Deformation structures and strengthening mechanisms in an Al-Cu alloy subjected to extensive cold rolling

Zuiko, Ivan; Kaibyshev, Rustam

doi:10.1016/j.msea.2017.07.001

Cited by 68 publications

(46 citation statements)

References 66 publications

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“…Krishna et al [ 130 ] insisted that the dislocation strengthening was not the major contribution, while the grain boundary strengthening played a more important role in the increased strength. As reported by Zuiko, [ 131 ] the dislocation density of cold rolled Al–Cu alloy could be increased by a hundredfold after the initial reduction of 40%, but did not change much for further processing. Li et al [ 132 ] reported that the low‐temperature ageing resulted in a higher strength of cryorolled Al–Cu–Li alloy due to the nanoscale precipitations.…”

Section: Strengthening Mechanism Of Cryogenic Processingsupporting

confidence: 63%

Development of High Performance of Al Alloys via Cryo‐Forming: A Review

Xiong

Su²,

Kong

et al. 2021

Adv Eng Mater

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Weight reduction is a major trend in the development of automotive, marine, and aerospace industry. Al alloys are the ideal choice for the lightweight design because of their superior mechanical properties and small mass density. In recent years, research results have demonstrated that plastic processing at cryogenic temperature can improve the mechanical properties of Al alloys. Herein, the mechanical properties of Al alloys at cryogenic environment as well as at room temperature are compared, and then the main progress is introduced in the development of fabrication of high‐performance Al alloys using cryo‐forming methods, such as cryorolling, asymmetric cryorolling, cryo‐extrusion, and cryo‐forging, with subsequent heat treatment. The grain refinement mechanism and the strengthening mechanism of Al alloys during various cryo‐forming processes are discussed. Finally, the potential development prospects of future researches in this field are proposed.

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Section: Strengthening Mechanism Of Cryogenic Processingsupporting

confidence: 63%

Development of High Performance of Al Alloys via Cryo‐Forming: A Review

Xiong

Su²,

Kong

et al. 2021

Adv Eng Mater

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“…Therefore, the strain is predominantly localized in blocks, whereas coarse laths are almost strain-free [42]. It is worth noting that the density of geometrically necessary dislocations is associated with the KAM value [43]. Both structural components have similar lattice dislocation densities, as calculated by TEM [12,37].…”

Section: Tempered Martensite Lath Structurementioning

confidence: 80%

On the origin of the superior long-term creep resistance of a 10% Cr steel

Mishnev

Dudova

Kaibyshev

2018

Materials Science and Engineering: A

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A low-nitrogen 10% Cr martensitic steel containing 3% Co and 0.008% B was shown to exhibit an extremely long creep rupture time of ∼4•10 4 h under an applied stress of 120 MPa at 650°C. The creep behavior and evolution of lath martensite structure and precipitates during creep at these conditions were studied. The main feature of the microstructure under long-term creep is retention of the lath structure until rupture. The following microstructural factors affecting the superior creep resistance were analyzed: (1) alloying by (W+Mo) elements; (2) particles of M 23 C 6 and Laves phases; (3) homogeneously distributed M(C,N) carbonitrides. It was revealed that nanoscale M 23 C 6 carbides and M(C,N) carbonitrides compensated the negative effects of W depletion from the solid solution and extensive coarsening of the Laves phase particles. M 23 C 6 carbides demonstrate a high coarsening resistance under creep conditions and exert a high Zener drag pressure before rupture because of the coherency of their interfaces. The strain-induced transformation of a portion of the precipitated V-rich M(C,N) carbonitrides to the Z-phase does not affect the creep strength because the Z-phase particles are nanoscale and negligible in quantity.

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“…The above analysis shows both the model for volume-averaged dislocation and grain boundary (GB) creation as well as experimental data show that in SPD processed materials there is a strong non-causal correlation between d and ig, such that strength will always show a strong positive correlation with d -1/2 even if GB strengthening is a minor strengthening effect. Also other works have shown a strong correlation between modelled GB strengthening and dislocation strengthening for deformed metals and alloys [7,18,26,27,28,29]. This non-causal effect can only be eliminated if a complete recovery treatment is performed, i.e.…”

Section: Discussionmentioning

confidence: 98%

Dislocation versus grain boundary strengthening in SPD processed metals: Non-causal relation between grain size and strength of deformed polycrystals

Starink

2017

Materials Science and Engineering: A

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In metals that are heavily cold deformed, for instance by a severe plastic deformation process, significant strengthening is caused by the high density of defects such as grain boundaries and dislocations. In this work a model for volume-averaged dislocation and grain boundary (GB) creation is used to show that unless significant annihilation of defects post deformation occurs, the dislocation densities and GB densities in the deformed material are closely correlated. The dislocation strengthening effect thus shows a strong correlation with GB strengthening, and correlation of strength or hardness with d 1/2 , where d is the grains size, as in a Hall-Petch type plot, can not be taken as an indication that GB strengthening dominates. Instead, in many SPD processed metals and alloys, dislocation strengthening is the dominant strengthening effect, even though a Hall-Petch type plot shows a good linear correlation.

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Deformation structures and strengthening mechanisms in an Al-Cu alloy subjected to extensive cold rolling

Cited by 68 publications

References 66 publications

Development of High Performance of Al Alloys via Cryo‐Forming: A Review

Development of High Performance of Al Alloys via Cryo‐Forming: A Review

On the origin of the superior long-term creep resistance of a 10% Cr steel

Dislocation versus grain boundary strengthening in SPD processed metals: Non-causal relation between grain size and strength of deformed polycrystals

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