Journal
MATERIALS LETTERS
Volume 326, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2022.132949
Keywords
Additive manufacturing; Metals and alloys; Titanium alloy; Grain refinement; Microstructure; Mechanical properties
Funding
- National Natural Science Foundation of China [52101044]
- National Key R & D Program of China [2018YFB0407300]
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The addition of ZrB2 through laser melting deposition can refine the prior-beta grains in the TC4 titanium alloy, resulting in a fine basket-weave structure. The mechanical anisotropy of the modified-TC4 alloys decreases with the increase of ZrB2 content. The alloy with 0.5 wt% ZrB2 addition shows an excellent combination of strength and ductility, with isotropic characteristics.
In this study, a significant refinement of prior-beta grains was achieved in the TC4 (Ti-6Al-4V) titanium alloy through the addition of zirconium diboride (ZrB2), made additively by laser melting deposition (LMD). With the increase of ZrB2 content, the fine basket-weave structure was obtained instead of alpha-Widmansta spexpressioncing diexpressioneresis tten laths. The tensile results shown that the mechanical anisotropy of modified-TC4 alloys was decreasing in comparison with the as-deposited TC4 alloy. The higher content of forming eutectoid TiB phase resulted in the higher strength by precipitation strengthening but poorer elongation in the vertical direction. TC4 + 0.5ZrB(2) (TC4 with 0.5 wt% ZrB2 addition) alloy exhibited the excellent combination of strength and ductility and presented isotropic characteristics, which could be related to the synergetic effect of refinement of prior-beta grains and alpha phase and the trace formation of TiB phase.
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