Plastic deformation of the C14 Laves phase (Fe,Ni)2Nb

Takata, Naoki; Armaki, Hassan Ghassemi; Terada, Yoshihiro; Takeyama, Masao; Kumar, K.S.

doi:10.1016/j.scriptamat.2012.12.019

Cited by 52 publications

(35 citation statements)

References 22 publications

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“…Indeed, Krämer and Schulze [21] have reported -based on geometrical considerations -that deformation of Laves phases can occur by perfect dislocation glide of dislocations with a Burgers vector of 1 3 〈112 � 0〉 on basal and prismatic planes. This slip mode has been experimentally confirmed by several groups at temperatures above a homologous temperature of 0.6 Tm for the respective Laves phases [22,23,32,40]. As evident from Figure 8b, glide of a perfect dislocation with a Burgers vector 1 3 〈112 � 0〉 on the basal plane creates no stacking fault since a full translation of the lattice is created.…”

Section: Resultssupporting

confidence: 60%

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On the structure of defects in the Fe7Mo6 μ-Phase

et al. 2019

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Topologically close packed phases, among them the µ-phase studied here, are commonly considered as being hard and brittle due to their close packed and complex structure. Nanoindentation enables plastic deformation and therefore investigation of the structure of mobile defects in the μ-phase, which, in contrast to grown-in defects, has not been examined yet. High resolution transmission electron microscopy (HR-TEM) performed on samples deformed by nanoindentation revealed stacking faults which are likely induced by plastic deformation. These defects were compared to theoretically possible stacking faults within the µ-phase building blocks, and in particular Laves phase layers. The experimentally observed stacking faults were found resulting from synchroshear assumed to be associated with deformation in the Laves-phase building blocks.

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Section: Resultssupporting

confidence: 60%

“…for HfV2 + Nb/ Ta, Cr2Nb and the MgCu2-Laves phases (C15-type) [25,26,33,34,39]. Using micropillar compression at room temperature, plastic deformation by dislocation slip has been shown for cubic NbCo2 and hexagonal (Fe,Ni)2Nb Laves phases by Korte et al [31] and Takata et al [40].…”

Section: Introductionmentioning

confidence: 95%

On the structure of defects in the Fe7Mo6 μ-Phase

et al. 2019

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“…[2,[21][22][23][24][25][26][27][28][29][30][31][32] A selection of materials thus studied in terms of their plasticity is shown in Fig. 2, while Figs.…”

Section: Investigating Plasticity In Hard Crystalsmentioning

confidence: 99%

“…Among the systems, which have been studied to date by research groups around the globe are Cu-Sn phases (solders), carbides and nitrides, MAX phases, binary nickel and iron aluminides, metallic and silicate glasses, high entropy alloys and quasicrystals, [2,[21][22][23][24][25][26][27][28][29][30][31][32]36,[44][45][46][47][48] see also Fig. 2.…”

Section: Investigating Plasticity In Hard Crystalsmentioning

confidence: 99%

“…Selection of hard crystals tested by microcompression. ZrB 2 , [87] Mo 2 BC, [85] WC, [21] Fe 3 Al, [88] Co 3 (Al,W), [89] CMSX-4, [36] Si, [31] GaAs, [2] InSb, [90] Al 2 O 3 (unpublished), MgO, [25] (Fe,Ni) 2 Nb, [30] (Mg, Al) 2 Ca (courtesy of C. Zehnder), Nb 2 Co, [34] AlN, [91] GaN, [92] doped ZrO 2, [93] LiF, [94] Al 7 Cu 2 Fe, [95] FeZn 13 , [96] Cu 6 Sn 5 , [24] either conventional or high resolution, is easily performed after compression by the site-specific FIB milling and where necessary further thinning of a transparent membrane from the micropillar (see Figs. 3, 4, 6, and 10, for examples).…”

Section: Prospective Articlementioning

confidence: 99%

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Microcompression of brittle and anisotropic crystals: recent advances and current challenges in studying plasticity in hard materials

Korte‐Kerzel

2017

MRS Communications

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Recent years have seen an increased application of small-scale uniaxial testing-microcompression-to the study of plasticity in macroscopically brittle materials. By suppressing fast fracture, new insights into deformation mechanisms of more complex crystals have become available, which had previously been out of reach of experiments. Structurally complex intermetallics, metallic compounds, or oxides are commonly brittle, but in some cases extraordinary, though currently mostly unpredictable, mechanical properties are found. This paper aims to give a survey of current advances, outstanding challenges, and practical considerations in testing such hard, brittle, and anisotropic crystals.While the origin of mechanical strength, toughness, and creep resistance is well studied in most metals, much less is known about the properties of more complex crystal structuresdespite their wide use as reinforcement phases and the undiscovered potential in their sheer number and variability. A major challenge in plasticity research of the next years will therefore be to close this gap in knowledge. Small-scale testing techniques have been demonstrated as a key enabling technique for such studies. Most prominent is microcompression, which helps overcome the fundamental challenge of studying plasticity in materials, which suffer from extreme brittleness in conventional testing. [1,2] Their plastic properties may, at first glance, appear to be of only academic interest: aiming to deduce fundamental relationships of crystal plasticity and structure to enable knowledge-guided search and data mining for new structural materials. However, they are in fact essential to performance at the microstructural scale of many advanced and highly alloyed materials and to understanding the effects of alloying strategies aimed at inducing deformability as baseline or reference information. Investigating plasticity in hard crystalsA deep understanding of plasticity and dislocation motion exists in most metallic crystals and strategies to engineer different aspects, for example by adjustment of the stacking fault energy, have been very successful. [3,4] These are being applied-with great effect-to hexagonal metals [3] which in spite of their closely related atomic packing show strongly anisotropic deformation and are therefore much more difficult to deform at low temperatures. In BCC metals, fundamental aspects of dislocation core structure, stress tensor dependence, and resulting non-Schmid behavior, are also still under investigation. [5,6] However, in all of these materials, the availability of large-grained or single crystals with sufficient purity has scarcely been a problem, nor has the ability to deform such samples under carefully controlled conditions. Suitable investigations by conventional, analytical and high-resolution microscopy techniques have also been carried out whenever new methods have allowed researchers to dive deeper into the physics of their plastic deformation.In intermetallics, ceramics, and compounds we face challeng...

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Determination of the Rate Dependence of Damage Formation in Metallic‐Intermetallic Mg–Al–Ca Composites at Elevated Temperature using Panoramic Image Analysis

Medghalchi,

Zubair,

Karimi

et al. 2023

Adv Eng Mater

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We study a cast Mg‐4.65Al‐2.82Ca alloy with a microstructure containing an α‐Mg matrix, reinforced with a C36 Laves phase skeleton. Such ternary alloys are targeted for elevated temperature applications in automotive engines, since they possess excellent creep properties. However, in application, the alloy may be subjected to a wide range of strain rates, and thus accelerated testing is often essential. It is, therefore, crucial to understand the effect of such rate variations. Here, we focus on their impact on damage formation. Our analysis is based on high resolution panoramic imaging using scanning electron microscopy, combined with automated damage analysis using deep learning for object detection and classification (YOLOv5). We find, that with decreasing strain rate the dominant damage mechanism for a given strain level changes: at a strain rate of 5•10‐4/s, the evolution of microcracks in the C36 Laves phase dominates damage formation. However, when the strain rate is decreased to 5•10‐6/s, interface decohesion at the α‐Mg/Laves phase interfaces becomes equally important. We also observe a change in crack orientation, indicating an increasing influence of plastic co‐deformation of the α‐Mg matrix and Laves phase. We attribute this transition in the leading damage mechanism to thermally activated processes at the interface.This article is protected by copyright. All rights reserved.

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Plastic deformation of the C14 Laves phase (Fe,Ni)2Nb

Cited by 52 publications

References 22 publications

On the structure of defects in the Fe7Mo6 μ-Phase

On the structure of defects in the Fe7Mo6 μ-Phase

Microcompression of brittle and anisotropic crystals: recent advances and current challenges in studying plasticity in hard materials

Determination of the Rate Dependence of Damage Formation in Metallic‐Intermetallic Mg–Al–Ca Composites at Elevated Temperature using Panoramic Image Analysis

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