Influence of specimen dimensions on the tensile behavior of ultrafine-grained Cu

Zhao, Yaohua; Guo, Yuan‐ji; Wei, Qian; Dangelewicz, Andrea M.; Xu, Cheng; Zhu, Yuntian; Langdon, Terence G.; Zhou, Yizhang; Lavernia, Enrique J.

doi:10.1016/j.scriptamat.2008.05.031

Cited by 254 publications

(112 citation statements)

References 12 publications

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“…For example, experiments have shown that the measured elongations to failure in tensile testing tend to increase with decreasing gauge length [47,48] and this is because the area of necking constitutes a major fraction of the gauge length in samples with very short gauge lengths so that much of the measured elongation in simple tensile testing is related to flow in the necked region. This suggests, therefore, that it may be unreasonable to make a direct comparison between the total elongations achieved in conventional tensile testing with longer gauge lengths with the results obtained in tensile testing using HPT samples with gauge lengths only of the order of ~1 mm.…”

Section: Significance Of Using Miniature Configurations In the Testinmentioning

confidence: 99%

Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys

Shahmir

Langdon

2017

Acta Materialia

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Experiments were conducted to investigate the processing parameters that may be used to optimize the properties of Ti-6Al-4V alloys. The alloy was initially subjected to two different heat treatments leading to the formation of martensitic αʹ and lamellar α+β microstructures and then both materials were processed by high-pressure torsion (HPT) for 10 turns at room temperature. This gave significant grain refinement to the nanometer range in both conditions and the occurrence of an allotropic hcp to fcc phase transformation in the martensitic alloy.These nanostructured alloys were subjected to post-deformation annealing (PDA) at temperatures in the range of 473 to 1023 K. The results show the hardness increases slightly to 773 K due to αʹ+fcc→α+β+fcc and α→α+β phase transformations in the martensitic αʹ and lamellar α+β alloys and then decreases up to 1023 K due to recrystallization and grain growth.An optimum property of a very high yield strength (~1120 MPa) and ultimate tensile strength (~1200 MPa), together with excellent ductility (elongation to failure of ~26%), was achieved in the Ti-6Al-4V martensitic alloy processed by a combination of HPT followed by PDA at 873 K for 60 min.

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Section: Significance Of Using Miniature Configurations In the Testinmentioning

confidence: 99%

Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys

Shahmir

Langdon

2017

Acta Materialia

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“…A decrease in measured strength with a decrease in specimen thickness was observed earlier. [50][51][52] The accuracy of yield stress calculation using the measured microstructural parameters decreased (error increased) with a decrease in deformation temperature. The following reasons can be suggested for this: for the 1348 K (1075°C) temperature schedule-overestimation of the solid solution strengthening contribution from C solute atoms; for the 1248 K (975°C) temperature schedule-overestimation of the precipitation strengthening and the solid solution strengthening contribution from C solute atoms; for the 1098 K (825°C) temperature schedule-overestimation of the solid solution strengthening contributions from C and Nb solute atoms.…”

Section: Effect Of Strengthening Mechanisms On the Yield Stressmentioning

confidence: 99%

Strengthening Mechanisms in Thermomechanically Processed NbTi-Microalloyed Steel

Kostryzhev

Marenych

Killmore³

et al. 2015

Metall Mater Trans A

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The effect of deformation temperature on microstructure and mechanical properties was investigated for thermomechanically processed NbTi-microalloyed steel with ferrite-pearlite microstructure. With a decrease in the finish deformation temperature at 1348 K to 1098 K (1075 °C to 825 °C) temperature range, the ambient temperature yield stress did not vary significantly, work hardening rate decreased, ultimate tensile strength decreased, and elongation to failure increased. These variations in mechanical properties were correlated to the variations in microstructural parameters (such as ferrite grain size, solid solution concentrations, precipitate number density and dislocation density). Calculations based on the measured microstructural parameters suggested the grain refinement, solid solution strengthening, precipitation strengthening, and work hardening contributed up to 32 pct, up to 48 pct, up to 25 pct, and less than 3 pct to the yield stress, respectively. With a decrease in the finish deformation temperature, both the grain size strengthening and solid solution strengthening increased, the precipitation strengthening decreased, and the work hardening contribution did not vary significantly. The effect of deformation temperature on microstructure and mechanical properties was investigated for thermomechanically processed NbTi-microalloyed steel with ferrite-pearlite microstructure. With a decrease in the finish deformation temperature at 1348 K to 1098 K (1075°C to 825°C) temperature range, the ambient temperature yield stress did not vary significantly, work hardening rate decreased, ultimate tensile strength decreased, and elongation to failure increased. These variations in mechanical properties were correlated to the variations in microstructural parameters (such as ferrite grain size, solid solution concentrations, precipitate number density and dislocation density). Calculations based on the measured microstructural parameters suggested the grain refinement, solid solution strengthening, precipitation strengthening, and work hardening contributed up to 32 pct, up to 48 pct, up to 25 pct, and less than 3 pct to the yield stress, respectively. With a decrease in the finish deformation temperature, both the grain size strengthening and solid solution strengthening increased, the precipitation strengthening decreased, and the work hardening contribution did not vary significantly.

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“…In many cases, the specimen's dimensions were other than dictated by ASTM. They have investigated the impacts of specimen size and geometry on the tensile strength of pure ultra-fine-grained copper [27]. The tensile property of two materials has been investigated and the impacts of changing the gage length on mechanical properties observed [28].…”

Section: Tensile Testmentioning

confidence: 99%

Investigation of micro-structure and mechanical properties of three steel alloys

Jha¹

2017

Int. J. Automot. Mech. Eng.

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The significant demands of steel in industrial applications and automotive and building industries are increasing. Thus, there is a need for the improvement of its mechanical properties by adding suitable alloy elements to them so that they have more strengthweight ratio. The objective of this research is to study the effect of adding various alloys to steel material and their effects on tensile and impact strengths, hardness, and microstructure. The tensile test was conducted on a round bar standard specimens of three kinds of steel having different compositions to investigate their mechanical properties. The results of tensile tests are given in tables, based on their stress-strain curves plotted to facilitate the design engineer to know the strength and accordingly design lightweight structures from this material. After the test, the microstructure of the fracture surface was observed using an inverted microscope. The tensile and impact strengths and hardness of carbon steel, EN 8 steel, and mild steel were evaluated and compared based on the chemical composition and microstructural observation. The experimental result showed that the increasing percentage of carbon and silicon in EN 8 steel increased its ultimate tensile and yielded strengths but reduced the percentage elongation compared to carbon steel. Similarly, less content of manganese with an increased content of nickel enhanced the impact strength of the mild steel but slightly reduced the tensile strength and hardness of mild steel compared to EN 8 steel.

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Influence of specimen dimensions on the tensile behavior of ultrafine-grained Cu

Cited by 254 publications

References 12 publications

Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys

Using heat treatments, high-pressure torsion and post-deformation annealing to optimize the properties of Ti-6Al-4V alloys

Strengthening Mechanisms in Thermomechanically Processed NbTi-Microalloyed Steel

Investigation of micro-structure and mechanical properties of three steel alloys

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