Influence of Twin Thickness and Grain Size on the Tensile Behavior of Fully Nanotwinned CuAl Alloys

Heckman, Nathan M.; Velasco, Leonardo; Hodge, Andrea M.

doi:10.1002/adem.201500496

Cited by 20 publications

(7 citation statements)

References 35 publications

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“…For NT Cu-Al alloys, the hardness increases as the Al content increases from 2wt.% to 6wt.%. This is consistent with tensile test results of NT Cu-Al alloys, which show an increased tensile strength with higher Al content [24]. The modulus of Cu alloy is higher than that of pure copper.…”

Section: Methodssupporting

confidence: 91%

Sliding wear behavior of fully nanotwinned Cu alloys

et al. 2018

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Highly nanotwinned (NT) metals have advantages such as high strength, good ductility, favorable corrosion resistance, and thermal stability. It has been demonstrated that the introduction of high density NT microstructures can enhance the tribological properties of metals. However, the influence of the microstructure and the composition of NT alloys on the tribological behavior are not clear. In this work, the sliding wear behavior of fully NT materials, specifically Cu-Al and Cu-Ni alloys, are studied by a nanoscratch technique using a nanoindenter. The effects of microstructure and chemical composition on the wear properties are also studied. The results show that the chemical composition has an obvious influence on the wear resistance and microstructural deformation. For NT Cu-Al alloys, the hardness and sliding wear resistance improve with increased Al content from Cu-2wt.%Al to Cu-6wt.%Al. NT Cu-10wt.%Ni alloy shows even better wear resistance than Cu-6wt.%Al. The microstructural analysis shows that NT Cu alloys with higher wear resistance correspond to a smaller deformation-affected zone. The improvement of sliding wear properties of Cu-Al alloys with higher Al content may be ascribed to their decreased stacking fault energy. NT Cu-Ni alloy shows better wear resistance than Cu-Al alloy, this may be related to the formation of intermetallic compounds in Cu-Al system. This study broadens the knowledge about tribological properties of NT materials and provides a potential method to optimize their sliding wear resistance by altering the chemical composition of NT Cu alloys.

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Section: Methodssupporting

confidence: 91%

Sliding wear behavior of fully nanotwinned Cu alloys

et al. 2018

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“…In crystalline solids, the propensity for twin boundary (TB) formation is highly correlated to the stacking fault energy (SFE) of the material; the lower the SFE, the higher the probability for TB formation [1]. In the case of low to intermediate SFE (< 45 mJ/m 2 ) metals such as Ag, Cu or Cualloys, films with a high density of TBs have been successfully synthesized by a variety of methods [1][2][3][4][5][6][7][8]. The inclusion of TBs in the film microstructure for low-intermediate SFE metals has shown a direct impact on the properties of the material, where the mechanical, thermal, and chemical properties are enhanced [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of low to intermediate SFE (< 45 mJ/m 2 ) metals such as Ag, Cu or Cualloys, films with a high density of TBs have been successfully synthesized by a variety of methods [1][2][3][4][5][6][7][8]. The inclusion of TBs in the film microstructure for low-intermediate SFE metals has shown a direct impact on the properties of the material, where the mechanical, thermal, and chemical properties are enhanced [1][2][3][4][5][6][7][8]. These improved properties have increased the working space of nanotwinned (nt) metals and contribute to the development of fundamental research for material's behavior at the nanoscale, particularly in low SFE metals with high TBs density [2,5,[9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Growth twins in high stacking fault energy metals: Microstructure, texture and twinning

Velasco

Hodge

2017

Materials Science and Engineering: A

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This work explores the formation of twin boundaries in high stacking fault energy metals (SFE > 125 mJ/m 2 ) by synthesizing thick films (> 10 μm) of Al, Al-5.3wt.%Mg, and Ni using magnetron sputtering. We report the observation of twin boundaries that are inclined with respect to the film growth direction across the entire thickness of the films. The formation of these inclined twin boundaries results in localized changes in the texture of the columnar grains.Microstructural analysis revealed that the fraction of twinned grains in the Al film (46%) is four times higher compared to other similar studies in Al, while the Al-5.3wt.%Mg and Ni films can be considered highly twinned since the fraction of twinned grains is 70% and 90%, respectively.The experimental observations provide an explanation on the formation of twin boundaries during the synthesis of the films, and emphasize that, in addition to stacking fault energy restrictions, high grain boundary mobility is a limiting factor on the nucleation of twin boundaries.

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“…Nevertheless, a good combination of hardness/ductility (6.2 GPa/6.3%) is achieved in the Cu-5 at.% Al film, which can be ascribed to the combined effect of texture and nanotwins [92]. At the same time, Heckman and coworkers [93] synthesized fully NT Cu-Al alloyed thin films with columnar grains and showed an increased strength of up to ~1.5 GPa that was closely related to the decrease in grain size or increase in Al content. Moreover, the ductility could be improved with decreasing the nanotwin thickness [93].…”

Section: Alloying Effects On Microstructure and Mechanical Propertiesmentioning

confidence: 98%

“…tuned: The nucleation of partial dislocations, for instance, is stimulated by miscible solutes through markedly decreasing the SFE of the host metal [91]. For example, as NS Cu films is alloyed with Al, more nanotwins with thinner thickness are observed in the as-deposited Cu-Al thin films with lower SFE or higher fraction of Al [92,93]. Recently, NS Cu films with different Al additions (0, 1, 5, and 10 at.%) were prepared by MS to investigate the effect of lowering SFE on microstructures and mechanical properties by Zhang et al [92].…”

Section: Alloying Effects On Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Grain Boundary Segregation in Nanocrystructured Metallic Materials

Zhang¹,

Liu²,

Sun³

2017

Study of Grain Boundary Character

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The aim of this chapter is to shed light on the effects of grain boundary segregation on microstructural evolution in nanostructured metallic materials as well as on their mechanical properties. Several key topics will be covered. First, a brief explanation of mechanical stress-driven grain growth in nanostructured Al, Ni, and Cu thin films will be provided in terms of a deformation mechanism map. It will become clear that the excess energy of grain boundaries enable the nanostructured metals to suffer from significant microstructure evolution via dislocation-boundary interactions during plastic deformation even at room temperature. Manipulation of grain boundary structures/properties via dopants segregation at grain boundaries to inhibit grain coalescence associated with remarkably enhanced mechanical properties is then discussed in three representative binary Cu-based systems, i.e., Cu-Zr, Cu-Al, and Cu-W. This is finally followed by a summary of this chapter.

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Influence of Twin Thickness and Grain Size on the Tensile Behavior of Fully Nanotwinned CuAl Alloys

Cited by 20 publications

References 35 publications

Sliding wear behavior of fully nanotwinned Cu alloys

Sliding wear behavior of fully nanotwinned Cu alloys

Growth twins in high stacking fault energy metals: Microstructure, texture and twinning

Grain Boundary Segregation in Nanocrystructured Metallic Materials

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