Twinning Behaviour in the Intermetallic Compound Al_(18)Cr_2Mg_3  

作　　者：Maohua Li Yanqing Yang Ming Han Wei Zhang Bin Huang Xian Luo Jigang Ru 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University [2]Beijing Institute of Aeronautical Materials

出　　处：《Acta Metallurgica Sinica(English Letters)》2014年第4期677-681,共5页金属学报（英文版）

基　　金：financially supported by the 111 Project (No.B08040) of China;National Natural Science Foundation of China (No.51071125)

摘　　要：The twinning in the intermetallic compound Al18Cr2Mg3 was observed and identified by transmission electron microscopy.The geometric description of the twinning in Al18Cr2Mg3 with 184 atoms per unit cell was investigated at atomic level.The classical theory of deformation twinning states that the net atomic displacements are divided into shear and shuffles during twinning.Based on the theory and the hypothesis of full mirror reflection symmetry,the displacement and angle of shuffle were calculated for each atom.The geometric calculation results show that all of the atoms in single crystal Al18Cr2Mg3 have to shuffle.Moreover,the calculation results can be divided into 22 groups,which do not show obvious regularity.The twinning in the intermetallic compound Al18Cr2Mg3 was observed and identified by transmission electron microscopy.The geometric description of the twinning in Al18Cr2Mg3 with 184 atoms per unit cell was investigated at atomic level.The classical theory of deformation twinning states that the net atomic displacements are divided into shear and shuffles during twinning.Based on the theory and the hypothesis of full mirror reflection symmetry,the displacement and angle of shuffle were calculated for each atom.The geometric calculation results show that all of the atoms in single crystal Al18Cr2Mg3 have to shuffle.Moreover,the calculation results can be divided into 22 groups,which do not show obvious regularity.

关 键 词：Intermetallic compound Al18Cr2Mg3 Twinning Shear Shuffle 

分 类 号：O641[理学—物理化学]