜的观察进一步研究析出与显微组织的关系。结果表明:扩散是析出过程的控制因素;冷轧变形会加快析出速率和降低鼻尖温度,但再结晶的发生削弱这种作用,并且再结晶使随后析出粒子形核的位置发生改变,导致JMAK模型中的反应级数n偏小。

 

关键词: AA3003铝合金;冷轧;等温退火;再结晶;析出动力学

Isothermal precipitation kinetics of AA3003 cast rolling aluminium alloy
CHEN Guan1, YANG Rong-kai1, TANG Jian-guo2, LIAO Zhi-yu3

1. State Grid Electric Power Research Institute, Nari Group Corporation, Nanjing 211000, China; 2. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 3. Guangxi Alnan Aluminum Foil Co., Ltd., Nanning 530031, China

Abstract:The isothermal precipitation kinetics of AA3003 cast rolling aluminium alloy were investigated at different annealing temperatures. The precipitation fractions were calculated by conductivity changes, and the precipitation kinetics were fitted and analyzed by using the JMAK model at different temperatures and cold rolling reductions. The interactions between precipitation and microstructures were studied further by microhardness and transmission electron microscopy. The results show that the diffusion is the main governing factor of precipitation. The cold rolling enhances the rate of precipitation and lowers the nose temperatures, but the recrystallization weakens this effect and changes the nucleation sites of precipitates, which causes the reaction order n of JMAK model to slant small.

 

Key words: AA3003 aluminium alloy; cold rolling; isothermal annealing; recrystallization; precipitation kinetic

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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