Misorientation characteristics of penetrating morphologies at the growth front of abnormally growing grains in aluminum alloy

Park, Chang‐Soo; Na, Tae‐Wook; Park, Hyung-Ki; Kim, Dongkyun; Han, Chanhee; Hwang, Nong‐Moon

doi:10.1080/09500839.2012.673020

Cited by 2 publications

(3 citation statements)

References 23 publications

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“…Hence, the AGG during the one-stage annealing could be a consequence of a discontinuous subgrain growth. 18 The mechanism of AGG, based on energy considerations and solid-state wetting, 19,20 assumes that low-angle subgrain boundaries of abnormal grains penetrate into the matrix by means of repeated events of triple-junction wetting. Although morphological features such as small island grains and small grain clusters within abnormal grains (Figures 1 and 4) resemble the morphology typical for triple-junction wetting, 19 they are commonly observed during AGG [9][10][11]19 and ascribed to dispersoid pinning.…”

Section: Discussionmentioning

confidence: 99%

“…Although morphological features such as small island grains and small grain clusters within abnormal grains (Figures 1 and 4) resemble the morphology typical for triple-junction wetting, 19 they are commonly observed during AGG [9][10][11]19 and ascribed to dispersoid pinning. 11 Whether the critical factor for AGG is the grain-boundary mobility, i.e., grains with mobile high-angle boundaries consuming the surrounding grains with low-angle low-mobility boundaries, 10 or the energy criterion and solid-state wetting 20 at this point remains a conjecture.…”

Section: Discussionmentioning

confidence: 99%

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Influence of cold-rolling deformation and annealing temperature on the grain growth of Al-4%Mg-Mn alloy

Radetić¹,

Popović²,

Romhanji³

2020

Mater. Tehnol.

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The propensity of an alloy toward an abnormal grain growth (AGG) severely limits the annealing temperature range, capability for hot forming, and deteriorates mechanical properties. In this work, the results of a study of the effect of thermo-mechanical processing (TMP) of Al-Mg alloy AA5182 on the AGG are reported. TMP included cold rolling with a reduction range of 40-85 % followed by isochronal annealing (1 h) in a temperature range of 350-520°C or isothermal treatment at 480°C for different periods of time. The microstructure was characterized using optical microscopy in polarized light and an FEG SEM. The results showed that an increase in the degree of reduction lowers the annealing temperature for the onset of the AGG, while an increase in the annealing temperature increases the extent of the AGG for a given cold reduction. The abnormal grains tended to form in the region close to the surface of the plates, and with extended annealing bands, develope parallel to the surfaces in the rolling direction. However, no appreciable grain growth occurred in the plate center. The AGG and grain-boundary mobility showed a strong anisotropy with a much faster lateral growth than the motion of the growth front normal to the plate surface. Such anisotropy was attributed to the rod-like shape and alignment of Al6Mn dispersoids through Zener pinning. Keywords: abnormal grain growth, thermo-mechanical processing, Al-Mg-Mn alloy Nagnjenost zlitin na osnovi aluminija k abnormalni rasti kristalnih zrn (AGG) mo~no omejuje temperaturno obmo~je, v katerem se lahko izvaja njeno rekristalizacijsko`arjenje in sposobnost za njeno preoblikovanje v vro~em, ker vse skupaj poslab{uje njene mehanske lastnosti. V prispevku avtorji predstavljajo {tudijo vpliva termo-mehanske obdelave (TMP) na abnormalno rast kristalnih zrn Al-Mg zlitine vrste AA5182. TMP je bila sestavljena iz hladnega valjanja s stopnjo redukcije med 40 % in 85 % in eno-urnega izohronega`arjenja v temperaturnem obmo~ju med 350°C in 520°C ali razli~no dolge izotermne obdelave pri 480°C. Mikrostrukturo zlitine so preiskovali z opti~nim mikroskopom v polarizirani svetlobi in v FEG SEM. Rezultati ka`ejo, da pove~ana stopnja redukcije zni`uje temperaturo`arjenja za za~etek AGG medtem, ko zvi{anje temperature`arjenja povi{uje obseg AGG za dano stopnjo redukcije. Abnormalna kristalna zrna nastajajo pod povr{ino plo{~in s podalj{evanjem~asà arjenja nastajajo njihovi trakovi vzporedno s povr{ino v smeri valjanja. Vendar pa niso zaznali znatne rasti zrn v sredini plo{~e oz. vzorca. AGG in mobilnost mej kristalnih zrn sta mo~no anizotropni z mnogo hitrej{o bo~no rastjo kot je hitrost rasti~ela pravokotno na povr{ino plo{~e. Tak{no anizotropijo lahko pripi{emo Zenerjevemu pripenjanju usmerjenih pali~astih izlo~kov Al6Mn. Klju~ne besede: abnormalna rast zrn, termo-mehanska obdelava, zlitina na osnovi Al-Mg-Mn

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Influence of cold-rolling deformation and annealing temperature on the grain growth of Al-4%Mg-Mn alloy

Radetić¹,

Popović²,

Romhanji³

2020

Mater. Tehnol.

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“…In the last few decades, there has been a dramatic proliferation of research related to the mechanism of crystal growth, since it affects the properties of crystal structure in the thermal annealing process [7][8][9][10][11][12][13][14][15][16][17]. A lot of research has been done in this field to observe large grain growth [18][19][20][21][22][23][24][25][26][27][28]. The extra-large grain growth in polycrystalline Cu is called abnormal grain growth.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Grain Growth in (111) Nanotwinned Cu Films by DC Electrodeposition

Shen

et al. 2019

Materials

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We have reported a method of fabricating (111)-orientated nanotwinned copper (nt-Cu) by direct current electroplating. X-ray analysis was performed for the samples annealed at 200 to 350 • C for an hour. X-ray diffraction indicates that the (200) signal intensity increases while (111) decreases. Abnormal grain growth normally results from transformation of surface energy or strain energy density. The average grain size increased from 3.8 µm for the as-deposited Cu films to 65-70 µm after the annealing at 250 • C for 1 h. For comparison, no significant grain growth behavior was observed by random Cu film after annealing for an hour. This research shows the potential for its broad electric application in interconnects and three-dimensional integrated circuit (3D IC) packaging.

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Misorientation characteristics of penetrating morphologies at the growth front of abnormally growing grains in aluminum alloy

Cited by 2 publications

References 23 publications

Influence of cold-rolling deformation and annealing temperature on the grain growth of Al-4%Mg-Mn alloy

Influence of cold-rolling deformation and annealing temperature on the grain growth of Al-4%Mg-Mn alloy

Anisotropic Grain Growth in (111) Nanotwinned Cu Films by DC Electrodeposition

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