The Characterization of Reinforced TiAl Intermetallic with Dispersed Cr Particles Consolidated by HIP

Abstract

A Chromium (Cr) containing TiAl intermetallic has been consolidated by Hot Isostatic Pressing (HIP) process using high purity TiAl pre-alloyed powder as original material. Cr has been selected as an element which improves high temperature mechanical properties of HIPed TiAl intermetallic compound. Cr additions in TiAl powder were changed systematically and microstructure and mechanical properties at elevated temperatures were examined. This study determined the densification behavior of Cr containing TiAl intermetallic powder during HIP process conducted at 1273 K under the pressure of 200 MPa. Microstructure of consolidated TiAl + xCr as well as high temperature mechanical properties are presented. Improvement of high temperature tensile strength of as-HIPed TiAl compound was achieved by the effect of Cr particles dispersion and reactive zone formation between Cr particles and TiAl matrix. From these results, it was concluded that tensile strength of HIPed TiAl-5Cr becomes 1.2-1.5 times high than that of HIPed and MIMed TiAl and machinability of TiAl at R.T. also was improved by high elongation of HIPing and Cr addition.

Determination of the Young Modulus of Ti-TiAl3Metallic Intermetallic Laminate Composites by Nano-Indentation

“…In this * corresponding author; e-mail: tcerezci@sakarya.edu.tr case very large crack bridging ligaments can be formed, which stabilize the crack [5][6][7][8][9]. Specifically, the titaniumtitanium tri-aluminide (Ti-TiAl 3 ) metallic-intermetallic laminate (MIL) composite system has great potential for structural applications because of its combination of high strength, toughness and stiffness at a lower density than monolithic titanium or other laminate systems [10][11][12][13]. In the Ti-Al system there are various possible aluminides.…”