Microstructure and tensile properties of （显微组织和拉伸性能）.pdfVIP

Journal of Alloys and Compounds 402 (2005) 162–169 Microstructure and tensile properties of Ti6Al4V/AM60B magnesium matrix composite H.Z. Ye, X.Y. Liu ∗ Integrated Manufacturing Technologies Institute, National Research Council of Canada, London, ON, Canada N6G 4X8 Received 8 January 2005; received in revised form 24 April 2005; accepted 26 April 2005 Available online 14 July 2005 Abstract The low density of magnesium alloys makes them attractive for aerospace and automotive applications. In order to further improve the high temperature strength of the magnesium alloys, Ti6Al4V particles were added to an AM60B magnesium alloy to form a composite through melting and hot isostatic pressing. Increasing the Ti6Al4V content from 0 to 5 vol.%, however, produced no beneficial effect on tensile strengths at room temperature, but reduced the ductility. The pores existing between the matrix and Ti6Al4V particles in the as cast conditions, along with the segregation of Mn5Al8 intermetallic particles at the Ti6Al4V/matrix interface are believed to be responsible for the changes in mechanical properties. Crown Copyright © 2005 Published by Elsevier B.V. All rights reserved. Keywords: Metal matrix composite; Intermetallics; Casting; Segregation; Tensile properties 1. Introduction composites. Recent studies have explored the effect of some metallic reinforcements such as Ni [2], Cu [3] and Ti [4] Magnesium alloys have been attracting an increased inter- particulates in a magnesium matrix. It was reported t