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

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第9期    总第114期    2008年9月

[PDF全文下载]        

    

文章编号:1004-0609(2008)09-1584-06
AZ31B镁合金的铸轧组织及其相关变形机制
娄花芬1, 2,汪明朴1,唐 宁1,李 周1,郭明星1,雷 前1

(1. 中南大学 材料科学与工程学院,长沙 410083;
2. 中铝洛阳铜业有限公司,洛阳 471039
)

摘 要: 利用金相显微镜、透射电子显微镜对AZ31B镁合金铸轧板坯的微观组织进行研究。结果表明:铸轧AZ31B镁合金板坯主要由α-Mg基体、枝晶间Mg17Al12共晶体和弥散分布的细小析出相组成,铸轧对晶粒的细化效果不明显;板坯在铸轧过程中经历一定的塑性变形,且变形多分布于板材表层;塑性变形在合金中产生大量的位错及位错胞的同时,也产生一定数量的孪晶;经孪生改变晶体取向后的晶粒会在适合的条件下发生滑移变形,孪生和滑移的协同作用使孪晶和位错共存、孪晶中位错的产生和孪晶的变形;铸轧时的塑性变形和高温还导致回复和再结晶的发生。

 

关键字: AZ31B合金;双辊铸轧;孪生;位错滑移

Microstructures of twin-roll cast AZ31B Mg alloy and its deformation mechanism
LOU Hua-fen1, 2, WANG Ming-pu1, TANG Ning1, LI Zhou1, GUO Ming-xing1, LEI Qian1

1. School of Materials Science and Engineering, Central South University, Changsha 410083,China;
2. Chinalco Luoyang Copper Co. Ltd, Luoyang 471039, China

Abstract:The microstructures of AZ31B magnesium alloy twin-roll cast sheet were studied by metallographic microscope and TEM. The results show that the sheet is made up of α-Mg matrix, interdendritic Mg17Al12 eutectic and some dispersive fine precipitates. Sheet undergoes biggish plastic deformation, and the deformation distributes more near sheet surface than interior. A mass of dislocations and dislocation cells form during plastic deformation while some twins form simultaneously. After twining, the grain orientations change, and then they will slip on suitable condition. This process leads the formation of dislocations in twins and deformation of twins. The recovery and recrystallization reduce during twin-roll casting because of the plastic deformation and high temperature.

 

Key words: AZ31B alloy; twin-roll cast; twins; dislocations slipping

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

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

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com