The segregation of impurities to grain boundaries

Thomas, W.R.; Chalmers, B.

doi:10.1016/0001-6160(55)90005-5

Cited by 41 publications

(6 citation statements)

References 4 publications

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“…They studied the misorientation dependence of polonium segregation to <001> symmetric tilt boundaries in Pb-5%Bi alloy bicrystals by autoradiography (2).…”

Section: Structure-dependent Grain Boundary Segregation and Hardeningmentioning

confidence: 99%

Structural Effects on Grain Boundary Segregation, Hardening and Fracture

Watanabe

1985

J. Phys. Colloques

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Recent experimental studies of structural effects on grain boundary segregation, hardening and fracture in metals and alloys are discussed. It has been found that grain boundary segregation, hardening and fracture are difficult to occur at low angle boundaries and coincidence boundaries which are both low energy grain boundaries. On the other hand, high angle general (so called "random") boundaries can be preferential sites for these boundary phenomena. In polycrystals, their fracture mode and fracture behaviour have been found to depend on the grain boundary character distribution in them. Intergranular fracture will occur typically in a polycrystal with a high frequency of random boundaries. The grain boundary character distributions in real polycrystalline materials produced by different fabrication processes are discussed. A new idea " Grain Boundary Design " for strong and ductile polycrystals which has been proposed recently is mentioned briefly.

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“…They studied the misorientation dependence of polonium segregation to <001> symmetric tilt boundaries in Pb-5%Bi alloy bicrystals by autoradiography (2).…”

Section: Structure-dependent Grain Boundary Segregation and Hardeningmentioning

confidence: 99%

Structural Effects on Grain Boundary Segregation, Hardening and Fracture

Watanabe

1985

J. Phys. Colloques

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“…It is obvious that grain boundary segregation increases with increasing misorientation angle of the two adjoining grains from 0 = 0 (no boundary, single crystal) to 0 = 10... 15 ~ [61][62][63][64][65]. This increase is closely connected with densifying array of dislocations forming their structures.…”

Section: Orientation Dependence Of Grain Boundarymentioning

confidence: 96%

“…In some cases such as Si segregation in Fe [66], no apparent segregation of a weak segregant is observed. After the change of the grain boundary structure from the dislocation one to that formed by structural units, an abrupt change of the orientation dependence of grain boundary segregation can be observed [61 ]. Generally, these changes are more pronounced for tilt than for twist grain boundaries due to the different ability of edge and screw dislocations to accomodate foreign atoms [67].…”

Section: Orientation Dependence Of Grain Boundarymentioning

confidence: 99%

Solute segregation at grain boundaries

Hofmann¹,

Leiĉek

1996

Interface Sci

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This feature article summarizes the present art and science of grain boundary segregation from the viewpoint of the authors activities in this field. In the part on equilibrium segregation, fundamental effects on grain boundary segregation are discussed such as the nature of the solute/matrix binary system, presence of additional elements, temperature, grain boundary orientation and type of interface. In addition, the predictive capabilities of grain boundary segregation diagrams are outlined. The present models of segregation kinetics are reviewed and discussed in connection with recent experiment. The last part of the paper is focussed on the most important c3nsequences of grain boundary segregation, i.e., grain boundary cohesion and fracture.

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“…Hierbci niuR vorausgeschickt werden, dai3 bei plr 2 die Zink-Segregation, eventuell auch Arsen-Segregation an den Korngrenzen an, da sich an den Koriigrenzen Atcxne des gelosten Metalls ausscheiden, deren Ausmafle sich von denen der Losungsinittelatonie unterscheiden. Die leiclitere ktabarkeit einiger Korngrenzen in arsenfreieni a-Messing beruhte offensichtlich darauf, dafl dis Zinlrsegregation a n anderen Korngrenzen grofler war, da der Grad der Segregation von der relativen Orientierung der KorngriiDen abhangt (49). CuZn-Legierungen mit hijherem Zinkgehalt haben sowohl in Ammoniak (34) als auch in Chloridliisungen (6) ein niedrigeres Korrosionspotential; sie losen sich bei niedrigeren Potentialen anodisc11 auf und bilden festes CuCl bei hiiheren Stromdichten (6) 1st in der Legierung Arsen enthalten, dann fehlt die Disproportionierungsreaktion im Spalt (und auch an anderen Stellen).…”

Section: Diskussion Der Ergebnisseunclassified

“…Hcfi 12/1968 Bartonizek, Holinka die Zink-Segregation, eventuell auch Arsen-Segregation an den Korngrenzen an, da sich an den Koriigrenzen Atcxne des gelosten Metalls ausscheiden, deren Ausmafle sich von denen der Losungsinittelatonie unterscheiden. Die leiclitere ktabarkeit einiger Korngrenzen in arsenfreieni a-Messing beruhte offensichtlich darauf, dafl dis Zinlrsegregation a n anderen Korngrenzen grofler war, da der Grad der Segregation von der relativen Orientierung der KorngriiDen abhangt (49). CuZn-Legierungen mit hijherem Zinkgehalt haben sowohl in Ammoniak (34)…”

Section: Jahrgnngunclassified

Die Korrosion von Messing in Ammoniumchloridlösungen

Bartoníček¹,

Holinka²,

Lukasovská³

1968

Materials & Corrosion

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Es wurde das Korrosionsverhalten von Messing der Type Cu77ZnZlA12, mit und ohne Arsen, in 0,01 bis 1 m NH4Cl‐Lötsungen von PH 4 und 2 sowie in 1 M Cl−‐Lösungen mit veränderlicher Na+‐und N+4‐Konzentration (Gesarntkonzentration jeweils 1 m) bei PH 2 und 4 untersucht. Während arsenfreies Messing in den meisten Fällen entzinkt wurde, trat bei dem arsenhaltigen Messing in den moisten Fällen interkristalline Korrosion ein. Die interkristalline Korrosion wird bereits bei einem Gehalt von 0,01% As hervorgerufen. In einem Medium mit 1 m C1− findet bei PH 2 interkristalline Korrosion unabhängig vom Gehalt an Ammoniumionen statt, während bei PH 4 die interkristalline Korrosion erst bei höheren NH+4− Ionen‐Konzentration, praktisch Lei 1 m, auftritt. Als Ursache der interkristallinen Korrosion wurden die Ausscheidung von Zink bzw. Arsen an den Korngrenzen sowie der Einfluß des Arsens auf die Stabilität des durch die anodische Reaktion entstehendenden CuCl−2 ermittelt. Der Einfluß der Zusammensetzung der Lösung auf den zeitlichen Verlauf der interkristallinen Korrosion wird erklärt.

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The segregation of impurities to grain boundaries

Cited by 41 publications

References 4 publications

Structural Effects on Grain Boundary Segregation, Hardening and Fracture

Structural Effects on Grain Boundary Segregation, Hardening and Fracture

Solute segregation at grain boundaries

Die Korrosion von Messing in Ammoniumchloridlösungen

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