Ta4AlC3:: Phase determination, polymorphism and deformation

被引:73
作者
Eklund, P. [1 ]
Palmquist, J.-P.
Hoewing, J.
Trinh, D. H.
El-Raghy, T.
Hoegberg, H.
Hultman, L.
机构
[1] Linkoping Univ, Dept Phys Chem & Biol, IFM, Thin Film Phys Div, S-58183 Linkoping, Sweden
[2] Kanthal AB, R&D Heating Syst, S-73427 Hallstahammar, Sweden
[3] Inst Energy Technol, Dept Phys, N-2007 Kjeller, Norway
[4] 3 ONE 2, Voorhees, NJ USA
关键词
carbides; X-ray diffraction (XRD); transmission electron microscopy (TEM); Rietveld refinement;
D O I
10.1016/j.actamat.2007.04.040
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ta4AlC3, a new member of the M(n+1)AX(n)-phase family, has been synthesized and characterized (n = 1-3; M = early transition metal; A = A-group element; and X = C and/or N). Phase determination by Rietveld refinement of synchrotron X-ray diffraction data shows that Ta4AlC3 belongs to the P6(3)/mmc space group with a and c lattice parameters of 3.10884 +/- 0.00004 angstrom and 24.0776 +/- 0.0004 angstrom, respectively. This is shown to be the alpha-polymorph of Ta4AlC3, with the same structure as Ti4AlN3. Lattice imaging by high-resolution transmission electron microscopy demonstrates the characteristic MAX-phase stacking of alpha-Ta4AlC3. Three modes of mechanical deformation of alpha-Ta4AlC3 are observed: lattice bending, kinking and delamination. (c) 2007 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
引用
收藏
页码:4723 / 4729
页数:7
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