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article

Powder metallurgy processing and deformation characteristics of bulk multimodal nickel

L. Farbaniec, G. Dirras, A. Krawczynska, F. Mompiou, more

Materials Characterization > 2014 > 94 > Complete > 126-137

Spark plasma sintering was used to process bulk nickel samples from a blend of three powder types. The resulting multimodal microstructure was made of coarse (average size ~135μm) spherical microcrystalline entities (the core) surrounded by a fine-grained matrix (average grain size ~1.5μm) or a thick rim (the shell) distinguishable from the matrix. Tensile tests revealed yield strength of ~470MPa...

article

Microstructural and thermal property evolution of reaction bonded silicon carbide (RBSC)

Yuying Zhang, Chun-Yen Hsu, Steven Aubuchon, Prashant Karandikar, more

Journal of Alloys and Compounds > 2018 > 764 > C > 107-111

Temperature dependent thermal conductivity of reaction bonded silicon carbide (RBSC) from 300 K to 1073 K is evaluated. The thermal conductivity of 80 vol% and 90 vol% SiC RBSC is measured to be 185.7 W/m·K and 211.4 W/m·K at room temperature and decreases to 51.46 W/m·K and 55.77 W/m·K at 1073 K, respectively. Thermal transport behavior of RBSC at elevated temperatures suggests that a structural...

article

In-situ TEM observation of {101¯2} twin-dominated deformation of Mg pillars: Twinning mechanism, size effects and rate dependency

Jiwon Jeong, Markus Alfreider, Ruth Konetschnik, Daniel Kiener, more

Acta Materialia > 2018 > 158 > C > 407-421

To investigate the mechanism of {101¯2} twinning in magnesium (Mg) single crystal and its influence on mechanical size effects and strain rate dependent deformation behavior, in-situ microcompression of Mg [21¯1¯0] pillars of various sizes from 0.5 μm to 4 μm was carried out in a scanning electron microscope (SEM) and also in a transmission electron microscope (TEM), covering strain rates from 10⁻⁴...

article

In-situ TEM observation of hcp-Ti to fcc-Ti phase transformation in Nb-Ti-Si based alloys

Xiao Ma, Xiping Guo, Maosen Fu, Yanqiang Qiao

Materials Characterization > 2018 > 142 > C > 332-339

Phase transformation process of interfacial Ti precipitates in Nb-Ti-Si based alloys is systematically investigated by in-situ transmission electron microscopy (TEM) observation. The Ti precipitates exhibit an uncommon face-centered cubic (fcc) structure, which can be identified by analyzing its chemical composition and phase transformation characteristics. Fcc-Ti precipitates precipitate from Nbss...

article

Multiple phase transitions and structural oscillations in thermoelectric Cu2S at elevating temperatures

Jialin Duan, Chenxi Zhu, Mengjia Guan, Ping Lu, more

Ceramics International > 2018 > 44 > 11 > 13076- 13081

The intrinsic ultra-low lattice thermal conductivity (κ_L) of high performance thermoelectric Cu₂S may arise from its multiform complex crystal structures while the further sharp drop of κ_L observed at elevating temperatures close to the phase transition to hexagonal high-chalcocite is of considerable interest. In this work, in-depth in-situ transmission electron microscopy investigations have been...

article

Influence of chemical bonding on the variability of diamond-like carbon nanoscale adhesion

Rodrigo A. Bernal, Polun Chen, J. David Schall, Judith A. Harrison, more

Carbon > 2018 > 128 > C > 267-276

Diamond-like-carbon (DLC) is a promising material for tribological applications such as hard disk, automotive, machine tool, and aerospace coatings. We performed in-situ transmission electron microscopy (TEM) and molecular dynamics (MD) studies of nanoscale single-asperities made of tetrahedral amorphous carbon (ta-C, a type of DLC with high strength) contacting single-crystal diamond, to understand...

article

In-situ TEM study of dislocation emission associated with austenite growth

Juan Du, Frédéric Mompiou, Wen-Zheng Zhang

Scripta Materialia > 2018 > 145 > C > 62-66

The emission of dislocations from the tip of a newly transformed austenite lath, with a near Pitsch orientation relationship with the ferrite matrix, was observed at 760°C in a duplex stainless steel, using in-situ transmission electron microscopy. The dynamics of dislocation loops with [111]_b/2 Burgers vector were carefully analyzed. An estimation of stress concentration at the tip was made using...

article

Current density effects on the microstructure of zirconium thin films

Zahabul Islam, Baoming Wang, Aman Haque

Scripta Materialia > 2018 > 144 > C > 18-21

We investigate the effect of electrical current density below the electromigration failure limit in nanocrystalline zirconium thin films using in-situ Transmission Electron Microscope and molecular dynamics simulation. At least one order of magnitude higher growth was seen at current density of 8.5×10⁵A/cm² (Joule heating temperature 710K) in 15min compared to conventional thermal annealing at 873K...

article

In-situ study of phase transformations during homogenization of 6005 and 6082 Al alloys

N. Bayat, T. Carlberg, M. Cieslar

Journal of Alloys and Compounds > 2017 > 725 > C > 504-509

Intermetallic β-Al₅FeSi phase and coarse Mg₂Si particles have negative effects on extrudability and workability of 6xxx Al alloy billets. To achieve extruded products with a high surface quality as-cast billets are therefore heat-treated before extrusion. During heat treatment the undesired intermetallic particles, i.e., β-AlFeSi platelets, are transformed to a rounded α-Al(FeMn)Si intermetallic phase...

article

In-situ TEM investigation of MoS₂ upon alkali metal intercalation

Qianming Huang, Lifen Wang, Zhi Xu, Wenlong Wang, more

Science China Chemistry > 2018 > 61 > 2 > 222-227

Phase transition in two dimensional molybdenum disulfide (MoS₂) can be induced by several methods and has been investigated for decades. Alkali metal insertion of MoS₂ had been proved an effective method to cause phase transition early in 1970s, and has been gaining renewed interest recently, due to the possible application of MoS₂ in energy storage. The alkali metal intercalation of MoS₂ has been...

article

Multistep superelasticity of Ni-Mn-Ga and Ni-Mn-Ga-Co-Cu microwires under stress-temperature coupling

Zhiyi Ding, Dexing Liu, Qingli Qi, Jianxing Zhang, more

Acta Materialia > 2017 > 140 > C > 326-336

Martensitic and intermartensitic transformation induced by changing temperature and/or applying mechanical stress was investigated systematically in Ni₅₀Mn₃₀Ga₂₀ and Ni₄₆Mn₂₄Ga₂₂Co₄Cu₄ polycrystalline shape memory microwire. In particular, intermartensitic transformation induced by stress can be obtained in single crystal but difficult in polycrystalline materials that are usually intrinsically brittle...

article

In-situ tracking the structural and chemical evolution of nanostructured CuCr alloys

Zaoli Zhang, Jinming Guo, Gerhard Dehm, Reinhard Pippan

Acta Materialia > 2017 > 138 > C > 42-51

We report the thermal stability of supersaturated CuCr nanocrystallines alloys at the atomic resolution using modern spherical aberration-corrected transmission electron microscopy (TEM) via performing in-situ structural and spectroscopy experiments. It is found that CuCr nanocrystallines are not only subjected to a structural change but also undergo a chemical evolution upon annealing. Chemical destabilization...

article

Liquid-solid phase transition of Ge-Sb-Te alloy observed by in-situ transmission electron microscopy

Katja Berlin, Achim Trampert

Ultramicroscopy > 2017 > 178 > C > 27-32

Melting and crystallization dynamics of the multi-component Ge-Sb-Te alloy have been investigated by in-situ transmission electron microscopy (TEM). Starting point of the phase transition study is an ordered hexagonal Ge₁Sb₂Te₄ thin film on Si(111) where the crystal structure and the chemical composition are verified by scanning TEM and electron energy-loss spectroscopy, respectively. The in-situ...

article

Influence of laser shock peening on irradiation defects in austenitic stainless steels

Qiaofeng Lu, Qing Su, Fei Wang, Chenfei Zhang, more

Journal of Nuclear Materials > 2017 > 489 > C > 203-210

The laser shock peening process can generate a dislocation network, stacking faults, and deformation twins in the near surface of austenitic stainless steels by the interaction of laser-driven shock waves with metals. In-situ transmission electron microscopy (TEM) irradiation studies suggest that these dislocations and incoherent twin boundaries can serve as effective sinks for the annihilation of...

article

Multislice simulations for in-situ HRTEM studies of nanostructured magnesium hydride at ambient hydrogen pressure

Alexander Surrey, Ludwig Schultz, Bernd Rellinghaus

Ultramicroscopy > 2017 > 175 > C > 111-115

The use of transmission electron microscopy (TEM) for the structural characterization of many nanostructured hydrides, which are relevant for solid state hydrogen storage, is hindered due to a rapid decomposition of the specimen upon irradiation with the electron beam. Environmental TEM allows to stabilize the hydrides by applying a hydrogen back pressure of up to 4.5 bar in a windowed environmental...

article

In-situ TEM observation of Multilevel Storage Behavior in low power FeRAM device

Chung-Hua Chiu, Chun-Wei Huang, Ying-Hui Hsieh, Jui-Yuan Chen, more

Nano Energy > 2017 > 34 > C > 103-110

The quest for non-volatile memories has attracted tremendous attention, especially in mature ferroelectric random access memory (FeRAM) with properties of high read/write speed and low power consumption. Strain engineering of multiferroic BiFeO₃ (BFO) has recently become the subject of broad research interest because of its intriguing properties. In this study, we demonstrate the switchable diode...

article

Influence of deformation microstructure on the precipitation behaviors of an Al-4Mg-0.3Cu alloy

Xiaohui Yang, Kai Li, Xianghai An, Song Ni, more

Journal of Alloys and Compounds > 2017 > 695 > C > 2238-2245

To provide insight into the effect of deformation microstructure on the precipitation behavior, an Al-4Mg-0.3Cu alloy was processed by high-pressure torsion followed by subsequent in-situ heating in a transmission electron microscope. Structural characterization revealed significant differences in the size, composition and spatial distribution of the precipitates in the alloy subjected to different...

article

Liquid cell transmission electron microscopy observation of lithium metal growth and dissolution: Root growth, dead lithium and lithium flotsams

Akihiro Kushima, Kang Pyo So, Cong Su, Peng Bai, more

Nano Energy > 2017 > 32 > C > 271-279

We present in situ environmental transmission electron microscopy (ETEM) observation of metallic lithium nucleation, growth and shrinkage in a liquid confining cell, where protrusions are seen to grow from their roots or surfaces, depending on the overpotential. The rate of solid-electrolyte interface (SEI) formation affects root vs. surface growth mode, with the former akin to intermittent volcanic...

article

Short Communication on “In-situ TEM ion irradiation investigations on U3Si2 at LWR temperatures”

Yinbin Miao, Jason Harp, Kun Mo, Sumit Bhattacharya, more

Journal of Nuclear Materials > 2017 > 484 > C > 168-173

The radiation-induced amorphization of U₃Si₂ was investigated by in-situ transmission electron microscopy using 1 MeV Kr ion irradiation. Both arc-melted and sintered U₃Si₂ specimens were irradiated at room temperature to confirm the similarity in their responses to radiation. The sintered specimens were then irradiated at 350 °C and 550 °C up to 7.2 × 10¹⁵ ions/cm² to examine their amorphization...

article

Mechanical behavior of copper containing a gas-bubble superlattice

Zhang-Jie Wang, Frances I. Allen, Zhi-Wei Shan, Peter Hosemann

Acta Materialia > 2016 > 121 > C > 78-84

Helium implantation can cause the formation of a helium gas-bubble superlattice in crystalline materials. Experimental studies of the mechanical response of a material hosting such a superlattice are lacking, especially at the microstructural level. By employing a novel, high-throughput, high-precision nanoscale helium implantation technique, in combination with in-situ transmission electron microscopy...

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Powder metallurgy processing and deformation characteristics of bulk multimodal nickel

Microstructural and thermal property evolution of reaction bonded silicon carbide (RBSC)

In-situ TEM observation of {101¯2} twin-dominated deformation of Mg pillars: Twinning mechanism, size effects and rate dependency

In-situ TEM observation of hcp-Ti to fcc-Ti phase transformation in Nb-Ti-Si based alloys

Multiple phase transitions and structural oscillations in thermoelectric Cu2S at elevating temperatures

Influence of chemical bonding on the variability of diamond-like carbon nanoscale adhesion

In-situ TEM study of dislocation emission associated with austenite growth

Current density effects on the microstructure of zirconium thin films

In-situ study of phase transformations during homogenization of 6005 and 6082 Al alloys

In-situ TEM investigation of MoS₂ upon alkali metal intercalation

Multistep superelasticity of Ni-Mn-Ga and Ni-Mn-Ga-Co-Cu microwires under stress-temperature coupling

In-situ tracking the structural and chemical evolution of nanostructured CuCr alloys

Liquid-solid phase transition of Ge-Sb-Te alloy observed by in-situ transmission electron microscopy

Influence of laser shock peening on irradiation defects in austenitic stainless steels

Multislice simulations for in-situ HRTEM studies of nanostructured magnesium hydride at ambient hydrogen pressure

In-situ TEM observation of Multilevel Storage Behavior in low power FeRAM device

Influence of deformation microstructure on the precipitation behaviors of an Al-4Mg-0.3Cu alloy

Liquid cell transmission electron microscopy observation of lithium metal growth and dissolution: Root growth, dead lithium and lithium flotsams

Short Communication on “In-situ TEM ion irradiation investigations on U3Si2 at LWR temperatures”

Mechanical behavior of copper containing a gas-bubble superlattice

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