Plasticity in multiphase intermetallics

Misra, Amit; Gíbala, R.

doi:10.1016/s0966-9795(00)00079-0

Cited by 108 publications

(29 citation statements)

References 32 publications

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“…Many attempts have been made to improve the room temperature ductility of NiAl by investigating the effects of microalloying, macroalloying and reinforcing the ductile second phase [3][4][5][6][7][8][9]. Despite these attempts, room temperature brittleness is still a key problem for the applications of NiAl.…”

Section: Introductionmentioning

confidence: 99%

First-principles investigation of the effects of B impurities on the mechanical properties of NiAl intermetallics

Liu

et al. 2011

Sci. China Phys. Mech. Astron.

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We have investigated the effects of B impurities on the structure and mechanical properties of NiAl intermetallics by using a first-principles pseudopotential total-energy method, based on the density functional theory with a generalized gradient approximation. We found that the impurity B atoms can either replace Ni atoms or Al atoms or both, depending on the surrounding environment. We demonstrated that the presence of B will cause an increase in brittleness and a decrease in the ductility of NiAl for the Al-substitutional case, while causing an increase in the ductility of NiAl for the Ni-subtitutional case, based on the calculated elastic constants and the empirical criterions. This indicates that the effects of B impurities on the mechanical properties of NiAl intermetallics are quite composition-dependent.

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Section: Introductionmentioning

confidence: 99%

First-principles investigation of the effects of B impurities on the mechanical properties of NiAl intermetallics

Liu

et al. 2011

Sci. China Phys. Mech. Astron.

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“…More recently these conditions have been shown applicable to interfaces between different materials or phases. [8][9][10][11] Hoagland et al 12 have demonstrated that the stress transmission through a semi-coherent (or nearly incoherent) bi-material boundary is affected by the core structure of misfit dislocations in the boundary. Spreading of the core can lead to a boundary that has increased mobility of misfit dislocations and concomitant weakening of the boundary in shear.…”

Section: Modelingmentioning

confidence: 99%

Determining the mechanical constitutive properties of metals as a function of strain rate and temperature: A combined experimental and modeling approach; Progress Report for 2004

Robertson¹,

Beaudoin²,

Lambros³

2005

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Determining the mechanical constitutive properties of metals as a function of strain rate and temperature: A combined experimental and modeling approach Progress report for 2004Development and validation of constitutive models for polycrystalline materials subjected to high strain rate loading over a range of temperatures are needed to predict the response of engineering materials to in-service type conditions (foreign object damage, high-strain rate forging, high-speed sheet forming, deformation behavior during forming, response to extreme conditions, etc.). To account accurately for the complex effects that can occur during extreme and variable loading conditions, requires significant and detailed computational and modeling efforts. These efforts must be closely coupled with precise and targeted experimental measurements that not only verify the predictions of the models, but also provide input about the fundamental processes responsible for the macroscopic response. Achieving this coupling between modeling and experimentation is the guiding principle of this program. Specifically, this program seeks to bridge the length scale between discrete dislocation interactions with grain boundaries and continuum models for polycrystalline plasticity. Achieving this goal requires incorporating these complex dislocation-interface interactions into the well-defined behavior of single crystals. Despite the widespread study of metal plasticity, this aspect is not well understood for simple loading conditions, let alone extreme ones. Our experimental approach includes determining the high-strain rate response as a function of strain and temperature with post-mortem characterization of the microstructure, quasi-static testing of predeformed material, and direct observation of the dislocation behavior during reloading by using the in situ transmission electron microscope deformation technique. These experiments will provide the basis for development and validation of physically-based constitutive models, which will include dislocation-grain boundary interactions for polycrystalline systems. One aspect of the program will involve the direct observation of specific mechanisms of micro-plasticity, as these will indicate the boundary value problem that should be addressed. This focus on the pre-yield region in the quasi-static effort (the elasto-plastic transition) is also a tractable one from an experimental and modeling viewpoint. In addition, our approach will minimize the need to fit model parameters to experimental data to obtain convergence. These are critical steps to reach the primary objective of simulating and modeling material performance under extreme loading conditions. To achieve these goals required assembling a multidisciplinary team, see Table 1, with key collaborators at the National Laboratories. One of the major issues for the team members was to learn about the expertise available and how to communicate across disciplines. The communication issue is a challenging one and is being addressed in part with weekly ...

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“…Like the harmful r phase in Ni-base superalloys, martensitic stainless steels, and many other heat-resistant high alloying steels, the single-phase Cr 13 Ni 5 Si 2 is also so brittle that it has little significance for practical applications as a bulk wear-resistant material. It is demonstrated that one of the most effective methods to enhance the toughness and ductility for many intermetallic alloys is the in-situ incorporation of a ductile second phase [14][15][16][17][18] via multicomponent alloying. The Ni-base solid solution (c) is well known for its excellent combination of ductility, toughness, oxidation resistance, high-temperature strength, and corrosion resistance when dissolved with high contents of Cr and Si.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ni Content on the Microstructure and Dry Sliding Wear Properties of Cr13Ni5Si2/γ Intermetallic Alloys

Fang

Wang

2007

Metall Mater Trans A

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The effect of Ni content on microstructure, hardness, and wear resistance was studied for the Cr 13 Ni 5 Si 2 -base intermetallic alloys toughened by Ni-base solid solution (c). Volume fraction and microhardness of the Cr 13 Ni 5 Si 2 primary dendrite as well as the average hardness of the Cr 13 Ni 5 Si 2 /c alloy decrease with the increasing Ni content. The Cr 13 Ni 5 Si 2 /c alloys have excellent wear resistance under dry sliding wear test conditions, which increases under high contact load wear conditions and decreases under low contact load wear test conditions with the increasing Ni content. The high wear resistance is due to the combination of high toughness of c and high hardness of Cr 13 Ni 5 Si 2 and formation of a transferred cover layer on the worn surface during wear process. The wear rate of the Cr 13 Ni 5 Si 2 /c alloy is governed by the slow process of microspalling or pullout of the cracked Cr 13 Ni 5 Si 2 primary dendrites. The Cr 13 Ni 5 Si 2 /c alloys have extremely low load sensitivity of wear and the load-sensitivity coefficient of wear decreases drastically as the Ni content increases.

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Plasticity in multiphase intermetallics

Cited by 108 publications

References 32 publications

First-principles investigation of the effects of B impurities on the mechanical properties of NiAl intermetallics

First-principles investigation of the effects of B impurities on the mechanical properties of NiAl intermetallics

Determining the mechanical constitutive properties of metals as a function of strain rate and temperature: A combined experimental and modeling approach; Progress Report for 2004

Influence of Ni Content on the Microstructure and Dry Sliding Wear Properties of Cr13Ni5Si2/γ Intermetallic Alloys

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