Effect of scan line spacing on texture, phase and nanohardness of TiAl/TiB2 metal matrix composites fabricated by selective laser melting
作者： Yi Yang , Shifeng Wen , Qingsong Wei , Wei Li , Jie Liu
DOI: 10.1016/J.JALLCOM.2017.09.053
关键词:
摘要: Abstract The TiAl/TiB2 metal matrix composites (MMCs) are fabricated by selective laser melting (SLM), and the effects of scan line spacing on grains feature, crystallographic texture, phases evolution mechanism nanohardness have been systematic studied. With increase spacing, relatively coarse with average grain size 4.9 ± 0.2 μm strong ( 0001 ) orientation gradually transforms into refined 4.2 ± 0.1 μm dominated 11 2 ¯ 1 01 orientations during SLM process. SLM-processed MMCs samples high-angle boundaries (HAGBs) α2 phase, from 80 μm to 140 μm, both volume fraction HAGBs phase decrease. During process, can be expressed as: (200)β first transformed (11 0)α2, (20 0)α2 (110)γ, then TiB2, residual B2 incompletely γ randomly distribute in matrix, relationship α2, γ, TiB2 concluded 0 α2// 110 B2// γ// TiB2. Besides, there some TiB which is induced Ti + TiB2 → 2TiB reaction SLM. show an ultra-high ranging 8.6 ± 0.4 GPa 9.4 ± 0.5 GPa superior than that reinforced TiAl alloy counterpart (6.7 ± 0.4 GPa) traditional roll bonding.
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