Improvement in ductility at intermediate temperatures by a small addition of yttrium in a Cu-30%Zn alloy

Kanno, Motohiro; Shimodaira, Noriaki

doi:10.1016/0036-9748(87)90288-2

Cited by 9 publications

(7 citation statements)

References 10 publications

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“…A reverse, "de-embrittling", effect is documented to result from the addition of certain elements, also noted to reduce the incidence of practical problems related to the ductility trough behaviour of copper: Zr 12,249,[262][263][264] , as well as Mg 146,175 , B 175,186 , Y [265][266][267] , Ce 266 , La 266 , Ca 266 , Nb 34 , Li 268 , U 264 and -but to a lesser extent -P 175 and Ti 12,186 . Foulger reports that Mg and Li improve the ductility of cupronickels at 900°C 21 .…”

Section: The Embrittlement Of Coppermentioning

confidence: 99%

“…14. The role of Zr, Y, Ce and La has been explained as being a result of their ability to scavenge sulphur 12,175,249,265,266 .…”

Section: The Embrittlement Of Coppermentioning

confidence: 99%

“…The role of Zr, Y, Ce and La has been explained as being a result of their ability to scavenge sulphur. 12,175,249,265,266 A comparison with nickel alloys is interesting. In addition to the strongly detrimental element sulphur, in nickel the elements Se, Sn, Te, Tl, Pb, Bi are documented embrittlers, while the elements Ti, Zr, Hf, La, Y, Mg, B, Ca, Nd and Ce are documented to be beneficial additions.…”

Section: Of Ref 118mentioning

confidence: 99%

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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: The Embrittlement Of Coppermentioning

confidence: 99%

“…14. The role of Zr, Y, Ce and La has been explained as being a result of their ability to scavenge sulphur 12,175,249,265,266 .…”

Section: The Embrittlement Of Coppermentioning

confidence: 99%

Section: Of Ref 118mentioning

confidence: 99%

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Intermediate temperature embrittlement of copper alloys

Laporte¹,

Mortensen²

2009

International Materials Reviews

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“…nsatisfying ability to plastic deformation at elevated temperatures, mostly leading to the reduction of deformability and/or hot plasticity is characteristic for many metals and alloys [1][2][3][4]. The occurrence of hotshortness phenomenon, followed by the fracture of intercrystalline character is an important reason for U technological difficulties.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of plastic instability and fracture of compressed and tensile tested Mg-Li alloys investigated using the acoustic emission method

Pawełek¹,

Piątkowski²,

Wajda³

et al. 2015

Frattura Ed Integrità Strutturale

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The results of the investigation of both mechanical and acoustic emission (AE) behaviors of Mg4Li5Al alloy subjected to compression and tensile tests at room temperature are compared with the test results obtained using the same alloy and loading scheme but at elevated temperatures. The main aim of the paper is to investigate, to determine and to explain the possible influence of factors related with enhanced internal stresses such as: segregation of precipitates along grain boundaries or solute atoms along dislocations (Cottrell atmospheres) or dislocation pile-ups at grain boundaries which create very high stress concentration leading to fracture. The results show that the plastic instabilities are related to the Portevin-Le Châtelier phenomenon (PL effect) and they are correlated with the generation of AE peaks. The fractography of breaking samples was analyzed on the basis of light (optical), TEM and SEM images.

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“…">IntroductionUnsatisfying ability to plastic deformation at elevated temperatures, mostly leading to the reduction of deformability and/or hot plasticity is characteristic for many metals and alloys [1][2][3][4]. The occurrence of hot-shortness phenomenon, followed by the fracture of intercrystalline character is an important reason for technological difficulties.…”

mentioning

confidence: 99%

Plastic Instabilities Induced by the Portevin - Le Châtelier Effect and Fracture Character of Deformed Mg-Li Alloys Investigated Using the Acoustic Emission Method

Pawełek

Piątkowski

Wajda

et al. 2016

Archives of Metallurgy and Materials

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IntroductionUnsatisfying ability to plastic deformation at elevated temperatures, mostly leading to the reduction of deformability and/or hot plasticity is characteristic for many metals and alloys [1][2][3][4]. The occurrence of hot-shortness phenomenon, followed by the fracture of intercrystalline character is an important reason for technological difficulties. Previous investigations of the authors of the paper [5][6][7][8][9] of mechanical properties of alloys with the application of AE method were devoted to the Mg-Li-Al alloys and related composites generally in the context of the method of intensive deformation processes leading to their excellent mechanical properties, such as great strength and plasticity or even superplasticity. On the other hand, the investigations of metal and alloy plastic instability using the AE technique were carried out [10][11][12] mainly in the context of basic aspects of PL effect, twinning or shear band in both poly-and single metal and alloy crystals. The fracture and strengthening properties of Mg-Li based alloys (and composites) were investigated, for example in [13][14][15][16], but without the use of AE method, which proved to be a very useful technique of material examination. In this work the results of the investigations of the correlation between the AE phenomenon, the plastic instability, induced by PL effect, twining or shear bands, and the both, intergranular and transcrystalline fracture of Mg4Li5Al and Mg4Li4Zn alloys subjected to tensile and compression tests at wide range of elevated temperatures are presented.Alloys based on magnesium with lithium, as the lightest ones from among the known metallic construction materials, are very attractive from the point of view of their application as the materials for light, yet durable constructions to be used in the automotive industry (e.g. car engine housings), light housings of computers and aerospace technology. The basic Mg-Li alloys exist in three phase areas. The hexagonal α phase appears in the concentration range of Li up to 4 wt.%. If the content of Li is more than 12 wt.% -the β phase of cubic lattice occurs. The alloys of Li content from 4% up to 12 wt.% form the α+β two-phase mixture. The mechanical properties of α phase are worse from that of the β phase, which is more plastic and thus reveals good machinability and weldability. Alloying additions, e.g. Al (or Zn) from 3% to 5%, slightly increase the density of the alloy, but lead to the precipitation of coherent particles of transition phase, θ-MgLi 2 Al/θ-MgLi 2 Zn, which additionally strengthens the matrix and leads to the improvement of mechanical properties [14]. The present paper addresses the optical microscopic, as well as TEM and SEM observations of the failure of samples after tensile and compression tests.

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Improvement in ductility at intermediate temperatures by a small addition of yttrium in a Cu-30%Zn alloy

Cited by 9 publications

References 10 publications

Intermediate temperature embrittlement of copper alloys

Intermediate temperature embrittlement of copper alloys

Mechanisms of plastic instability and fracture of compressed and tensile tested Mg-Li alloys investigated using the acoustic emission method

Plastic Instabilities Induced by the Portevin - Le Châtelier Effect and Fracture Character of Deformed Mg-Li Alloys Investigated Using the Acoustic Emission Method

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