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(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 24    No. 12    December 2014

[PDF Download]        

    

Grain refinement of magnesium alloys processed by severe plastic deformation
Yong-jun CHEN1,2,3, Qu-dong WANG1, Jin-bao LIN4, Man-ping LIU5, Jarle HJELEN2, Hans J. ROVEN2,6

1. National Engineering Research Center of Light Alloy Net Forming,
Shanghai Jiao Tong University, Shanghai 200030, China;
2. Department of Materials Science and Engineering, Norwegian University of Science and Technology,
Trondheim 7491, Norway;
3. ERC for Revolutionizing Metallic Biomaterials, North Carolina A&T State University,
Greensboro, NC 27411, USA;
4. School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China;
5. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
6. Center for Advanced Materials, Qatar University, Doha POB 2713, Qatar

Abstract:Grain refinement of AZ31 Mg alloy during cyclic extrusion compression (CEC) at 225-400 °C was investigated quantitatively by electron backscattering diffraction (EBSD). Results show that an ultrafine grained microstructure of AZ31 alloy is obtained only after 3 passes of CEC at 225 °C. The mean misorientation and the fraction of high angle grain boundaries (HAGBs) increase gradually by lowering extrusion temperature. Only a small fraction of twinning is observed by EBSD in AZ31 Mg alloys after 3 passes of CEC. Schmid factors calculation shows that the most active slip system is pyramidal slip and basal slip {0001} at 225-350 °C and 400 °C, respectively. Direct evidences at subgrain boundaries support the occurrence of continuous dynamic recrystallization (CDRX) mechanism in grain refinement of AZ31 Mg alloy processed by CEC.

 

Key words: magnesium alloys; grain refinement; continuous dynamic recrystallization (CDRX); electron backscattering diffraction (EBSD); cyclic extrusion compression (CEC)

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