首页|Identification of unusual large zones of Category I triple-alpha-variant clusters in additively manufactured Ti-4Al-2V alloy
Identification of unusual large zones of Category I triple-alpha-variant clusters in additively manufactured Ti-4Al-2V alloy
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NSTL
Elsevier
? 2022 Acta Materialia Inc.In α-phase dominant Ti alloys, the α/α boundaries are the main interfaces in the microstructure in terms of both their distribution and total area. This work reports identification of unusual large zones of Category I triple-α-variant clusters in laser metal (powder) deposited (LMD) Ti-4Al-2V alloy. These clusters lead to a continuous distribution of the Type 2 α/α boundary ([112ˉ0]/60°) in the microstructure, which possesses lower boundary energy than the Types 3–6 α/α boundaries, where the distribution of Type 1 α/α boundary is negligible. The formation of these large zones of Category I clusters can be understood using the autocatalysis nucleation and subsequent chain reaction theory suggested by J W Christian based on self-accommodation. These experimental observations imply that it is perhaps plausible to produce low energy α-variant boundary configurations through exploiting the confluence of alloy composition and additive manufacturing conditions.
NSTL
Elsevier
