|About this Abstract
||Materials Science & Technology 2012
||Recent Advances in Phase Transformations and Structural Evolution in Titanium and its Alloys
||Correlations between the Cooling Rate and Decomposition Pathways in near Eutectoid Ti-Cu Alloys
||Rodrigo J Contieri, Eder S Lopes, Soumya Nag, Rubens Caram, Rajarshi Banerjee
|On-Site Speaker (Planned)
This paper discusses the competition among martensitic, bainitic and pearlitic transformation mechanisms as well as solute partitioning in near-eutectoid Ti-Cu samples subjected to continuous cooling. Arc-melted Ti-Cu samples were subjected to β solution heat treatment and then cooled using a modified Jominy End Quench Test apparatus. Scanning and transmission electron microscopy and atom probe tomography were employed to investigate the microstructural evolution and solute partitioning. The results obtained indicate that rapidly quenched near-eutectoid Ti-Cu alloys exhibit the coexistence of martensite/bainite plates and very fine lamellar regions between the plates. The inter-plate lamellar region consisted of phases with compositions far from equilibrium. As cooling rate decreased, the fraction of martensite/bainite plates decreased, being replaced by the pearlitic structure and the compositions of the constituent α and Ti<SUB>2</SUB>Cu phases were closer to equilibrium. No matter the cooling rate applied, no evidence of β phase stabilization was found in these alloys.
||Planned: Metallurgical and Materials Transactions