Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7970764 | Materials Characterization | 2014 | 8 Pages |
Abstract
The microstructure and mechanical properties of the Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy produced by laser melting deposition have been investigated. The columnar grains of the Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy due to the layer-by-layer epitaxial growth from the underlying template grains during laser melting deposition, which is roughly parallel to the deposition direction, had been found by optical microscopy; strong 101¯2α crystallographic texture has been confirmed by X-ray diffraction and electron backscattered diffraction. Depending on the last heating history, the microstructure of the alloy undergoes a continued change opposite to the deposition direction: martensitic αⲠ(transformed β); coarsened primary α laths with transformed β; coarsened primary α laths; and the fine basketweave microstructure with a few coarsened α laths or annealed martensitic αâ². The average Vickers micro-hardness value of the alloy is 364 HV. The alloy parallel to the deposition direction presents lower tensile strength (925 MPa) and better elongation (18.8%), compared with 1025 MPa and 8.2% of that vertical to the deposition direction, which has been discussed using its microstructure characterization.
Keywords
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Zheng Liu, Zuo-Xiang Qin, Fang Liu, Xing Lu, Hua-Ming Wang,