金属学报  2011, Vol. 47 Issue (5): 573-577    DOI: 10.3724/SP.J.1037.2010.00715

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Al-Mg合金中层错和孪晶形变能的第一性原理研究

董明慧, 韩培德, 张彩丽, 杨艳青, 张莉莉, 李洪飞

1) 太原理工大学材料科学与工程学院, 太原 030024 2) 太原理工大学新材料界面科学与工程教育部重点实验室, 太原 030024

FIRST-PRINCIPLES STUDY OF STACKING FAULT ENERGY AND DEFORMATION TWIN\par ENERGY IN Al-Mg ALLOYS

DONG Minghui, HAN Peide, ZHANG Caili, YANG Yanqing, ZHANG Lili, LI Hongfei

1) College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024 2) Key Laboratory of Interface Science and Engineering in Advanced Materials of Taiyuai University of Technology, Ministry of Education, Taiyuan 030024

董明慧 韩培德 张彩丽 杨艳青 张莉莉 李洪飞. Al-Mg合金中层错和孪晶形变能的第一性原理研究[J]. 金属学报, 2011, 47(5): 573-577.
, , , , , . FIRST-PRINCIPLES STUDY OF STACKING FAULT ENERGY AND DEFORMATION TWIN\par ENERGY IN Al-Mg ALLOYS[J]. Acta Metall Sin, 2011, 47(5): 573-577.

摘要 参考文献 相关文章 Metrics 全文: PDF(869 KB)   摘要: 通过基于密度泛函理论(DFT)的第一性原理计算了纯金属 Al和Al-Mg合金在(111)[112]滑移系的层错能和孪晶形变能, 分析了Mg含量、占位对层错能和孪晶形变能的影响. 计算选用了局域密度近似(LDA)和广义梯度近似 (GGA-PW91)2种近似方法, 发现GGA-PW91所获得的层错能与实验结果符合较好. 研究结果表明, 纯Al的层错能高于孪晶形变能, 随着孪晶层厚度的增加孪晶形变能略有提高, 6层呈完全镜面对称孪晶具有的孪晶形变能最低; Mg含量增加可使Al-Mg合金的层错能、变形孪晶形变能明显降低; Mg在Al-Mg合金中占位对结合能和形成热的影响很小, 当Mg处于层错层时略使层错能和孪晶形变能提高. 关键词 ： 第一性原理,  层错能,  孪晶,  Al-Mg合金     Abstract：By using first--principles method based on the density functional theory (DFT), the stacking fault energy (SFE) and deformation twin energy (DTE) for the (111)[112] slip system of pure Al metal and Al-Mg alloys were investigated. The dependence of these SFE and DTE on solid--solution Mg content and its accupation were specifically analyzed. Two major approximations were made in the process of calculation, which were local density approximation (LDA) and generalized gradient approximation (GGA-PW91), respectively. The calculated SFE values by using GGA-PW91 exhibit an excellent agreement with corresponding experimental measurements. For pure Al metal, the calculated SFE values are greater than those of DTE. Moreover, it is found that under the same deformation conditions, the DTE in pure Al and Al-Mg alloys increase monotonically with the increase of deformation twin thickness. In addition, the calculated results shows that 6-layer twin possesses the lowest DTE, which is probably due to its mirror symmetry structure. Also noteworthy, our calculations reveal a noticeable decreased tendency of SFE and DTE with Mg content increasing, while Mg occupying on stacking fault and twin boundary most likely increases SFE and DTE. There are no considerably detected effects of Mg atomic occupancy variation in Al-Mg alloy on its cohesive energy and formation energy. Key words： first-principles    stacking fault energy    twin    Al-Mg alloy 收稿日期: 2010-10-15      ZTFLH:  TG111.2   基金资助: 国家自然科学基金项目50874079和51002102, 太原市科技局大学生创新基金项目100115105及山西省教育厅基金项目20080010资助 作者简介: 董明慧, 男, 1984年生, 硕士生 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 董明慧 韩培德 张彩丽 杨艳青 张莉莉 李洪飞 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2010.00715      或      https://www.ams.org.cn/CN/Y2011/V47/I5/573 [1] Fanourgakis G S, Pontikis V, Zerah G. Phys Rev, 2003; 67B: 094102 [2] Gang L, Kioussis N, Bulatov V V, Kaxiras E. Phys Rev, 2000; 62B: 3099 [3] Rester M, Motz C, Pippan R. Scr Mater, 2008; 58: 187 [4] Zhu Y T, Narayan J, Hirth J P, Mahajan S, Wu X L, Liao X Z. Acta Mater, 2009; 57: 3763 [5] Zhao Y H, Zhu Y T, Liao X Z, Horita Z, Langdon T G. Appl Phys Lett, 2006; 89: 121906 [6] Yamakov V, Wolf D, Phillpot S R. Acta Mater, 2002; 50: 5005 [7] Hai S, Tadmor E B. Acta Mater, 2003; 51: 117 [8] Chen M W, Ma E, Hemker K J, Sheng H W, Wang Y M, Cheng X M. 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