In-situ Ni alloying for microstructure evolution and strength enhancement of laser aided additively manufactured Ti–6Al–4V alloy. (IMAGE)
Caption
The in-situ Ni alloying demonstrates four effects on the microstructure of LAAM Ti-6Al-4V alloy. (i) Ni additive can remarkably refine the prior-β grains. (ii) Ni additive can discernibly induce the formation of globular α phase. (iii) Ni additive can induce the precipitation of Ti2Ni nanoparticle. (iv) Ni as a well-known β-stabilizer and it can remarkably increase the volume fraction of β phase. Room-temperature tensile results demonstrated an increase in mechanical strength and an almost linearly decreasing elongation with increasing Ni addition. A modified mathematical model was used for quantitative analysis of the strengthening mechanism. It was evident from the results that the α lath phase and the solid solutes contribute the most to the overall yield strength of LAAM-built Ti-6Al-4V-xNi alloys in this work.
Credit
By Shang Sui, Youxiang Chew, Fei Weng, Chaolin Tan, Zhenglin Du, Guijun Bi.
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Credit must be given to the creator.
License
CC BY