期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 527, 期 16-17, 页码 4262-4269出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.03.044
关键词
Titanium alloy; Metastable phases; Transmission electron microscopy; Tensile test
In this study, the metastable beta Ti-12Mo (wt.%) alloy was synthesized by the cold crucible levitation melting (CCLM) method and then quenched in water from the beta domain. The tensile test carried out on the as-quenched alloy showed an important ductility reaching 45% of elongation before fracture. From the as-quenched metastable beta state, non-isothermal electrical resistivity and dilatometry measurements were carried out to detect the phase transition in order to control the nanophase precipitation sequence. After heating, XRD analysis and TEM observations revealed a very fine nano-scale omega and alpha precipitation in the beta matrix. Tensile test results indicated a very high strengthening effect after appropriate thermo-mechanical treatments, which was observed particularly huge after a two-step annealing process where a tensile strength as high as around 1600 MPa was obtained. This highly enhanced tensile strength was attributed to the complex intragranular nanostructure observed by TEM consisting of two-scale alpha nanoprecipitates inside sub-micrometer beta grains. (C) 2010 Elsevier B.V. All rights reserved.
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