The Experts below are selected from a list of 17598 Experts worldwide ranked by ideXlab platform
Tadashi Furuhara - One of the best experts on this subject based on the ideXlab platform.
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yielding behaviour and hall petch Relationship in ultrafine grained al mg binary alloys
Materials Science and Technology, 2021Co-Authors: Naoya Kamikawa, Toyohisa Hirooka, Tadashi FuruharaAbstract:This study investigates yielding behaviour, Hall–Petch Relationship and strengthening mechanism of ultrafine-grained Al–Mg binary alloys. Ultrafine-grained Al–Mg samples reveal unusual discontinuou...
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Yielding behaviour and Hall–Petch Relationship in ultrafine-grained Al–Mg binary alloys
Materials Science and Technology, 2021Co-Authors: Naoya Kamikawa, Toyohisa Hirooka, Tadashi FuruharaAbstract:This study investigates yielding behaviour, Hall–Petch Relationship and strengthening mechanism of ultrafine-grained Al–Mg binary alloys. Ultrafine-grained Al–Mg samples reveal unusual discontinuou...
Elena G Astafurova - One of the best experts on this subject based on the ideXlab platform.
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effect of stacking fault energy on hall petch Relationship parameters of austenitic stainless steels
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019, 2019Co-Authors: S V Astafurov, Galina G Maier, Evgenii V Melnikov, Valentina A Moskvina, Marina Yu Panchenko, Elena G AstafurovaAbstract:Influence of stacking fault energy on parameters of Hall–Petch Relationship was analyzed. It was shown that dependence of a yield strength on the grain size for AISI 316 and AISI 321 austenitic stainless steels with different stacking-fault energies obeys Hall–Petch Relationship. Parameters of Hall–Petch Relationship depend on stacking fault energy (chemical composition) of the steel, which influences the peculiarities of dislocation arrangement. AISI 321 steel with lower value of stacking fault energy demonstrates higher value of Hall–Petch coefficient in comparison with AISI 316 steel with higher stacking fault energy.
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Effect of stacking fault energy on Hall–Petch Relationship parameters of austenitic stainless steels
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019, 2019Co-Authors: S V Astafurov, Galina G Maier, Evgenii V Melnikov, Valentina A Moskvina, Marina Yu Panchenko, Elena G AstafurovaAbstract:Influence of stacking fault energy on parameters of Hall–Petch Relationship was analyzed. It was shown that dependence of a yield strength on the grain size for AISI 316 and AISI 321 austenitic stainless steels with different stacking-fault energies obeys Hall–Petch Relationship. Parameters of Hall–Petch Relationship depend on stacking fault energy (chemical composition) of the steel, which influences the peculiarities of dislocation arrangement. AISI 321 steel with lower value of stacking fault energy demonstrates higher value of Hall–Petch coefficient in comparison with AISI 316 steel with higher stacking fault energy.
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The strain-rate dependence of the Hall-Petch effect in two austenitic stainless steels with different stacking fault energies
Materials Science and Engineering: A, 2019Co-Authors: S V Astafurov, Galina G Maier, Evgenii V Melnikov, Valentina A Moskvina, Marina Yu Panchenko, Elena G AstafurovaAbstract:Abstract Using thermal-mechanical treatments, specimens with different grain sizes were produced for two Cr-Ni-based austenitic stainless steels with different stacking fault energies (analogues of AISI 316L and AISI 321 steels). The effect of strain-rate on the tensile deformation behavior and strength properties was evaluated for these steels. In given grain size interval, (3–73)μm for 316 steel and (0.2–32)μm for 321 steel, the yield strength σ 0.2 varies with grain size D in accordance with Hall-Petch Relationship σ 0.2 = σ 0 + k H P D − 1 / 2 . The Hall-Petch coefficient kHP depends on steel composition (stacking fault energy) and possesses higher value for 321 steel as compared to 316 steel. Increase in strain-rate in the interval of 1.0 × 10−4 s−1 to 1.0 × 10−2 s−1 causes growth in stress σ0, but weakly changes coefficient kHP in Hall-Petch Relationship: 322–327 MPa × m0.5 for 316 steel and 404–413 MPa × m0.5 for 321 steel. The strain-rate dependence of the constants in Hall-Petch Relationship was discussed in terms of deformation mechanism and dislocation arrangement in both steels.
Terence G Langdon - One of the best experts on this subject based on the ideXlab platform.
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Ultrafine grains and the Hall-Petch Relationship in an Al-Mg-Si alloy processed by high-pressure torsion
Materials Science and Engineering: A, 2012Co-Authors: Aicha Loucif, Roberto B. Figueiredo, Thierry Baudin, François Brisset, R. Chemam, Terence G LangdonAbstract:Abstract Experiments were conducted to evaluate the evolution of hardness and microstructure in a commercial Al–0.6% Mg–0.4% Si alloy during processing by high-pressure torsion (HPT). The HPT was conducted under a pressure of 6.0 GPa and disks were torsionally strained to a maximum of 20 turns. It is shown that processing by HPT leads to microstructural refinement with an average grain size of ∼250 nm and to an increase in hardness up to a saturation value at equivalent strains above ∼100. There is a deviation in the Hall–Petch Relationship at grain sizes smaller than ∼500 nm and this is consistent with an earlier suggestion that a breakdown may occur if there is an easy movement of the extrinsic dislocations in the non-equilibrium grain boundaries introduced by HPT processing.
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structural evolution and the hall petch Relationship in an al mg li zr alloy with ultra fine grain size
Acta Materialia, 1997Co-Authors: Minoru Furukawa, Yoshinori Iwahashi, Zenji Horita, Minoru Nemoto, Nikolai K Tsenev, R Z Valiev, Terence G LangdonAbstract:Abstract Experiments were conducted on an Al5.5% Mg2.2% Li0.12% Zr alloy to investigate the feasibility of introducing an ultra-fine grain size using equal-channel angular (ECA) pressing and of retaining an ultra-fine grain size at elevated temperatures. It is shown that ECA pressing is capable of reducing the grain size from an initial value of ∼ 400 μm to a value of ∼ 1.2 μm. However, the microstructure after ECA pressing is heterogeneous, with many areas of equiaxed grains having high angle grain boundaries and some regions of subgrains with boundaries having low angles of misorientation. Unlike earlier experiments on AlMg binary alloys, it is demonstrated that the grain size of the AlMgLiZr alloy is reasonably stable up to temperatures as high as ∼ 700 K because of the presence in the matrix of a fine dispersion of β′-Al 3 Zr precipitates. Microhardness data confirm the Hall-Petch Relationship for grain sizes above ∼ 2 μm produced by annealing at temperatures above ∼ 673 K, but the Hall-Petch Relationship breaks down at smaller grain sizes because of variations in the volume fraction of the δ′-Al 3 Li precipitates.
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microhardness measurements and the hall petch Relationship in an almg alloy with submicrometer grain size
Acta Materialia, 1996Co-Authors: M Furukawa, Zenji Horita, Minoru Nemoto, R Z Valiev, Terence G LangdonAbstract:Abstract An Al-3% Mg solid solution alloy was subjected to intense plastic deformation, using either equal-channel angular (ECA) pressing or torsion straining, to produce grain sizes in the submicrometer range. Static annealing at elevated temperatures led to grain growth and average grain sizes of up to > 100 μm. As-fabricated and statically annealed specimens were used to determine the variation in microhardness with grain size, and results confirm that the Hall-Petch Relationship persists down to at least the finest grain size examined experimentally (∼90 nm). The results provide no evidence to support the claims of a negative Hall-Petch slope when the average grain size is very small, but there is evidence of a decrease in the slope of the Hall-Petch plot at the very finest grain sizes (
Naoya Kamikawa - One of the best experts on this subject based on the ideXlab platform.
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yielding behaviour and hall petch Relationship in ultrafine grained al mg binary alloys
Materials Science and Technology, 2021Co-Authors: Naoya Kamikawa, Toyohisa Hirooka, Tadashi FuruharaAbstract:This study investigates yielding behaviour, Hall–Petch Relationship and strengthening mechanism of ultrafine-grained Al–Mg binary alloys. Ultrafine-grained Al–Mg samples reveal unusual discontinuou...
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Yielding behaviour and Hall–Petch Relationship in ultrafine-grained Al–Mg binary alloys
Materials Science and Technology, 2021Co-Authors: Naoya Kamikawa, Toyohisa Hirooka, Tadashi FuruharaAbstract:This study investigates yielding behaviour, Hall–Petch Relationship and strengthening mechanism of ultrafine-grained Al–Mg binary alloys. Ultrafine-grained Al–Mg samples reveal unusual discontinuou...
S V Astafurov - One of the best experts on this subject based on the ideXlab platform.
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effect of stacking fault energy on hall petch Relationship parameters of austenitic stainless steels
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019, 2019Co-Authors: S V Astafurov, Galina G Maier, Evgenii V Melnikov, Valentina A Moskvina, Marina Yu Panchenko, Elena G AstafurovaAbstract:Influence of stacking fault energy on parameters of Hall–Petch Relationship was analyzed. It was shown that dependence of a yield strength on the grain size for AISI 316 and AISI 321 austenitic stainless steels with different stacking-fault energies obeys Hall–Petch Relationship. Parameters of Hall–Petch Relationship depend on stacking fault energy (chemical composition) of the steel, which influences the peculiarities of dislocation arrangement. AISI 321 steel with lower value of stacking fault energy demonstrates higher value of Hall–Petch coefficient in comparison with AISI 316 steel with higher stacking fault energy.
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Effect of stacking fault energy on Hall–Petch Relationship parameters of austenitic stainless steels
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS WITH HIERARCHICAL STRUCTURE FOR NEW TECHNOLOGIES AND RELIABLE STRUCTURES 2019, 2019Co-Authors: S V Astafurov, Galina G Maier, Evgenii V Melnikov, Valentina A Moskvina, Marina Yu Panchenko, Elena G AstafurovaAbstract:Influence of stacking fault energy on parameters of Hall–Petch Relationship was analyzed. It was shown that dependence of a yield strength on the grain size for AISI 316 and AISI 321 austenitic stainless steels with different stacking-fault energies obeys Hall–Petch Relationship. Parameters of Hall–Petch Relationship depend on stacking fault energy (chemical composition) of the steel, which influences the peculiarities of dislocation arrangement. AISI 321 steel with lower value of stacking fault energy demonstrates higher value of Hall–Petch coefficient in comparison with AISI 316 steel with higher stacking fault energy.
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The strain-rate dependence of the Hall-Petch effect in two austenitic stainless steels with different stacking fault energies
Materials Science and Engineering: A, 2019Co-Authors: S V Astafurov, Galina G Maier, Evgenii V Melnikov, Valentina A Moskvina, Marina Yu Panchenko, Elena G AstafurovaAbstract:Abstract Using thermal-mechanical treatments, specimens with different grain sizes were produced for two Cr-Ni-based austenitic stainless steels with different stacking fault energies (analogues of AISI 316L and AISI 321 steels). The effect of strain-rate on the tensile deformation behavior and strength properties was evaluated for these steels. In given grain size interval, (3–73)μm for 316 steel and (0.2–32)μm for 321 steel, the yield strength σ 0.2 varies with grain size D in accordance with Hall-Petch Relationship σ 0.2 = σ 0 + k H P D − 1 / 2 . The Hall-Petch coefficient kHP depends on steel composition (stacking fault energy) and possesses higher value for 321 steel as compared to 316 steel. Increase in strain-rate in the interval of 1.0 × 10−4 s−1 to 1.0 × 10−2 s−1 causes growth in stress σ0, but weakly changes coefficient kHP in Hall-Petch Relationship: 322–327 MPa × m0.5 for 316 steel and 404–413 MPa × m0.5 for 321 steel. The strain-rate dependence of the constants in Hall-Petch Relationship was discussed in terms of deformation mechanism and dislocation arrangement in both steels.
