|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||Grain Refinement and Texture Evolution in Boron Containing TiAl Alloys
||Ulrike Hecht, Silja-Katharina Rittinghaus
|On-Site Speaker (Planned)
Boron additions in gamma alloys are known to promote grain refinement and mitigate the texture in cast components or ingots as well as in parts produced by additive manufacturing routes. This presentation reviews the roles of boron additions from several perspectives: 1) the thermodynamic background of boron partitioning and boride formation; 2) the crystallography of stable and metastable boride phases; 3) the role of ribbon borides (Ti,Nb)B with the crystal structure of NbB during the bcc-hcp phase transformation and their impact on grain refinement and texture evolution. Due distinction will be made between the solid-state bcc-hcp transformation and the peritectic bcc-hcp reaction/ transformation in the presence of borides; and 4) the phase transformations of borides during heat treatment. Finally and based on (i)-(iv) boride formation and grain refinement will be presented for the special case of additive layer manufacturing (LDM) both in as-build and heat treated samples from selected alloys.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)