The effect of grain size on the yield strength of Ni3Al

Schulson, E. M.; Weihs, Timothy P.; Viens, D.V.; Baker, I.

doi:10.1016/0001-6160(85)90152-x

Cited by 167 publications

(33 citation statements)

References 15 publications

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“…Figure 9 shows that the apparent friction stress is negative for the dilute alloy and this is not physically meaningful. Similar behavior has been noted for ordered Ni 3 Al, [58] and in both that work and ours, it must be concluded that the H-P paradigm does not always apply for very large grain sizes. It is noteworthy that Ni 3 Al had a much higher k value in the ordered state than in the disordered one, in keeping with other Ll 2 structures.…”

Section: Solute Effects On R O and Ksupporting

confidence: 89%

Grain Size Hardening in Mg and Mg-Zn Solid Solutions

Cáceres

Mann

Griffiths

2011

Metall Mater Trans A

133

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Cast specimens of Mg and of several Mg-Zn binary alloys with a wide range of grain sizes were deformed in tension and compression. The k values calculated from the Hall-Petch (H-P) plots of the tensile 0.2 pct proof stress increased with the Zn content, from 0.24 MPa m 1/2 for pure Mg to~0.66 MPa m 1/2 for the 2.3 at. pct Zn alloy; k values measured from compression tests were larger, typically by 0.05 MPa m 1/2 . When the strength measurements were corrected for the pseudoelastic strain resulting from elastic twinning, the k values generally increased, and the difference between tension and compression was eliminated. This showed that the larger k values obtained in compression using uncorrected data were an artifact of the pseudoelastic effect. The apparent friction stress varied between about 14 MPa for pure Mg to very low or negative values for the most dilute alloy, increasing again to about 8 MPa for the most concentrated alloy. The use of strength data corrected for pseudoelasticity effects is necessary for a consistent analysis of the grain size hardening.

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Section: Solute Effects On R O and Ksupporting

confidence: 89%

Grain Size Hardening in Mg and Mg-Zn Solid Solutions

Cáceres

Mann

Griffiths

2011

Metall Mater Trans A

133

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“…Therefore, the continuous appearance of this situation produced a yield platform. Besides, the decrease of grain size was beneficial for producing the yield platform and increasing the extension length of the yield platform [9,34]. Hence, the appearance of the yield plateau in bimodal ferrite steel was mainly due to ultrafine grains of ferrite and numerous nano-scale carbides.…”

Section: Mechanical Properties Of the Annealed Microstructuresmentioning

confidence: 99%

Study on Microstructure and Properties of Bimodal Structured Ultrafine-Grained Ferrite Steel

Niu

Zhang

et al. 2017

Metals

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Abstract:The objective of the study research was to obtain bimodal structured ultrafine-grained ferrite steel with outstanding mechanical properties and excellent corrosion resistance. The bimodal microstructure was fabricated by the cold rolling and annealing process of a dual-phase steel. The influences of the annealing process on microstructure evolution and the mechanical properties of the cold-rolled dual-phase steel were investigated. The effect of bimodal microstructure on corrosion resistance was also studied. The results showed that the bimodal characteristic of ferrite steel was most apparent in cold-rolled samples annealed at 650 • C for 40 min. More importantly, due to the coordinated action of fine-grained strengthening, back-stress strengthening, and precipitation strengthening, the yield strength (517 MPa) of the bimodal microstructure improved significantly, while the total elongation remained at a high level of 26%. The results of corrosion experiments showed that the corrosion resistance of bimodal ferrite steel was better than that of dual-phase steel with the same composition. This was mainly because the Volta potential difference of bimodal ferrite steel was smaller than that of dual-phase steel, which was conducive to forming a protective rust layer.

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“…[13][14][15][16][17][18][19] To explain this phenomenon, various theories about solid solution softening effect of boron were developed. According to Jahazi et al 30) boron atoms can occupy either substitutional or interstitial sites.…”

Section: Peak Stress and Critical Stressmentioning

confidence: 99%

“…Mejía 13) and López-Chipres etc. [14][15][16] have reported that boron addition accelerates the onset of DRX. However, Kim, 17) Banks 18) and Stumpf 19) observed that boron having a delayed effect of the onset and rate of DRX.…”

Section: Peak Strain and Critical Strainmentioning

confidence: 99%

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Effect of Titanium on Hot Deformation Behaviors of Boron Microalloyed Steel

Gao¹,

Xue²,

Yang³

2016

ISIJ Int.

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The hot deformation behaviors of titanium-free and titanium-treated boron microalloyed steel were investigated at the temperatures from 850°C to 1 100°C and strain rates from 0.1 s − 1 to 10 s − 1 on Gleeble-2000 thermo-mechanical simulator. It was found that the flow stress of the titanium-treated steel is lower than that of titanium-free at lower strain rates, indicating that titanium addition generates a softening effect. The flow stress constitutive equations of hot deformation were developed for the experimental steels, the activation energy of titanium-treated steel (299.7 kJ·mol − 1 ) is higher than that of the titanium-free steel (286.9 kJ·mol − 1 ). Additionally, it is interesting to note that the peak and critical strain are lowered by titanium addition, indicating that titanium has the ability to promote the onset of dynamic recrystallization. However, the dynamic recrystallization kinetics of titanium-free steel is faster than that of titanium-treated steel.

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The effect of grain size on the yield strength of Ni3Al

Cited by 167 publications

References 15 publications

Grain Size Hardening in Mg and Mg-Zn Solid Solutions

Grain Size Hardening in Mg and Mg-Zn Solid Solutions

Study on Microstructure and Properties of Bimodal Structured Ultrafine-Grained Ferrite Steel

Effect of Titanium on Hot Deformation Behaviors of Boron Microalloyed Steel

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