镁合金温变形过程中的孪生及孪晶交叉.pdf

45 11 2009 11 1303—1308 ACTA METALLURGICA SINICA Nov. 2009 –1308 ? 1 , 2) 1) 1) , 410083 2) , 410083 AZ31 3 (523, 573 673 K) . 523 K, ε –, ( ≤ε< 0 . 06) ( ≤ε< 0 . 22)2 . SEM/EBSD 2 . , ( ε=), ; ( ε=), { 10 12 } , . AZ31 { 10 12 } 5 , . ? 11 20 ?? 10 10 ?(10 12)–(01 12) (10 12)–(0 112)2 . , , , , A 0412 ? 1961(2009)11 ? 1303 ? 06 TWINNING AND TWIN INTERSECTION IN AZ31 Mg ALLOY DURING WARM DEFORMATION YANG Xuyue 1 , 2), ZHANG Lei 1) 1) School of Materials Science and Engineering, Central South University, Changsha 410083 2) Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083 Correspondent: YANG Xuyue, professor, Tel: (0731)8830136 , E-mail: ******@. Manuscript received 2009–05–05, in revised form 2009–08–18 ABSTRACT Though electron backscattering di?raction (EBSD) is widely employed for the ori- entation analysis of deformed microstructures in many metallic materials, its applications to Mg and its alloys are not widespread because of the di?culties involved in sample preparation. In this work, pression tests were performed on samples cut along the extrusion direction from AZ31 Mg alloy bars, and then the twins and their intersections were analyzed by SEM/EBSD microscopy. Deformation and deformation mechanisms operating in Mg alloy depen