Anomalies in temperature dependence of mechanical properties and thermal expansion of age hardenable invar alloy Fe-40%Ni-0.8% Be

Gulyaev, A. A.; Svistunova, E. L.

doi:10.1016/1359-6462(96)00140-6

Cited by 8 publications

(5 citation statements)

References 4 publications

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“…23,24 These alloys would be expected to show the behaviour of cases (b) and (d) for a temperature increase and decrease, respectively. The situation would likely be followed by cases (a) or (c) given further loading or temperature change.…”

Section: Discussionmentioning

confidence: 99%

“…There is also a group of materials called invar alloys, such as FeNi and FeNiBe, which show anomalous temperature dependence of Young's modulus, where an increased temperature makes the modulus become greater, and vice versa. 23,24 These alloys would be expected to show the behaviour of cases (b) and (d) for a temperature increase and decrease, respectively. However, the variation in Young's modulus with temperature is generally quite small and the equivalent stress intensity factor change is only minor.…”

Section: Discussionmentioning

confidence: 99%

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Effect of a variation in material properties on the crack tip opening displacement

Codrington

Kotousov

Chang

2012

Fatigue Fract Eng Mat Struct

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This paper investigates the effect of a variation in material properties on the crack tip opening displacement, a parameter often used in the prediction of fatigue and fracture. This situation is typical when a component is subjected to a relatively slow temperature fluctuation or the material properties undergo direct changes, such as due to a phase transformation. An analytical strip‐yield model is developed using the small‐scale yielding assumption and theory of complex potentials. Four cases of crack tip plasticity behaviour are identified for the different combinations of parameters controlling the variation in material properties. Results of calculations over a wide range of material properties are presented and show a significant effect on the crack tip opening displacement. Finite element simulations are conducted to verify the analytical findings. The implications of the outcomes in relation to several practical situations are also discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of a variation in material properties on the crack tip opening displacement

Codrington

Kotousov

Chang

2012

Fatigue Fract Eng Mat Struct

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“…Various experimental data indicate a strong influence of the magnetic structure of ferromagnets on their plastic properties. Transition to a magnetically ordered state is accompanied by a strong change of plasticity (Zackay and Hazlett, 1953, Nabutovskaya, 1969,1971, Wolfenden, 1978, Bolling and Richman, 1969, Echigoya etal, 1973, Echigoya and Hayashi, 1979, Flor etal, 1980, Retat etal, 1985, Retat, 1987, Maksimova and Maiboroda, 1992, Gulayev and Svistunova, 1996. Measurements with small temperature intervals revealed an increase of plasticity in a close vicinity of the Curie point (Zackay and Hazlett, 1953, Nabu-tovskaya, 1969,1971, Wolfenden, 1978.…”

Section: Introductionmentioning

confidence: 97%

Plasticity of ferromagnets near the Curie point

Molotskii

Fleurov

2003

Philosophical Magazine

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We propose an explanation of the anomalous growth of plasticity in ferromagnets near the Curie point. We demonstrate that this effect is caused by spin-dependent detachment of dislocations from obstacles under the influence of the internal magnetic induction. Magnetization fluctuations grow in the vicinity of the Curie point, yielding an increase in the detachment probability and, hence, an increase in the plasticity. We apply this model to a description of the temperature behaviour of the critical stress in nickel and of the microhardness of gadolinium. An external magnetic field suppresses the magnetization fluctuations and, hence, may suppress the above singularities.

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“…MPa and 910 MPa respectively, but the thermal expansion performance is destroyed [3]. Therefore, sever plastic deformation (SPD) is applied to strengthen Fe-36%Ni alloy without sacrificing the low thermal expansion performance.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, cryorolling (CR) is getting more and more attention for it can 3 induce severe strain and continuous produce large specimens [6,7]. Wang et al [8] investigated the microstructure and mechanical properties of pure Cu after CR and subsequent annealing.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and tensile behavior of Fe-36%Ni alloy after cryorolling and subsequent annealing

Zheng

et al. 2016

Materials Science and Engineering: A

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In this paper, the microstructure and mechanical properties of Fe-36%Ni alloy after 90% reduction of cryorolling (CR) and subsequent annealing were investigated. The X-Ray diffraction (XRD) results indicated the existence of ,   phase transformation, and the measurement result of the ，  volume fraction was 15%. Lath ，  with average thickness of 29.3 nm was then observed by transmission electron microscope (TEM). After 90% reduction of CR, the ultimate strength (UTS) of the tested alloy was enhanced to 1100 MPa. This was mainly due to high density defects formation and ，  transformation during CR. After annealing at 823 K for 5 min, TEM results revealed that a multimodal grain structure was produced, the UTS of the tested alloy was decreased to 830 MPa, total elongation (EL) was increased to 8%. With the increasing of annealing time, the recrystallized grains were gradually coarsened and the volume fraction was increased. The increase of ductility was accompanied by the significantly decrease of strength. The cryorolled Fe-36%Ni alloy was fully recrystallized after annealing at 823 K for 30 min. The grain size distribution indicated that nearly 62% of the grains were less than 3 μm and there were a few large grains more than 10 μm. The recrystallized sample exhibited a +86 24 23906472. 2 good mechanical property with a higher tensile strength of 550 MPa and total EL of 36%, which was probably due to the bimodal microstructure.

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Anomalies in temperature dependence of mechanical properties and thermal expansion of age hardenable invar alloy Fe-40%Ni-0.8% Be

Cited by 8 publications

References 4 publications

Effect of a variation in material properties on the crack tip opening displacement

Effect of a variation in material properties on the crack tip opening displacement

Plasticity of ferromagnets near the Curie point

Microstructural and tensile behavior of Fe-36%Ni alloy after cryorolling and subsequent annealing

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