欢迎登录材料期刊网

材料期刊网

高级检索

测量Al,Si,Ti,Cr,Nb等纯元素以及Ti50Al50,Ti50l48Cr2,Ti50Al48Nb2合金的符合正电子湮没辐射多普勒展宽谱和寿命谱,获得金属及合金中d电子和缺陷的信息.结果表明,二元TiAl合金的电子密度和3d电子的信号较低,晶界缺陷的开空间较大.在TiAl合金中加入Cr或Nb,合金中的d-d电子作用增强,基体和晶界处的电子密度均增加.Ti50Al48Cr2合金的多普勒展宽谱的d电子信号高于Ti50Al48Nb2合金.讨论了Cr和Nb对TiAl合金中缺陷和d-d电子相互作用的影响.

参考文献

[1] Westbrook J H;Fleisher R L.Intermetallic Compounds:Principles and Practice[M].New York:John Wiley and Sons,Inc,1995:73.
[2] Huang S C;Hall E L .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1991,22(02):427.
[3] Huang S C;Hall E L .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1991,22(11):2619.
[4] J. Y. Jung .Growth kinetics of discontinuous coarsening of lamellar structure in Ti-44at%Al(-0.5at%Cr)intermetallic compounds[J].Acta materialia,1998(12):4123-4130.
[5] Huang S C;Hall E L .[J].Acta Metallurgica Et Materialia,1991,39(06):1053.
[6] Hanamura T;Uemori R;Tanino M .[J].Journal of Materials Research,1988,3(04):656.
[7] T. T. Cheng .The decomposition of the beta phase in Ti-44Al-8Nb and Ti-44Al-4Nb-4Zr-0.2Si alloys[J].Acta materialia,1998(13):4801-4810.
[8] Paul J D H;Appel F;Wagner R .[J].Acta Materialia,1998,46(04):1075.
[9] 邓文,祝莹莹,周银娥,黄宇阳,曹名洲,熊良钺.掺V和Ag的TiAl合金中缺陷和电子密度的正电子湮没研究[J].稀有金属材料与工程,2006(03):348-351.
[10] Morinaga M;Saito J;Yukawa N et al.[J].Acts Metall Mater,1990,38(01):25.
[11] West R N .[J].Advances in Physics,1973,22(03):263.
[12] Lynn K G;MacDonald J R;Boie R A et al.[J].Physical Review Letters,1977,38(05):241.
[13] Alatalo M;Kauppinen H;Saarinen K et al.[J].Phys Roy B,1995,51(07):4176.
[14] 邓文;祝莹莹 et al.[J].稀有金属材料与工程,2004,33(Supp1.2):125.
[15] Deng Wen;Huang Y Y;Brusa R S et al.[J].Journal of Alloys and Compounds,2006,421:228.
[16] Szpala S.;Nielsen B.;Peng JP.;Hayakawa S.;Lynn KG. Gossmann HJ.;Asokakumar P. .DEFECT IDENTIFICATION USING THE CORE-ELECTRON CONTRIBUTION IN DOPPLER-BROADENING SPECTROSCOPY OF POSITRON-ANNIHILATION RADIATION[J].Physical Review.B.Condensed Matter,1996(7):4722-4731.
[17] Brusa R S;Deng W;Karwasz G P et al.[J].Nuclear Instruments and Methods Section B,2002,194:519.
[18] Ghosh V J;Alatalo M;Asoka-Kumar P et al.[J].Physical Review B:Condensed Matter,2000,61(15):10 092.
[19] Kirkeganrd P .[J].Computer Physics Communications,1974,7(07):401.
[20] Brandt W;Paulin R .[J].Physical Review B:Condensed Matter,1972,5(07):2430.
[21] Brandt W;Reinheimer J .[J].Physical Review B:Condensed Matter,1970,2(08):3104.
[22] Brandt W;Dupasquier A.Positron Solid-State Physics[M].Amsterdam:Holland Publish Co,1983:200.
[23] Dorikens-Vanpraet L;Dorikens M;Seeger D.Positron Annihilation[M].Singapore:World Scientific Publishing Co.Ptc.Ltd,1988:275.
[24] Vitek V;Kruisman J J;Hosson J.Th M De[A].Nevada:Reno,1988:139.
[25] Deng Wen;Xiong L Y;Wang S H .[J].Journal of Materials Science Letters,1994,13:313.
[26] K. Ito .An atomistic study of segregation to lamellar interfaces in non-stoichiometric TiAl alloys[J].Acta materialia,1998(15):5435-5446.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%