Microstructure and mechanical properties of MWCNT/Ti6Al4V composites consolidated by vacuum sintering
Ti6Al4V alloys with low weight, high corrosion resistance, high melting point, high biocompatibility and unique mechanical properties have been receiving great attention for wide applicability in many industry fields such as automobiles, aerospace and biomedical. However, Ti6Al4V tends to be easily...
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Veröffentlicht in: | Science of sintering 2020, Vol.52 (2), p.187-194 |
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Sprache: | eng |
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Zusammenfassung: | Ti6Al4V alloys with low weight, high corrosion resistance, high melting
point, high biocompatibility and unique mechanical properties have been
receiving great attention for wide applicability in many industry fields
such as automobiles, aerospace and biomedical. However, Ti6Al4V tends to be
easily oxidized at high temperature, exhibit low thermal conductivity, low
hardness and low yield strength and thus have led to the limitation of
applicability in many industries. In this study, we have fabricated Ti6Al4V
matrix composites reinforced with multi-walled carbon nanotubes (MWCNT) to
enhance the hardness and yield strength. Vacuum sintering technique has been
used to prepare MWCNT/Ti6Al4V composites. Microstructural and phase studies
indicated that the composite structure consists of two main phases including
?-Ti and ?-Ti and MWCNTs were uniformly dispersed in Ti6Al4V matrix. The
relative density of composite decreases as the CNT content increases as
resulted from the porous structure of the CNT, which limits the aggregation
process of the composite. When the CNT content increased, the hardness and
yield strength of the composite increased, reaching maximum values of 378 HV
and 356 MPa with 2 vol.% MWCNTs, which are nearly 16 and 38% higher than
those of Ti6Al4V alloy. The enhancement in hardness and compressive strength
is attributed to the good mechanical properties of MWCNTs and load transfer
effect from Ti6Al4V alloy matrix to reinforcement material.
nema |
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ISSN: | 0350-820X 1820-7413 |
DOI: | 10.2298/SOS2002187P |