Short and Medium-Range Order in Liquid Ternary Al80Co10Ni10, Al72.5Co14.5Ni13, and Al65Co17.5Ni17.5 Alloys

作者：Roik Oleksandr S^*; Samsonnikov Oleksiy; Kazimirov Volodymyr; Sokolskii Volodymyr

来源：Zeitschrift fur Naturforschung Section A-A Journal of Physical Sciences, 2010, 65(1-2): 123-131.

• High-Temperature Alloys
• Atomic Scale Structure
• X-Ray Diffraction
• Computer Simulations
• Prepeak

A local short-to-intermediate range order of liquid Al80Co10Ni10, Al72.5Co14.5Ni13, and Al65Co17.5Ni17.5 alloys was examined by X-ray diffraction and the reverse Monte Carlo modelling. The comprehensive analysis of three-dimensional models of the liquid ternary alloys was performed by means of the Voronoi-Delatinay method. The existence of a prepeak on the S(Q) function of the liquid alloys is caused by medium range ordering of 3d-transition metal atoms in dense-packed poly-tetrahedral clusters at temperatures close to the liquidus. The non-crystalline clusters, represented by aggregates of pentagons that consist of good tetrahedra, and chemical short-range order lead to the formation of the medium range order in the liquid binary Al-Ni, Al-Co and ternary Al-Ni-Co alloys.

• 出版日期2010-2