ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Ti-6242 alloys have been widely used in aero-engine applications due to high temperaturestrength and creep resistance. The γ-TiAl based intermetallics are considered as candidate materials toreplace the current materials weed at high temperatures. The present paper reports on themicrostructural and mechanical characterization of γ-TiA/Ti6242 diffusion bonds. The emphasis isput on the better understanding of microstructural development during diffusion process andmechanical properties of diffusion bonds. The process variables of temperature, pressure and timewere optimized to produce joints with sound microstructure and bond quality for mechanicalcharacterization. The micro and standard tensile tests were applied to determine bonding strength ofjoints. Metallographic and fractographic examinations on diffusion joints and tested specimens werecarried out using SEM coupled with EDX. The concentration profiles of elements from EDX analysiscombined with SEM/BSE investigation demonstrated that the strong inter-diffusion of main elementsAl and Ti across the bonding interface occurred during DB process leading to the formation of anoticeable diffusion zone consisting of fine* α2/α grains. The micro tensile tests showed that thepreference of fracture on base materials far from the bonding line, but a more marked tendency tobrittle failure along bonding interface shown by the standard tensile test results, indicating asignificant sample size effect on mechanical property measurements
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1393.pdf
