Journal
MATERIALIA
Volume 26, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtla.2022.101636
Keywords
Titanium alloys; Additive manufacturing; Electron backscattering diffraction (EBSD); Transmission electron microscopy (TEM); High resolution digital image correlation; (HRDIC)
Categories
Funding
- National Natural Science Foundation of China [52204391, 12104517]
- 2021 Guangdong Province Science and Technology Special Fund Project [STKJ2021025]
- Shantou University Research Foundation for Talents [NTF21013]
- Top Talents Program' of Sun Yat-sen University [29000-18841290]
- Henry Royce Institute for Advanced Materials, through EPSRC [EP/R00661X/1, EP/S019367/1, EP/P025021/1, EP/P025498/1]
Ask authors/readers for more resources
The influence of different bi-lamellar microstructures on the mechanical performance of Ti-6Al-4V alloy was investigated. The results showed that a higher volume fraction of secondary alpha lamellae can significantly increase yield strength without compromising ductility.
The influence of two different bi-lamellar microstructures, with varied volume fractions of primary alpha lamellae (alpha p) and secondary alpha lamellae (alpha s), on the mechanical performance of laser powder bed fusion fabricated Ti-6Al-4V has been investigated. A low and high alpha p volume fraction variant was created by different solution heat treatment temperatures. Scanning transmission electron microscopy (STEM) was performed on both materials to give a comprehensive assessment of the local microstructure and element partitioning effects. Deformation experiments, combined with high resolution digital image correlation (HRDIC), enabled a detailed comparison of 2D slip patterns at progressive strain increments during tensile loading, with the underlying microstructure collected using electron backscattering diffraction based grain orientation mapping. In both microstrural variants, shear strain was mainly observed in the coarse alpha p lamellae, suggesting that the constituent was softer than the fine alpha s regions. This strength difference is not attributed to potential different levels of Albased solid solution strengthening as a result of element partitioning. Instead, the strength difference was attributed to the fine beta ligaments formed in-between the alpha s during ageing. The low alpha p volume fraction variant, i.e. high-volume fraction of alpha s, displayed a significant increase in yield strength compared to the high alpha p volume fraction variant without compromising ductility through increased heterogeneous plasticity and an enhanced strain hardening rate.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available