Microstructure and Strengthening Mechanisms in an Ultrafine Grained Al-Mg-Sc Alloy Produced by Powder Metallurgy

Harrell, Tammy J.; Topping, Troy D.; Wen, Haiming; Hu, Tao; Schoenung, Julie M.; Lavernia, Enrique J.

doi:10.1007/s11661-014-2569-6

Cited by 56 publications

(41 citation statements)

References 90 publications

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“…Note here that s 0 of about 200 MPa has been reported for various stainless steels, [11,[25][26][27][28] and a of 0.6-0.7 is frequently used parameter to account the dislocation strengthening. [15,29,30] However, the value of K e ¼ 0.047 MPa m 0.5 is remarkably smaller than K y values of 0.15-0.4, which have been reported for Hall-Petch relationship. [11,28,[31][32][33] A decrease in the slope in Hall-Petch relationship has been observed in other studies on submicrocrystalline/nanocrystalline steels processed by large strain deformation.…”

Section: Strengthening Mechanismsmentioning

confidence: 65%

Effect of Severe Cold or Warm Deformation on Microstructure Evolution and Tensile Behavior of a 316L Stainless Steel

2015

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The deformation microstructures and mechanical properties of a 316L austenitic stainless steel subjected to large strain cold or warm plate rolling are studied. The cold or warm rolling was carried out at room temperature or 573 K, respectively, to different total true strains up to 3. The structural changes are characterized by the development of nanocrystalline structures with the transverse grain size of about 80 or 160 nm at room temperature or 573 K, respectively. The evolution of nanocrystalline structure under cold working conditions (room temperature) is assisted by the development of mechanical twinning and partial martensitic transformation that result in rapid grain refinement. The development of nanocrystalline structures during cold/warm working is accompanied by significant strengthening. The yield strength approaches 1 680 or 1 070 MPa after cold or warm rolling to a total strain of 3, respectively.

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Section: Strengthening Mechanismsmentioning

confidence: 65%

Effect of Severe Cold or Warm Deformation on Microstructure Evolution and Tensile Behavior of a 316L Stainless Steel

2015

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“…Thus, the value of α = 0.73 is obtained from Figure 7. It should be noted that almost the same values of α have been used for calculation of dislocation strengthening in various alloys [19][20][21][30][31][32]. Finally, the following expression for the yield strength of the present steel subjected to cold rolling can be obtained: …”

Section: Strengthening Mechanismsmentioning

confidence: 99%

Development of Nanocrystalline 304L Stainless Steel by Large Strain Cold Working

Odnobokova

Belyakov

Kaibyshev

2015

Metals

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Abstract:The microstructural changes leading to nanocrystalline structure development and the respective tensile properties were studied in a 304L stainless steel subjected to large strain cold rolling at ambient temperature. The cold rolling was accompanied by the development of deformation twinning and martensitic transformation. The latter readily occurred at deformation microshear bands, leading the martensite fraction to approach 0.75 at a total strain of 3. The deformation twinning followed by microshear banding and martensitic transformation promoted the development of nanocrystalline structure consisting of a uniform mixture of austenite and martensite grains with their transverse sizes of 120-150 nm. The developed nanocrystallites were characterized by high dislocation density in their interiors of about 3 × 10 15 m −2 and 2 × 10 15 m −2 in austenite and martensite, respectively. The development of nanocrystalline structures with high internal stresses led to significant strengthening. The yield strength increased from 220 MPa in the original hot forged state to 1600 MPa after cold rolling to a strain of 3.

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“…The lattice measurements of Figure 10 can be indexed to the 200 ( = 2.11Å) and 220 ( = 1.492Å) planes of the MgO phase. In previous studies, Mg(O,N) dispersoids have been observed in an UFG Al-Mg-Sc alloy produced by milling and ECAP consolidation [32]. Results of STEM analysis of the milled powders annealed at 330 ∘ C also indicate the presence of some Al-Mg-O (∼30-40 nm) phases as shown in Figure 11.…”

Section: Tem Results Of 01 Er Powder Although Some Changes In the Gmentioning

confidence: 61%

Thermal Stability of Cryomilled Al-Mg-Er Powders

Akinrinlola

Gauvin

Blais

et al. 2017

Journal of Nanomaterials

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In this study, the thermal stability of nanostructured Al-Mg alloy powders was investigated. Two alloy compositions, Al-5Mg-0.1Er and Al-5Mg-0.5Er (wt.%), were cryogenically milled for 30 h to produce nanostructured powders. The microstructure of the milled powders with increasing temperature was investigated by differential scanning calorimetry (DSC) with one-hour annealing performed at selected temperatures followed by X-ray diffraction (XRD) and electron microscopy analysis. Prolonged milling led to significant oxygen pick-up in the powders. The Al-5Mg-0.1Er powders experienced grain growth typical of cryomilled Al-Mg powders, while the Al-5Mg-0.5Er alloy showed improved thermal stability. An average grain size of ∼20 nm was observed up to 400 ∘ C (∼0.8 ) in the Al-5Mg-0.5Er powders, and abnormal growth at 550 ∘ C resulted in a maximum observed grain size of 234 nm. Thermal stability in the Al-Mg-Er powders is attributed to the combined effects of solute/impurity drag and second-phase pinning (nanoscale oxides, nitrides, and oxynitrides) that impede grain boundary motion.

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Microstructure and Strengthening Mechanisms in an Ultrafine Grained Al-Mg-Sc Alloy Produced by Powder Metallurgy

Cited by 56 publications

References 90 publications

Effect of Severe Cold or Warm Deformation on Microstructure Evolution and Tensile Behavior of a 316L Stainless Steel

Effect of Severe Cold or Warm Deformation on Microstructure Evolution and Tensile Behavior of a 316L Stainless Steel

Development of Nanocrystalline 304L Stainless Steel by Large Strain Cold Working

Thermal Stability of Cryomilled Al-Mg-Er Powders

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