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Title: Plastic deformation of Ti-6Al-4V micro-pillars at room temperature
Author: Liu, Zhaoran
ISNI:       0000 0004 6493 9156
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2017
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In this work, the deformation behaviour of Ti-6Al-4V micro-pillars was studied via compression tests at room temperature. Micro-pillars containing either the single α phase region or both α and β phases were prepared and either prismatic < a > slips or < c+a > slips were activated. Thin foils for TEM study were prepared using the FIB from the selected deformed pillars. STEM was used to image dislocations and their interaction with the α/β interfaces. Sample yield strength has been observed in all groups of micro-pillars and its relationship with the β phase, α/β interface, orientation and extrinsic sample size was discussed. The β phase is proved weaker than the α phase and the α/β interfaces behaviour as both the barriers and sources of dislocations. The magnitude of influence depending on the volume fraction, orientation and morphology of the β phase and the α/β interfaces. The work-hardening rate is related to the orientation of micro-pillars and the α/β interfaces in the micro-pillars. The strain bursts can be suppressed by the α/β interface and smaller sample size. The sample with smaller size expressed the larger strain burst in the stress-strain curves. The orientation influences the number and magnitude of strain bursts.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TN Mining engineering. Metallurgy