Vickers and Knoop Micro-hardness Behavior of Coarse-and Ultrafine-grained Titanium

Sanosh, K.P.; Balakrishnan, Avinash; Francis, Lijo; Kim, T. N.

doi:10.1016/s1005-0302(10)60145-4

Cited by 27 publications

(17 citation statements)

References 18 publications

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“…Grain size plays an important role in improving the strength of polycrystalline metallic materials [3,34]. Figure 10 …”

Section: Correlation Between Microstructures and Mechanical Propertiementioning

confidence: 99%

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Fabrication of an Ultra-Fine Grained Pure Titanium with High Strength and Good Ductility via ECAP plus Cold Rolling

Jiang

Liu

et al. 2017

Metals

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Microstructure evolutions and mechanical properties of a commercially pure titanium (CP-Ti, grade 2) during multi-pass rotary-die equal-channel angular pressing (RD-ECAP) and cold rolling (CR) were systematically investigated in this work, to achieve comprehensive property for faster industrial applications. The obtained results showed that the grain size of CP-Ti decreased from 80 µm of as-received stage to 500 nm and 310 nm after four passes and eight passes of ECAP, respectively. Moreover, abundant dislocations were observed in ECAP samples. After subsequent cold rolling, the grain size of ECAPed CP-Ti was further refined to 120 nm and 90 nm, suggesting a good refining effect by combination of ECAP and CR. XRD (X-ray diffractometer) analysis and TEM (transmission electron microscope) observations indicated that the dislocation density increased remarkably after subsequent CR processing. Room temperature tensile tests showed that CP-Ti after ECAP + CR exhibited the best combination of strength and ductility, with ultimate tensile strength and fracture strain reaching 920 MPa and 20%. The high strength of this deformed CP-Ti originated mainly from refined grains and high density of dislocations, while the good ductility could be attributed to the improved homogeneity of UFG (ultra-fine grained) microstructure. Thus, a high strength and ductility ultra-fine grained CP-Ti was successfully prepared via ECAP plus CR.

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“…Grain size plays an important role in improving the strength of polycrystalline metallic materials [3,34]. Figure 10 …”

Section: Correlation Between Microstructures and Mechanical Propertiementioning

confidence: 99%

“…Therefore, there is a strong need to develop a substitution for Ti-6Al-4V alloy. Grade 2 CP-Ti (TA2) with much lower cost, exhibits a similar corrosion resistance as titanium alloy, but with relatively low mechanical properties (especially its poor strength) [3]. Hence lots of efforts still need to be made to improve the strength of CP-Ti.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of an Ultra-Fine Grained Pure Titanium with High Strength and Good Ductility via ECAP plus Cold Rolling

Jiang

Liu

et al. 2017

Metals

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“…Microhardness is an important parameter that could be used to define the mechanical properties in relation to its microstructure. Focus has been made on the relationship of hardness with grain size for commercially pure titanium and ultrafine grained titanium [16]. Vickers and Knoop indentations of ultrafine grained titanium at different loads were ∼2.5 times harder than those of pure titanium.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Microhardness Analysis of MWCNT/MnO₂Nanocomposite

Hussain

Khan

Nagarajan

et al. 2016

Journal of Materials

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Recent research has shown that carbon nanotube (CNT) acts as a model reinforcement material for fabricating nanocomposites. The addition of CNT as a reinforcing material into the matrix improves the mechanical, thermal, tribological, and electrical properties. In this research paper multiwalled carbon nanotube (MWCNT), with different weight percentage (5%, 10%, and 15%), was reinforced into manganese dioxide (MnO 2 ) matrix using solution method. The different weight % of MWCNT/MnO 2 nanocomposite powders was compacted and then sintered. The phase analysis, morphology, and chemical composition of the nanocomposites were examined by X-ray diffractometer, Field Emission Scanning Electron Microscope (FESEM), and Energy Dispersive X-Ray (EDX), respectively. The XRD analysis indicates the formation of MWCNT/MnO 2 nanocomposites. The FESEM surface morphology analysis shows that MnO 2 nanotube is densely grown on the surface of MWCNT. Further, microhardness of MWCNT/MnO 2 nanocomposite was measured and it was found that 10 wt% has higher microhardness in comparison to 5 and 15 wt%. The microhardness of the composites is influenced by mass density, nanotube weight fraction, arrangement of tubes, and dispersion of MWCNT in H 2 SO 4 (aq) solution.

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“…In order to fully characterize titanium for potential applications under extreme conditions, it is necessary to examine the dynamic mechanical behavior and to clarify the microstructural evolution during dynamic deformation over a wide temperature range. Whilst there are many studies documenting the properties of UFG/NC Ti focusing on annealing instabilities [22], strain hardening behavior [23], tribological properties [24,25] and micro-hardness [26], relatively little attention has been directed towards the effects of strain rate and temperature on the mechanical behavior and the microstructural evolution of UFG/NC Ti during dynamic impact deformation. Accordingly, this research was initiated to examine the dynamic mechanical properties and the microstructural evolution of NC Ti at high strain rates of ~10 3 s -1 over a range of temperatures.…”

Section: Introductionmentioning

confidence: 99%

Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti

Zhang

Wang

Zhilyaev

et al. 2015

Materials Science and Engineering: A

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The mechanical behavior of commercial purity titanium with a nanocrystalline (NC) grain size was investigated using split Hopkinson pressure bar tests at high strain rates and over a range of temperatures. The study was accompanied by detailed microstructural investigations before and after compression testing. The results show that rotary dynamic recrystallization operates during compressive deformation at strain rates of ~3000 and ~4500 s -1 at temperatures from 298 to 573 K but cells form at 673 K. The dynamic mechanical behavior of NC Ti shows a strong dependence on temperature and strain rate such that the flow stress and the strain hardening rate both increase with increasing strain and decreasing temperature. A constitutive equation is derived to relate the flow stress to the temperature, strain rate and true strain and to predict the yield strength and the peak stress of NC Ti subjected to dynamic deformation at elevated temperatures.

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Vickers and Knoop Micro-hardness Behavior of Coarse-and Ultrafine-grained Titanium

Cited by 27 publications

References 18 publications

Fabrication of an Ultra-Fine Grained Pure Titanium with High Strength and Good Ductility via ECAP plus Cold Rolling

Fabrication of an Ultra-Fine Grained Pure Titanium with High Strength and Good Ductility via ECAP plus Cold Rolling

Fabrication and Microhardness Analysis of MWCNT/MnO₂Nanocomposite

Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti

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Vickers and Knoop Micro-hardness Behavior of Coarse-and Ultrafine-grained Titanium

Cited by 27 publications

References 18 publications

Fabrication of an Ultra-Fine Grained Pure Titanium with High Strength and Good Ductility via ECAP plus Cold Rolling

Fabrication of an Ultra-Fine Grained Pure Titanium with High Strength and Good Ductility via ECAP plus Cold Rolling

Fabrication and Microhardness Analysis of MWCNT/MnO2Nanocomposite

Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti

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Fabrication and Microhardness Analysis of MWCNT/MnO₂Nanocomposite