A new orientation relationship OR4 of icosahedral phase with magnesium matrix in Mg-Zn-Y alloys

A new orientation relationship OR4 between icosahedral phase and magnesium matrix is described. In this a -type zone axis is along the matrix hexagonal axis and a fivefold axis along hexagonal < 100 >. This orientation relationship can be derived from the most commonly observed OR1 by a twinning of the icosahedral phase. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.