Authors: L Huang P K Liaw C T Liu
Publish Date: 2007/04/11
Volume: 38, Issue: 13, Pages: 2290-2297
Abstract
In this work new TiAl alloys containing W B and Nb have been developed Fine uniform microstructures with colony size smaller than 50 μm can be conveniently obtained after hotisostatic pressing HIP and homogenization treatment without any grainrefining processes using hot deformation The effects of tungsten and boron on the microstructure of the TiAl alloys including the colony size and lamellar spacing were analyzed This work shows that a small additional amount of W can refine the grain size of the TiAlNbWB alloys The lamellar spacing also decreases with increasing W concentration When the amount of W is greater than 04 at pct the β phase is stabilized and remains at room temperature which can degrade the ductility of the alloy Mechanical properties such as the hardness of the alloy can be increased by the addition of the alloying element through the solution strengthening and refinement of the grain sizeThis article is based on a presentation given in the symposium entitled “Deformation and Fracture from Nano to Macro A Symposium Honoring WW Gerberich’s 70th Birthday” which occurred during the TMS Annual Meeting March 1216 2006 in San Antonio Texas and was sponsored by the Mechanical Behavior of Materials and Nanomechanical Behavior Committees of TMSThe present research is sponsored by the Fossil Energy Materials Program with Drs R Judkins and J Zollar as program managers under Contract No 11XSP173V and the National Science Foundation Combined ResearchCurriculum Development CRCD Program with Ms Mary Poats as the contract monitor under Contract No EEC0203415
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