The microstructure, creep, and hardness properties of powder metallurgy beta gamma TiAl-4Nb-3Mn alloy

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DOIResolve DOI: http://doi.org/10.4028/www.scientific.net/MSF.706-709.1100
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TypeArticle
Proceedings titleMaterials Science Forum
Conference7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011, 1 August 2011 through 5 August 2011, Quebec City, QC
ISSN0255-5476
ISBN9783037853030
Volume706-709
Pages11001105; # of pages: 6
SubjectAging heat treatment; Aging time; Beta-phase; Colony boundary; Colony size; Constant loads; Creep properties; Fine microstructure; Fully lamellar; Gamma-titanium aluminide; Hardness test; Hardness values; Heat treatment conditions; Interfacial precipitation; Lamellar interfaces; Lamellar spacing; Microstructural features; Nominal composition; Room temperature; Tensile creep; Titanium aluminide; Titanium aluminides; Cerium alloys; Creep; Grain growth; Hardness; Hot isostatic pressing; Manganese; Microstructural evolution; Niobium; Phase interfaces; Powder metallurgy; Sintering; Titanium; Titanium alloys; Titanium compounds; Creep resistance; Heat treatment
AbstractPre-alloyed beta gamma titanium aluminide powder with a nominal composition of TiAl-4Nb-3Mn is consolidated by hot isostatic pressing. After consolidation, a step cooled heat treatment is performed to homogenize the material and produce a fully lamellar microstructure. Various aging heat treatments are then performed with the goal of forming interfacial beta phase precipitates along lamellar interfaces. The step cooled heat treatment produces a relatively fine microstructure with a lamellar spacing of 0.04 μm and an average lamellar colony size of 60 μm. The aging heat treatments generate beta phase precipitates along lamellar colony boundaries but not along lamellar interfaces, and result in lamellar degredation and grain growth. Constant load tensile creep and room temperature hardness tests are performed on step cooled heat treated and step cooled heat treated and aged specimens. Creep resistance, generally, improves with aging time, even with no interfacial precipitation, and the lamellar degredation that occurs with aging. The microstructures of the as-tested specimens are characterized and related to the creep properties. The hardness values are also compared as a function of selected heat treatment condition and microstructural features. © 2012 Trans Tech Publications, Switzerland.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21269357
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Record identifier1e31a2da-27d0-44f4-901d-f98930818bb0
Record created2013-12-12
Record modified2016-05-09
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