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Formation of Fine B2/ β + O Structure and Enhancement of Hardness in the Aged TiAlNb-Based Alloys Prepared by Spark Plasma Sintering.
- Source :
- Metallurgical & Materials Transactions. Part A; Sep2017, Vol. 48 Issue 9, p4365-4371, 7p, 3 Diagrams, 5 Graphs
- Publication Year :
- 2017
-
Abstract
- TiAlNb-based alloys synthesized at 1223 K (950 °C) by spark plasma sintering were aged at 973 K, 1023 K, 1073 K, and 1123 K (700 °C, 750 °C, 800 °C, and 850 °C), respectively. Phase composition, microstructure, and microhardness of the aged alloys were investigated in this study. Equiaxed O grains and Widmanstätten B2/ β + O laths were formed in the aged alloys, and the microhardness was improved in contrast with the spark plasma-sintered alloy without aging. The microhardness relies largely on the O-phase content, as well as the length and width of the O laths. In particular, complete Widmanstätten B2/ β + O laths, with locally finely dispersed β precipitates, were obtained in the alloy aged at 1073 K (800 °C), and the alloy exhibited the best microhardness performance. Such fine structure is due to the temperature-dependent transformations O→O + B2/ β , O→O + B2/ β , and B2/ β →O. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10735623
- Volume :
- 48
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Metallurgical & Materials Transactions. Part A
- Publication Type :
- Academic Journal
- Accession number :
- 124376415
- Full Text :
- https://doi.org/10.1007/s11661-017-4193-8