特殊成形工藝下AZ31鎂合金的織構(gòu)及變形機(jī)制_圖文

1、451Vol.45No.1200915862ACTA METALLURGICA SINICA Jan. 2009pp.5862 AZ3111222111,1000832,410082AZ31,0001.:, ;122.5,., AZ31TG146.2, TG111.7A0412 1961(200901 0058 05TEXTURES AND DEFORMATION MECHANISMS OFAZ31MAGNESIUM ALLOYS UNDER SPECIAL PROCESSING TECHNOLOGIESWANG Lina 1 , YANG Ping 1, XIA Weijun2, CHEN

2、Zhenhua2, CHEN Ding2, LI Xiao1,MENG Li 11 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 1000832 School of Materials Science and Engineering, Hunan University, Changsha 410082Correspondent:YANG Ping, professor, Tel:(01082376968, E-mail:yangpSupport

3、ed by National Natural Science Foundation of China (No.50571009 and State Key Laboratoryfor Advanced Metals and Materials of University of Science and Technology Beijing (No.2007AMM006Manuscript received 20080417, in revised form 20080723ABSTRACT The modications of basal texture in AZ31magnesium all

4、oys processed by asym-metrical rolling and equal channel angular rolling (ECARare investigated. Deformation mechanisms are determined by microstructure observation and macro and microtexture measurements. Results show that during asymmetrical rolling the basal texture is gradually rotated around TD

5、(transversedirection by basal slip activated by shear strain on the rolling plane, whereas the prism texture is induced by tension twinning activated by shearing parallel to the plane separating the two channels during ECAR. So both the special processing techniques may improve the plasticity of mag

6、nesium alloy. The eects of rolling reduction and annealing on textures are also studied and discussed. KEY WORDS asymmetrical rolling, equal channel angular rolling, texture, twinning, AZ31magnesium alloy,*505710092007AMM006:20080417,:20080723:, 1982,15%.,1 45 89 11,.,.51:AZ315911,.(,5,911,(EBSD.1AZ

7、31.(:Al 3%,Zn 1%,Mg.,120mm , 10mm ,3004501.41.8mm,20%;,.10%;,1.05,10%,(5%,10%20%;115 , 2mm,400.25,911.Siemens D5000X,24mm ×14mm; Zeiss Supra 55HKLEBSD ,; EBSD,ACII,20V,60s.22.11AZ31.1a, b ,(12,13.(10%,13.(1c.(1e,;(1f.2.223(X 70, 70,000110¯10,(,.,(2a, b. 1AZ31 Fig.1Microstructures of AZ31ma

8、gnesium alloy samples under dierent rolling techniques(a,(b10%reduction per pass, mainly compression twins(clenslike tension twins as shown as arrows and compression twins, about 0.6true strain per pass(dannealing 1h at 300(eannealing 1h at 450, small grains formed from deformation twins shown by ar

9、row(fannealing 1h at 3006045 2Fig.2Textures of samples during dierent rolling technolo-gies(a,(bconventional rolling, 10%reduction per pass, max. intensity 10/2(c,(dasymmetrical rolling, 10%reduction per pass, max. intensity 6/2(e,(fannealing after asymmetrical rolling, max. in-tensity 2/2(g,(hequal

10、 channel angular rolling, about 0.60true strain, max. intensity 6/4(i,(jannealing after equal channel angular rolling, max. intensity 4/2, ,10¯11(. TD , (2c, d., ., (2e, f.(2g, h. , , . (2i, j.3400(5%,10%20%., . , , , . 2.30001, . 4a EBSD (, 0001/,10¯10/, 11¯20/, 15 ; 15 , 10 , 5 ,3 ,

11、 86 11¯20 , 56 11¯20 , 37 11¯20 ., , , 010 (4c,( . , 37 11¯20 , 12, 13. , AZ31. , ., , , 5a(4a. , 86 11¯20 23.2%;(0001/ 31.8%;( 10¯10/ 17.3%,; 11¯20/12.3%,. , ,. ,. ( 5c. , ,.1:AZ3161 3Fig.3Inuence of strain on macrotexture of 0001basal texture under asymmetrical r

12、olling at 400(arolling reduction per pass:5%,max. intensity 6(brolling reduction per pass:10%,max. intensity 16(crolling reduction per pass:20%,max. intensity14 4Fig.4Orientation imaging analysis of sample under conventional rolling (10%reduction per pass(aorientation map (greycolorbasal oriented gr

13、ains; blue color 10¯10/rolling plane, redcolor 11¯20/rolling plane; black thick line >15 misorientation, black thin line >10 misorientation; red line >5 misorientation, blue line >3 misorientation, pur-ple line86 11¯20 tension twins, green lines56 11¯20 compression tw

14、ins, thick red lines37 11¯20 double twins(b0001pole gure (greypointsbasal orientations, blue points 10¯10, red points11¯20(cdistribution ofmisorientation 5Fig.5Orientation imaging analysis of the sample under equal channel angular rolling (truestrain about 0.6(aorientation map (b0001p

15、ole gure (cdistribution of misorientation,.32:,;(,.,.63.,6245 6Fig.6Stress analysis of samples under dierent rolling technologies(aconventional rolling (basymmetrical rolling (cequal channel angular rolling(6a.,. , . , , (6b, 6, 7., ; ,. , 12, 13,(6c,c ,. , , .,. 14, 68, . ,1, 4, , , .,.( , ,.4(1. ,

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