Ta4AlC3: Phase determination, polymorphism and deformation
2007 (English)In: Acta Materialia, ISSN 1359-6454, Vol. 55, no 14, 4723-4729 p.Article in journal (Refereed) Published
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. © 2007.
Place, publisher, year, edition, pages
2007. Vol. 55, no 14, 4723-4729 p.
IdentifiersURN: urn:nbn:se:liu:diva-38296DOI: 10.1016/j.actamat.2007.04.040Local ID: 43606OAI: oai:DiVA.org:liu-38296DiVA: diva2:259145