Brittle behavior of a dilute copper-beryllium alloy at 200°C in air

Misra, R.D.K.; McMahon, C.J.; Guha, A.

doi:10.1016/0956-716x(94)90058-2

Cited by 33 publications

(16 citation statements)

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“…There is a dependence of the embrittlement phenomenon on the prior time-temperature history of the material: this is simply related to the need for the embrittling species to migrate to the grain boundary or other site of fracture initiation for it to have an effect 8,199,203,[206][207][208][209][210][211] . Because decreasing temperature tends to increase the segregation driving force and decrease the segregation rate (which is generally limited by the rate of diffusion of atoms, either in the bulk or along grain boundaries), segregation effects are most visible in a certain intermediate range of temperatures.…”

Section: Grain Boundary Embrittlementmentioning

confidence: 99%

Intermediate temperature embrittlement of copper alloys

Laporte¹,

Mortensen²

2009

International Materials Reviews

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Copper and its alloys generally display a severe reduction in ductility between roughly 300°C and 600°C, a phenomenon variously called "intermediate temperature embrittlement" or "ductility trough behaviour". This review of the phenomenon begins by placing it in the wider context of the high-temperature fracture of metals, showing how its occurrence can be rationalized in simple terms on the basis of what is known of intergranular creep fracture and dynamic recrystallisation. Data in the literature are reviewed to identify main causes and mechanisms for embrittlement, first for pure copper, and then for monophase and multiphase copper alloys. Coverage then turns to the "grain boundary embrittlement" phenomenon, caused by the intergranular segregation of even minute quantities of alloying additions or impurities, which appears to worsen dramatically the intermediate temperature embrittlement of copper alloys. Finally, metal-induced embrittlement, including in particular liquid metal embrittlement, is presented as a second mechanism leading to an exacerbation of the intermediate temperature embrittlement of copper and its alloys.

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Section: Grain Boundary Embrittlementmentioning

confidence: 99%

Intermediate temperature embrittlement of copper alloys

Laporte¹,

Mortensen²

2009

International Materials Reviews

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“…This is an increase of about four. [59] Liu and White studied slow crack growth in Ni 3 Al at 600 ЊC. [56] Bika and McMahon used a similar analysis to describe slow grain boundary crack growth at 550 ЊC to 600 ЊC in low-alloy steel doped with 0.012 pct sulfur.…”

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confidence: 99%

Grain boundary cracking

Shewmon¹

1998

Metall Mater Trans A

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A chronological summary is given of the various types of grain boundary fracture found in metals. In each case, there is an impurity that adsorbs at the new (fracture) surface being formed. For the case of Fe-P alloys, a quantitative argument can show that adsorption of phosphorous on the free surface greatly reduces the barrier to void nucleation compared to that in the absence of phosphorous. The same or larger reduction would appear for any other element, which adsorbs more strongly than phosphorous and displaces it at the surface. Such an argument is shown to explain a great many cases of dimpled grain boundary fracture in strong alloys undergoing creep or hydrogen attack. The reduction in surface energy can also lead to a smooth grain boundary fracture (no void nucleation), in which diffusion of solute to the new surface limits crack growth. Numerous examples of this are also discussed.

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“…46 -48,57,58 This 'stress-driven diffusion' of the embrittling element leading to intergranular decohesion has been observed in Cu-Sn, 46 -48 Cu-Be, 57 Cu-Cr, 58,59 and Fe-V 60 alloys. The intergranular facets contained striations consistent with quasi-static, stepwise crack growth of the type expected in dynamic embrittlement.…”

Section: Effects Of Applied Tensile Stress On Grain Boundary Segregatmentioning

confidence: 89%

Grain boundary segregation and fracture resistance of engineering steels

Misra

2001

Surface & Interface Analysis

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The developments in surface analytical techniques and experimental measurements have made it possible to understand grain boundary segregation processes and related fracture mechanisms. This article shows how experimental contributions have led to the concept of grain boundary segregation isotherms for a complete understanding of grain boundary segregation behavior, and its effect on material properties in terms of the kinetics of segregation, the interaction processes amongst trace and solute elements and the influence of solute elements, heat treatment practice and applied tensile stress on grain boundary segregation processes. The determining role of grain boundary chemistry in obtaining a marked improvement in toughness of engineering steels at the specified levels of strength is elucidated here.

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Brittle behavior of a dilute copper-beryllium alloy at 200°C in air

Cited by 33 publications

References 0 publications

Intermediate temperature embrittlement of copper alloys

Intermediate temperature embrittlement of copper alloys

Grain boundary cracking

Grain boundary segregation and fracture resistance of engineering steels

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