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通过基于密度泛函理论(DFT)的第-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层呈完全镜面对称挛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.

参考文献

[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.Science,2003;300:1275
[9] Liu M,Roven H J,Murashkin M,Valiev R Z.Mater Sci Forum,2008;579:147
[10] Zhang J M,Xie L J,Xu K W.Acta Metall Sin,2007;43:182(张建民,解丽娟,徐可为.金属学报,2007;43:182)
[11] Wu X Z,Wang R,Wang S F,Wei Q Y.Appl Surf Sci,2010;256:6345
[12] Wu J,Wen L,Tang B Y,Peng L M,Ding W J.Solid State Sci,2011;13:120
[13] Heino P,Perondi L,Kaski K,Ristolainen E.Phys Rev,1999;60B:14625
[14] Schulthess T C,Turchi P E A,Gonis A,Nieh T G.Acta Mater,1998;46:2215
[15] Kohn W,Sham L.Phys Rev,1965;140:A1133
[16] Milman V,Winkler B,White J A,Pickard C J,Payne M C,Akhmatskaya E V,Nobes R H.Int J Quant Chem,2000;77:895
[17] Segall M D,Lindan P J D,Probert M J,Pickard C J,Hasnip P J,Clark S J,Payne M C.J Phys,2002;14:2717
[18] Mattsson A E,Schultz P A,Desjarlais M P,Mattsson T R,Leung K.Model Simul Mater Sci Eng,2005;13:R1
[19] Payne M C,Teter M P,Allan D C,Arials T A,Joannopoulos J D.Rev Mod Phys,1992;64:1045
[20] Perdew J P,Chevary J A,Vosko S H,Jackson K A,Perderson M R,Singh D J,Fiolhais C.Phys Rev,1992;46B:6671
[21] Meyer R,Lewis L J.Phys Rev,2002;66B:052106
[22] Hirth J P,Lothe J.Theory of Dislocations.2nd Ed.,New York:Wiley,1982:839
[23] Baskes M I.Phys Rev,1992;46B:2727
[24] Ogata S,Li J,Yip S.Science,2002;298:807
[25] Hartford J,Von Sydow B,Wahnstr(o)m G,Lundqvist B I.Phys Rev,1998;58B:2487
[26] Wang Y F,Zhang W B,Wang Z Z,Deng Y H,Yu N,Tang B Y,Zeng X Q,Ding W J.Comput Mater Sci,2007;41:78
[27] Zhang C L,Han P D,Yan X,Wang C,Xia L Q,Xu B S.J Phys,2009;42D:125403
[28] Mola R,Dziado(n) A.Arch Foundry Eng,2008;8:127
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