Microstructural Stability of Nanostructured Fcc Metals During Cyclic Deformation and Fatigue PDF Download
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Author: Matthias Friedrich Funk
Publisher: KIT Scientific Publishing
ISBN: 3866449186
Category : Technology & Engineering
Languages : en
Pages : 218
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Book Description
Nanostructured metals with maximal grain or twin sizes of less than 100 nm have advanced properties like increased strength.As beneficial as these microstructures can be for the strength of materials, they are not infinitely stable. During mechanical loading these metals tend to coarsen and lose their beneficial structure. Besides electron microscopic analysis of fatigued samples, in situ cycling tests were conducted in order to observe structural degradation during mechanical loading.
Author: Matthias Friedrich Funk
Publisher: KIT Scientific Publishing
ISBN: 3866449186
Category : Technology & Engineering
Languages : en
Pages : 218
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Book Description
Nanostructured metals with maximal grain or twin sizes of less than 100 nm have advanced properties like increased strength.As beneficial as these microstructures can be for the strength of materials, they are not infinitely stable. During mechanical loading these metals tend to coarsen and lose their beneficial structure. Besides electron microscopic analysis of fatigued samples, in situ cycling tests were conducted in order to observe structural degradation during mechanical loading.
Author: Eslami, Reza
Publisher: KIT Scientific Publishing
ISBN: 3731505835
Category : Technology (General)
Languages : en
Pages : 142
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Book Description
The grain microstructure and damage mechanisms at the grain level are the key factors that influence fatigue of metals at small scales. This is addressed in this work by establishing a new micro-mechanical model for prediction of multiaxial high cycle fatigue (HCF) at a length scale of 5-100?m. The HCF model considers elasto-plastic behavior of metals at the grain level and microstructural parameters, specifically the grain size and the grain orientation.
Author: Sofie Burger
Publisher: KIT Scientific Publishing
ISBN: 3731500256
Category : Technology & Engineering
Languages : en
Pages : 172
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Book Description
In the last two decades, the reliability of small electronic devices used in automotive or consumer electronics gained researchers attention. Thus, there is the need to understand the fatigue properties and damage mechanisms of thin films. In this thesis a novel high-throughput testing method for thin films on Si substrate is presented. The specialty of this method is to test one sample at different strain amplitudes at the same time and measure an entire lifetime curve with only one experiment.
Author: Ankit, Kumar
Publisher: KIT Scientific Publishing
ISBN: 373150491X
Category : Technology (General)
Languages : en
Pages : 240
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Book Description
With the advent of high performance computing, the application areas of the phase-field method, traditionally used to numerically model the phase transformation in metals and alloys, have now spanned into geoscience. A systematic investigation of the two distinct scientific problems in consideration suggest a strong influence of interfacial energy on the natural and induced pattern formation in diffusion-controlled regime.
Author: Syha, Melanie
Publisher: KIT Scientific Publishing
ISBN: 3731502429
Category : Science
Languages : en
Pages : 178
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Book Description
Understanding the physical processes during fabrication and annealing of ceramic materials is a long sought goal among material scientists. Using strontium titanate as a model system for perovskite ceramics, the present work combines advanced non-destructive 3D characterization techniques and computational modeling of microstructure evolution in order to link grain morphology, interface anisotropy and microstructure evolution to macroscopic physical properties .
Author: Simone Schreijäg
Publisher: KIT Scientific Publishing
ISBN: 3866449674
Category : Technology & Engineering
Languages : en
Pages : 188
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Book Description
The deformation behavior of steels is strongly influenced by their microstructure which is a result of the alloying elements and thermal treatments. In this work, the microstructure and the deformation behavior of a non-alloyed deep drawing DC04 steel was investigated. The microstructure was analyzed during heat treatment by EBSD, then microcompression experiments were performed on selected microstructural units and then bulk steel samples were mechanically tested by tensile experiments.
Author: Kennerknecht, Tobias
Publisher: KIT Scientific Publishing
ISBN: 3731502933
Category : Technology (General)
Languages : en
Pages : 284
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Book Description
Custom built setups were developed to investigate micro samples during quasistatic and cyclic testing in tension, compression and bending. Micro molded CuAl10Ni5Fe4-samples showed similar fatigue behavior compared to macroscopic samples due to both the sample size and microstructure being scaled down with the manufacturing process. Results from cyclic three-point bending tests on micro molded 3Y-TZP suggested that a minimum crack extension is necessary to develop cyclically degradable shielding.
Author: Jochen Andreas Lohmiller
Publisher: KIT Scientific Publishing
ISBN: 3866449623
Category : Technology & Engineering
Languages : en
Pages : 250
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Book Description
In this work, different nanocrystalline metals and alloys were investigated by a synchrotron-based in situ XRD mechanical testing technique in order to investigate the dominant deformation mechanisms. All tested samples show a succession and coexistence of several mechanisms, regardless of grain size, loading condition, or sample geometry. However, the relative shares of the individual mechanisms strongly vary and depend on parameters such as grain size, sample purity, and alloy composition.
Author: Straub, Thomas
Publisher: KIT Scientific Publishing
ISBN: 3731504715
Category : Technology (General)
Languages : en
Pages : 234
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Book Description
This book investigates the fatigue mechanisms and crack initiation of Ni, Al and Cu on a small-scale in the Very High Cycle Fatigue regime by means of innovative fatigue experimentation. A novel custom-built resonant fatigue setup showed that the sample resonant frequency changes with increasing cycle number due to fatigue damage. Mechanisms such as slip band formation have been observed. Cyclic hardening, vacancy and oxidation formation may be considered as early fatigue mechanisms.
Author: Zhiming Chen
Publisher: KIT Scientific Publishing
ISBN: 3866449682
Category : Technology & Engineering
Languages : en
Pages : 174
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Book Description
The 1/2111 screw dislocations in bcc iron are studied by atomistic simulations. An analytical yield criterion captures correctly the non-Schmid plastic behavior. A model Peierls potential develops a link between the atomistic modeling at 0 K and the thermally activated dislocation motion. All predicted features agree well with experimental observations. This work establishes a consistent bottom-up model that provides an insight into the microscopic origins of the plastic behavior of bcc iron.
