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Pranjal Nautiyal - One of the best experts on this subject based on the ideXlab platform.
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influence of loading path and precipitates on indentation creep behavior of wrought mg 6 wt al 1 wt zn magnesium alloy
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016Co-Authors: Pranjal Nautiyal, Jayant Jain, Arvind AgarwalAbstract:Abstract This study reports the effect of loading path and precipitates on indentation induced creep behavior of AZ61 magnesium alloy. Indentation creep tests were performed on solution-treated and peak-Aged extruded AZ61 magnesium alloy, and Atomic Force Microscopy (AFM) investigations were carried out to study deformation mechanisms. Twinning is the dominant creep mechanism for indentation along the extrusion direction (ED) in solution-treated alloy. A combination of slip and twinning appears to be the prominent mechanisms for indentation creep perpendicular to ED. Creep flow is arrested for indentation perpendicular to ED, due to slip–twin interactions. Influence of precipitates on creep deformation was also studied. Aged Specimen exhibited higher creep resistance than solution-treated Specimen. Unlike solution-treated Specimens, twinning was not observed in Aged alloy. Creep in Aged Specimen was attributed to slip.
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Influence of loading path and precipitates on indentation creep behavior of wrought Mg–6 wt% Al–1 wt% Zn magnesium alloy
Materials Science and Engineering: A, 2016Co-Authors: Pranjal Nautiyal, Jayant Jain, Arvind AgarwalAbstract:Abstract This study reports the effect of loading path and precipitates on indentation induced creep behavior of AZ61 magnesium alloy. Indentation creep tests were performed on solution-treated and peak-Aged extruded AZ61 magnesium alloy, and Atomic Force Microscopy (AFM) investigations were carried out to study deformation mechanisms. Twinning is the dominant creep mechanism for indentation along the extrusion direction (ED) in solution-treated alloy. A combination of slip and twinning appears to be the prominent mechanisms for indentation creep perpendicular to ED. Creep flow is arrested for indentation perpendicular to ED, due to slip–twin interactions. Influence of precipitates on creep deformation was also studied. Aged Specimen exhibited higher creep resistance than solution-treated Specimen. Unlike solution-treated Specimens, twinning was not observed in Aged alloy. Creep in Aged Specimen was attributed to slip.
Arvind Agarwal - One of the best experts on this subject based on the ideXlab platform.
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influence of loading path and precipitates on indentation creep behavior of wrought mg 6 wt al 1 wt zn magnesium alloy
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016Co-Authors: Pranjal Nautiyal, Jayant Jain, Arvind AgarwalAbstract:Abstract This study reports the effect of loading path and precipitates on indentation induced creep behavior of AZ61 magnesium alloy. Indentation creep tests were performed on solution-treated and peak-Aged extruded AZ61 magnesium alloy, and Atomic Force Microscopy (AFM) investigations were carried out to study deformation mechanisms. Twinning is the dominant creep mechanism for indentation along the extrusion direction (ED) in solution-treated alloy. A combination of slip and twinning appears to be the prominent mechanisms for indentation creep perpendicular to ED. Creep flow is arrested for indentation perpendicular to ED, due to slip–twin interactions. Influence of precipitates on creep deformation was also studied. Aged Specimen exhibited higher creep resistance than solution-treated Specimen. Unlike solution-treated Specimens, twinning was not observed in Aged alloy. Creep in Aged Specimen was attributed to slip.
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Influence of loading path and precipitates on indentation creep behavior of wrought Mg–6 wt% Al–1 wt% Zn magnesium alloy
Materials Science and Engineering: A, 2016Co-Authors: Pranjal Nautiyal, Jayant Jain, Arvind AgarwalAbstract:Abstract This study reports the effect of loading path and precipitates on indentation induced creep behavior of AZ61 magnesium alloy. Indentation creep tests were performed on solution-treated and peak-Aged extruded AZ61 magnesium alloy, and Atomic Force Microscopy (AFM) investigations were carried out to study deformation mechanisms. Twinning is the dominant creep mechanism for indentation along the extrusion direction (ED) in solution-treated alloy. A combination of slip and twinning appears to be the prominent mechanisms for indentation creep perpendicular to ED. Creep flow is arrested for indentation perpendicular to ED, due to slip–twin interactions. Influence of precipitates on creep deformation was also studied. Aged Specimen exhibited higher creep resistance than solution-treated Specimen. Unlike solution-treated Specimens, twinning was not observed in Aged alloy. Creep in Aged Specimen was attributed to slip.
Jayant Jain - One of the best experts on this subject based on the ideXlab platform.
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influence of loading path and precipitates on indentation creep behavior of wrought mg 6 wt al 1 wt zn magnesium alloy
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016Co-Authors: Pranjal Nautiyal, Jayant Jain, Arvind AgarwalAbstract:Abstract This study reports the effect of loading path and precipitates on indentation induced creep behavior of AZ61 magnesium alloy. Indentation creep tests were performed on solution-treated and peak-Aged extruded AZ61 magnesium alloy, and Atomic Force Microscopy (AFM) investigations were carried out to study deformation mechanisms. Twinning is the dominant creep mechanism for indentation along the extrusion direction (ED) in solution-treated alloy. A combination of slip and twinning appears to be the prominent mechanisms for indentation creep perpendicular to ED. Creep flow is arrested for indentation perpendicular to ED, due to slip–twin interactions. Influence of precipitates on creep deformation was also studied. Aged Specimen exhibited higher creep resistance than solution-treated Specimen. Unlike solution-treated Specimens, twinning was not observed in Aged alloy. Creep in Aged Specimen was attributed to slip.
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Influence of loading path and precipitates on indentation creep behavior of wrought Mg–6 wt% Al–1 wt% Zn magnesium alloy
Materials Science and Engineering: A, 2016Co-Authors: Pranjal Nautiyal, Jayant Jain, Arvind AgarwalAbstract:Abstract This study reports the effect of loading path and precipitates on indentation induced creep behavior of AZ61 magnesium alloy. Indentation creep tests were performed on solution-treated and peak-Aged extruded AZ61 magnesium alloy, and Atomic Force Microscopy (AFM) investigations were carried out to study deformation mechanisms. Twinning is the dominant creep mechanism for indentation along the extrusion direction (ED) in solution-treated alloy. A combination of slip and twinning appears to be the prominent mechanisms for indentation creep perpendicular to ED. Creep flow is arrested for indentation perpendicular to ED, due to slip–twin interactions. Influence of precipitates on creep deformation was also studied. Aged Specimen exhibited higher creep resistance than solution-treated Specimen. Unlike solution-treated Specimens, twinning was not observed in Aged alloy. Creep in Aged Specimen was attributed to slip.
Vincent Placet - One of the best experts on this subject based on the ideXlab platform.
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Influence of hydrothermal ageing on the fatigue behaviour of a unidirectional flax-epoxy laminate
Composites Part B: Engineering, 2019Co-Authors: Thomas Jeannin, Michaël Berges, Xavier Gabrion, Romain Léger, Véronique Person, Stéphane Corn, Benoit Piezel, Patrick Ienny, Stéphane Fontaine, Vincent PlacetAbstract:Abstract Although the research and development in plant fibre composites is growing rapidly, these materials still require specific considerations before being adopted by industry in structural applications. One of the main issue is related to their durability. The objective of this study is to investigate the influence of hydrothermal ageing on the fatigue behaviour of an unidirectional flax-epoxy laminated composite by implementing the fatigue tests in a water bath. Results show that while the quasi-static strength and rigidity are significantly affected by the ageing, the fatigue strength is however improved. The fatigue strength coefficient is more than two times lower after ageing, indicating a lower decrease of the maximum stress with the increasing number of cycles. After ageing, the maximum stress level for an expected lifetime of 5.3 106 cycles is approximately 90 MPa, which is comparable to the one of unAged Specimens. It is also pointed out that the remaining quasi-static tensile properties and behaviour of the Aged Specimen are not significantly affected after 1.3 106 cycles at a stress level of 90 MPa.
L.w. Tsay - One of the best experts on this subject based on the ideXlab platform.
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Fatigue Crack Growth Characteristics of a Ti-15V-3Cr-3Sn-3Al Alloy with Variously Aged Conditions
MATERIALS TRANSACTIONS, 2013Co-Authors: L.w. Tsay, S. T. Chang, C. ChenAbstract:In this study, the fatigue crack growth rate (FCGR) of a Ti15V3Cr3Al3Sn (Ti-15-3) alloy, which was Aged at a temperature range of 371 to 593°C, was measured in air at room temperature. The Specimen Aged at 371°C showed clear serrations in the crack growth curve at a stress ratio (R) of 0.1, and it also exhibited a larger Paris law gradient than the other Aged Specimens at R = 0.5. The peak-Aged (426°C Aged) Specimen had the highest FCGR of the Specimens, regardless of the stress ratio. A gradual decrease in the FCGRs with increasing aging temperature, from 482 to 593°C, was observed for the over-Aged Specimens. Cleavage-like fracture was more likely to occur in the under- and peak-Aged Specimens as compared to the transgranular fatigue in the over-Aged Specimens. It seemed that the coarse i platelets with lowered hardness in the over-Aged Specimens resulted in a higher resistance to fatigue crack growth in the Ti-15-3 alloy. [doi:10.2320/matertrans.M2012349]
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Fatigue Crack Growth of Ti-15V-3Cr-3Sn-3Al Alloy
Advanced Materials Research, 2012Co-Authors: S. T. Chang, L.w. TsayAbstract:In this study, the fatigue crack growth rates (FCGRs) of Ti-15V-3Cr-3Al-3Sn alloy Aged in the temperature ranges from 426 to 593 oC for 8 hrs was determined at stress ration of 0.1 or 0.5. The results of fatigue crack growth tests revealed the FCGRs decreased with increasing aging temperature. Generally, the 426oC Aged Specimen had the highest FCGRs among the Specimens being tested, regardless of stress ratio. It was noted obvious increase in FCGRs occurred for the 482oC Aged Specimen at stress ratio of 0.5. Fatigue fracture appearance of various Specimens tested in air exhibited predominantly transgranular fatigue fracture with coarse stripes for the Specimens Aged at/above 538oC. Intergranular fracture was more likely to be found in the 426oC Aged Specimen, and for the A482 Specimen tested at high stress ratio.
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hydrogen embrittlement susceptibility and permeability of two ultra high strength steels
Corrosion Science, 2006Co-Authors: L.w. Tsay, M Y Chi, D Y LinAbstract:Abstract Slow displacement rate tensile tests were carried out in a saturated H2S solution to investigate the effect of hydrogen embrittlement on notched tensile strength (NTS) and fracture characteristics of two ultra-high strength steels (PH 13-8 Mo stainless steel and T-200 maraging steel). Hydrogen permeation properties were determined by an electrochemical permeation method. The results of permeation tests indicated that over-Aged Specimens showed a lower diffusivity/hydrogen flux and higher solubility than those solution-annealed. The great increase in reverted austenite (irreversible hydrogen traps) together with numerous precipitates at the expense of dislocations (reversible) in the over-Aged Specimen led to such a change in permeability. Ordinary tensile tests indicated that four tested Specimens had roughly the same yield strength level. Hence, the hydrogen embrittlement susceptibility of the material could be related to their permeation properties. The uniform distribution of strong hydrogen traps in over-Aged Specimens instead of weak traps in the solution-annealed impeded the hydrogen transport toward the strained region, thus, the resistance to sulfide stress corrosion cracking was improved in over-Aged Specimens.
