| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1449979 | Acta Materialia | 2007 | 7 Pages |
Abstract
Ta4AlC3, a new member of the Mn+1AXn-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 P63/mmc space group with a and c lattice parameters of 3.10884 ± 0.00004 Å and 24.0776 ± 0.0004 Å, respectively. This is shown to be the α-polymorph of Ta4AlC3, with the same structure as Ti4AlN3. Lattice imaging by high-resolution transmission electron microscopy demonstrates the characteristic MAX-phase stacking of α-Ta4AlC3. Three modes of mechanical deformation of α-Ta4AlC3 are observed: lattice bending, kinking and delamination.
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Authors
P. Eklund, J.-P. Palmquist, J. Höwing, D.H. Trinh, T. El-Raghy, H. Högberg, L. Hultman,