Title:
Surface Integrity on Grinding of Gamma Titanium Aluminide Intermetallic Compounds

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dc.contributor.advisor Danyluk, Steven
dc.contributor.author Murtagian, Gregorio Roberto en_US
dc.contributor.committeeMember Saxena, Ashok
dc.contributor.committeeMember Carlos Santamarina
dc.contributor.committeeMember McDowell, David L.
dc.contributor.committeeMember Ernst, Hugo A.
dc.contributor.committeeMember Kurfess, Thomas R.
dc.contributor.department Mechanical Engineering en_US
dc.date.accessioned 2005-07-28T18:07:00Z
dc.date.available 2005-07-28T18:07:00Z
dc.date.issued 2004-08-20 en_US
dc.description.abstract Gamma-TiAl is an ordered intermetallic compound characterized by high strength to density ratio, good oxidation resistance, and good creep properties at elevated temperatures. However, it is intrinsically brittle at room temperature. This thesis investigates the potential for the use of grinding to process TiAl into useful shapes. Grinding is far from completely understood, and many aspects of the individual mechanical interactions of the abrasive grit with the material and their effect on surface integrity are unknown. The development of new synthetic diamond superabrasives in which shape and size can be controlled raises the question of the influence of those variables on the surface integrity. The goal of this work is to better understand the fundamentals of the abrasive grit/material interaction in grinding operations. Experimental, analytical, and numerical work was done to characterize and predict the resultant deformation and surface integrity on ground lamellar gamma-TiAl. Grinding tests were carried out, by analyzing the effects of grit size and shape, workpiece speed, wheel depth of cut, and wear on the subsurface plastic deformation depth (PDD). A practical method to assess the PDD is introduced based on the measurement of the lateral material flow by 3D non-contact surface profilometry. This method combines the quantitative capabilities of the microhardness measurement with the sensitivity of Nomarski microscopy. The scope and limitations of this technique are analyzed. Mechanical properties were obtained by quasi-static and split Hopkinson bar compression tests. Residual stress plots were obtained by x-ray, and surface roughness and cracking were evaluated. The abrasive grit/material interaction was accounted by modeling the force per abrasive grit for different grinding conditions, and studying its correlation to the PDD. Numerical models of this interaction were used to analyze boundary conditions, and abrasive size effects on the PDD. An explicit 2D triple planar slip crystal plasticity model of single point scratching was used to analyze the effects of lamellae orientation, material anisotropy, and grain boundaries on the deformation. en_US
dc.description.degree Ph.D. en_US
dc.format.extent 22131435 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/6968
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Grinding en_US
dc.subject Titanium aluminide
dc.subject Intermetallic compounds
dc.subject Plastic deformation
dc.subject Residual stress
dc.subject Surface Integrity
dc.subject Crystal plasticity
dc.subject.lcsh Radio circuits Design and construction en_US
dc.title Surface Integrity on Grinding of Gamma Titanium Aluminide Intermetallic Compounds en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Danyluk, Steven
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 87cdff3a-1d95-4b3b-97f3-fa686905084b
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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