Pramanick , A K and Mandal, R K and Sastry, G V S (2004) Structural stability of Al-Co-Cu-Ni decagonal phase. Journal of Non-Crystalline Solids, 334-335 . pp. 234-237.
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Structural stability with respect to heat treatments of the Al-Co-Cu-Ni decagonal phase has been explored. Deca-gonal phases are stabilized in Al-Co-Cu-Ni alloys with Al(,;CoicCu,)) and Ah5)Coj, Nii5 as ternary end members. Characteristic features of this alloy series have been reported earlier. Both in the as-cast and rapidly soli-dified condition they form decagonal phases. From a knowledge of the differential thermal analysis plots of the alloys, and on the basis of earlier studies, two compositions A16.h5- Co1. Cu5, i:NijO and Al67Co15Cu5Nii() were selected. Samples were annealed at 900 °C for 435 h for the as-cast alloy of the former composition and at 450 °C for 65 h for the rapidly solidified alloy of the latter one. Only for the latter composition, were samples ion milled prior to TEM investigations. In both samples, we observed a lowering of symmetry in the 10-fold diffraction patterns with annealing.
|Uncontrolled Keywords:||Thermal alloys; structural stability; electron diffraction patterns|
|Divisions:||Material Science and Technology|
|Deposited By:||Sahu A K|
|Deposited On:||02 Jul 2012 16:53|
|Last Modified:||02 Jul 2012 16:53|
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