High temperature deformation behavior and microstructural evolution of Ti-47Al-2Cr-4Nb intermetallic alloys
Journal Article
·
· Scripta Materialia
- Korea Advanced Inst. of Science and Technology, Taejon (Korea, Republic of). Dept. of Materials Science and Engineering
TiAl-base intermetallic compounds have been investigated for advanced high temperature structural applications due to their attractive properties such as low density, good elevated temperature strength, high resistance to oxidation and excellent creep properties. However, the poor ductility and low fracture toughness of TiAl-base intermetallic compounds at ambient temperature are the major limitations for practical application. A great deal of researches have been conducted to improve the ductility and fracture toughness. Some possibilities were suggested to overcome the brittleness through alloy design and microstructural control. Thermomechanical treatment has been applied to refine the grain size and to control the microstructure into equiaxed, duplex or lamellar structure in order to optimize the required mechanical properties. The thermomechanical process can be divided into two steps as hot working process and heat treatment process. In this study, the dynamically recrystallized structures were investigated during high temperature compression deformation of Ti-47Al-2Cr-4Nb intermetallic alloys and the constitutive relationships between the recrystallized grain size and steady state flow stress were analyzed. A constitutive equation in steady state is suggested, and the controlling mechanism for high temperature deformation in steady state regime is discussed.
- OSTI ID:
- 619500
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 10 Vol. 38; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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