deformation induced nanoscale high temperature phase
Deformation (engineering)Wikipedia
Where ′ is constant related to the material flow stress. ˙ indicates the derivative of strain by the time which is also known as strain rate. is the strain-rate sensitivity. Moreover value of is related to the resistance toward the necking. Usually the value of is at the range of 0-0.1 at room temperature and as high as 0.8 when the temperature is increased. . By combining the 1) and 2
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High-density deformation nanotwin induced significant
High-density deformation nanotwin induced significant improvement in the plasticity of polycrystalline γ-TiAl-based intermetallic alloys† Shiqiu Liu a Hongsheng Ding a Hailong Zhang a Ruirun Chen a Jingjie Guo a and Hengzhi Fu a
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(PDF) Orientation-dependent plastic deformation mechanisms
Introduction a martensitic phase transformation from the high-temperature cubic B2 austenite phase to a low-temperature monoclinic B19 Shape-memory alloys (SMAs) are characterized by reversible martensite phase. temperature- and stress-induced phase transformations allowing Recently the application of SMAs to micro- and nano- them to restore
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NanofiberWikipedia
This deformation later came to be known as the Taylor cone. In 1882 Thermal-induced phase separation separates a homogenous polymer solution into a multi-phase system via thermodynamic low gelation temperature results in formation of nanoscale fiber networks while high gelation temperature leads to the formation of a platelet-like
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Phase‐field‐crystal study on deformation behavior of
May 22 2019 · Phase‐field‐crystal method is applied to study deformation behavior in the ductile‐to‐brittle transition region of the nanoscale monocrack system in this work. The influence of temperature crystal orientation angle and crack shape on the deformation behavior is investigated.
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Extreme shear-deformation-induced modification of defect
Nov 12 2020 · Solid-phase processing (SPP) methods such as friction stir processing (FSP) 1 and shear-assisted processing and extrusion 2 employ extreme shear deformation to achieve highly refined
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Nanoscale Deformation Behavior of Phase-Reversion Induced
The concept of phase reversion involves severe cold deformation of metastable austenite to generate strain-induced martensite. Upon annealing martensite transforms back to austenite through a diffusional reversion mechanism with NG/UFG sub-micron grains (SMG) or FG structure depending on the annealing condition.
Get PriceCorrosion Behavior of Severely Deformed Pure and Single
Corrosion Behavior of Severely Deformed Pure and Single-Phase Materials Hiroyuki Miyamoto 1 Motohiro Yuasa Muhammad Rifai2 and Hiroshi Fujiwara3 1Department of Mechanical Engineering Doshisha University Kyotanabe Japan 2Center for Science and Technology of Advanced Materials National Nuclear Energy Agency Batan Indonesia 3Department of Mechanical
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High-density deformation nanotwin induced significant
High-density deformation nanotwin induced significant improvement in the plasticity of polycrystalline γ-TiAl-based intermetallic alloys† Shiqiu Liu a Hongsheng Ding a Hailong Zhang a Ruirun Chen a Jingjie Guo a and Hengzhi Fu a
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Characterization of high temperature deformation behavior
High temperature deformation behavior of Alloy 617 has been investigated as a function of strain rate ranging from 10(exp-3) to 10(exp-6) s(exp-1) at 600 and 800 deg C. Increase in the temperature and decrease in the strain rate decreased the flow stress of the material.
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Atomic-scale segregations at the deformation-induced
Full length article Atomic-scale segregations at the deformation-induced symmetrical boundary in an Mg-Zn-Y alloy X.H. Shao a Z.Z. Peng a Q.Q. Jin a b X.L. Ma a a Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China b School of Materials Science and Technology University of Science and Technology of China
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Nanoscale Deformation Behavior of Phase-Reversion Induced
The phase-reversion induced NG/UFG structure was characterized by high strength-high ductility combination. The concept of phase reversion involves severe cold deformation of metastable austenite to generate strain-induced martensite. Somani M.C. et al. Nanoscale Deformation Behavior of Phase-Reversion Induced Austenitic Stainless Steels
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New Deformation-Induced Nanostructure in Silicon Nano
Nanostructures in silicon (Si) induced by phase transformations have been investigated during the past 50 years. Performances of nanostructures are improved compared to that of bulk counterparts. Nevertheless the confinement and loading conditions are insufficient to machine and fabricate high-performance devices. As a consequence nanostructures fabricated by nanoscale deformation at
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Nanoscale stacking fault–assisted room temperature
Consequently the deformation behavior of the flash-sintered TiO 2 at RT is dominated by the stress-induced nanoscale stacking faults that propagate slowly and thus the corresponding stress-strain curves are continuous with few and small serrations while the sharp load-drops at 400°C are caused by the formation and rapid propagation of
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Deformation-induced ambient temperature a-to- transition
Deformation-induced ambient temperature a-to-b phase transition and nanocrystallization in (a b) titanium alloy centered cubic (bcc b) phase at high temperature. At high pressure and ambient temperature titanium under- composition across the nanoscale region. 26 To understand the thermal stability of the SMATed TLM the specimens
Get PriceQuantitative Profiling of Nanoscale Liposome Deformation
Characterizing the shape of sub-100 nm biological soft-matter particulates (e.g. liposomes and exosomes) adsorbed at a solid-liquid interface remains a challenging task. Here we introduce a localized surface plasmon resonance (LSPR) sensing approach to quantitatively profile the deformation of nanoscale fluid-phase 1 2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) liposomes
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Deformation-induced ambient temperature a-to- transition
Deformation-induced ambient temperature a-to-b phase transition and nanocrystallization in (a b) titanium alloy centered cubic (bcc b) phase at high temperature. At high pressure and ambient temperature titanium under- composition across the nanoscale region. 26 To understand the thermal stability of the SMATed TLM the specimens
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NANO LETTERS Stress-Induced Martensitic Phase
The phase transformation occurs across a wide range of deformation temperatures and results in fracture strains approaching the theoretically predicted maximum for an initially B2 lattice.17The ductility of the NiAl nanowires is illustrated by the fact that the recoverable inelastic tensile strain is on the order of 40 thus greatly outperforming both bulk NiAl16as well as commonly used shape memory alloys (SMAs)
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High-pressure torsion-induced phase transformations and
Jul 07 2017 · High-pressure torsion (HPT) deformation of multiphase metallic systems produces a high density of interfaces and leads to atomic mixing between the constituent phases. Here we present a study of the interphase boundary structure grain size evolution and intermetallic phase formation during HPT deformation of a nano-crystalline Al/Ti composite.
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Nanoscale stacking fault–assisted room temperature
Consequently the deformation behavior of the flash-sintered TiO 2 at RT is dominated by the stress-induced nanoscale stacking faults that propagate slowly and thus the corresponding stress-strain curves are continuous with few and small serrations while the sharp load-drops at 400°C are caused by the formation and rapid propagation of
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(PDF) Orientation-dependent plastic deformation mechanisms
Introduction a martensitic phase transformation from the high-temperature cubic B2 austenite phase to a low-temperature monoclinic B19 Shape-memory alloys (SMAs) are characterized by reversible martensite phase. temperature- and stress-induced phase transformations allowing Recently the application of SMAs to micro- and nano- them to restore
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Deformation Mechanisms Microstructure Evolution and
A Phase-Field—Finite Element Model for Instabilities Nanoscale deformation of MEMS materials . . ..95 A.J. Lockwood A. Padmanabhan high- and low-temperature deformation mechanisms and mechanical property characterization of materials as well as recent advances in atomistic
Get PriceTemperature-dependent mechanical deformation of
Temperature dependent deformation mechanisms in pure amorphous silicon J. Appl. Phys. 115 113511 (2014) 10.1063/1. Deformation mechanisms in silicon nanoparticles J. Appl. Phys. 109 063534 (2011) 10.1063/1. Effect of hydrogen on nanoindentation-induced phase transformations in amorphous silicon
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Nanoscale evidence for temperature-induced transient
The nanometer-high polygonal ridge network indicates hematite crystals grew into one another and interlocked across the FM surface which likely formed in the core of the FM volume. Growth of nanoscale crystals sintering and twinning are strain hardening (Lu et al. 2005 Luding and Suiker 2008). These transformations combined with
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Nanomaterials Free Full-Text Reveal the Deformation
The HPPT from Si-I to bct5 initiates at the indentation strain of 0.058 0.053 and 0.051 at 0.5 K 300 K and 573 K respectively. This transformation means the onset of plastic deformation. The high-pressure phase Si-II is first visible at the indentation strain of 0.069 0.067
Get PriceRoom temperature deformation mechanisms of Mg/Nb
In this work the deformation mechanisms underlying the room temperature deformation of the pseudomorphic body centered cubic (BCC) Mg phase in Mg/Nb nanolayered composites are studied. Nanolayered composites comprised of 50 volume fraction of Mg and Nb were synthesized using physical vapor deposition with the individual layer thicknesses h of
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Deformation-induced nanoscale high-temperature phase
Deformation-induced nanoscale high-temperature phase separation in Co–Fe alloys at room temperature. Lai-Chang Zhang. a. IFW Dresden Institut für Komplexe Materialien Postfach 27 01 16 D-01171 Dresden Germany. Mariana Calin. IFW Dresden Institut für Komplexe Materialien Postfach 27 01 16 D-01171 Dresden Germany and
Get PriceDeformation-induced nanoscale high-temperature phase
May 15 2007 · Instead of applying severe plastic deformation high-temperature heat treatment or high pressure grain refinement and high-temperature phase separation induced by deformation in single-phase body-centered-cubic (bcc) coarse-grained Co–Fe alloys have been achieved by simple room-temperature compression. The alloys exhibit large plasticity over 140 without fracture.
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High-pressure torsion-induced phase transformations and
Jul 07 2017 · High-pressure torsion (HPT) deformation of multiphase metallic systems produces a high density of interfaces and leads to atomic mixing between the constituent phases. Here we present a study of the interphase boundary structure grain size evolution and intermetallic phase formation during HPT deformation of a nano-crystalline Al/Ti composite.
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